Intake heater light on freightliner

My grid heater is not firing up on my 6.7. It is in the single digits at night and no where near the 55 or 60 F function point. I checked the power to the main solonoid that controls power to the grid and I also manually fired the solonoid and varified that it is working. The problem seems to be that the ECM is not giving a command to activate ...

20–03 Coolant Heater Check, Webasto Inspect the coolant heater every 12 months. 00 General Information Vehicle Maintenance Schedule Table: 00–02 00/2 Walk-In Van Chassis Maintenance Manual, May 2022The grid heaters on our Vision's here will continue to cycle causing the volt gauge to drop, the STOP light and TOO LOW with pic of battery, until the engine oil temp and the engine water temp reach 120 degrees cumulatively. So basically 60 degrees of temp on each one is suppose to stop grid heater from coming on.My question is about the air intake heater system on my 2000 Freightliner FL70 that has a Cat 3126 engine. I have had the truck since March of this year. Initially the indicator light for warming the engine when cold stayed on for about 30 seconds as it. was supposed to and the engine started fine. I have a lengthy bit of info I want to include ...I have a 2004 FREIGHTLINER M2-16 with a DT 466 Diesel engine. While driving it it runs fine but at decceleration at almost full stop, it starts shaking and acting up and the intake heater light comes … read moreWe have had numerous inake heater relays fail on 3116/3126 engines. The C7 engines use a heavier relay. The earlier relays are to small to carry the 90+ amp load. On the 3116/3126 engines we have been using the Blue Bird relay that is used for the body heater/light functions. It does require replacing the terminal ends with something much …The heater will stay on for a few minutes, It is there to help starting and reduce smoke during warmup.i haven't worked on cats in a few years but i think the heater can stay on for up to 5 minutes in extremely cold environments. and yes they will draw voltage down .On our Freightliner m2 trucks with cummins engines,the intake heater will cycle ...2) The intake air heater circuits will only activate when the intake manifold temperature is below 19°C [66°F] when the key switch is in the ON position. Ask Your Own Medium and Heavy Trucks Question. Voltmeter on dash Drops down every time the relay cycle When cold I turn the key on I hear the relays energize and the wait to start light ...

Click the link above for the information. Ask Your Own Medium and Heavy Trucks Question. There’s a relay on top of the intake heater where power comes to but it isn’t sending power out the other side. Technician: Nich M. The relay should be activates by the ECM. Ask Your Own Medium and Heavy Trucks Question.Click the link above for the information. Ask Your Own Medium and Heavy Trucks Question. There’s a relay on top of the intake heater where power comes to but it isn’t sending power out the other side. Technician: Nich M. The relay should be activates by the ECM. Ask Your Own Medium and Heavy Trucks Question.open a can of worms. essentially there have been. a few cases of the grid heater bolt breaking off and finding a home pounded into the top of cylinder 6. the belief is the bolt loosens and electrical current arcs causing it to fall off, or constant elec current arcs causing it to fall into intake.Since I haven't been getting the glow plugs light on the dash when I turn the key. I replaced the glow plug relay, no luck. ... S&B Intake 6/18 Water Pump / Radiator 6/18 Pillar Gauges 6/18 PMD relocated to bumper 12/12 ... -Webasto Diesel Coolant Heater w/Remote Start -Remote PMD on Heat Sync in bumper, HID Headlights w/new lensesTo contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. Vehicles domiciled in Canada thought to have a defect that could cause a crash, injury, or death, should immediately be reported to Transport Canada and Daimler Truck North America …

Instructions for Westek timers are available online at AmerTac.com and WaterHeaterTimer.org. American Tack and Hardware Co. manufactures and distributes Westek timers for use in ap...%PDF-1.4 %âãÏÓ 4520 0 obj > endobj xref 4520 25 0000000016 00000 n 0000003330 00000 n 0000003476 00000 n 0000003514 00000 n 0000003737 00000 n 0000003880 00000 n 0000004524 00000 n 0000005195 00000 n 0000005234 00000 n 0000005313 00000 n 0000005390 00000 n 0000005563 00000 n 0000006101 00000 n 0000006758 …To contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. To contact Transport Canada, call the Defect In- ... 6 Heater, Ventilator and Air Conditioner .....6.1 7 …Mar 21, 2010. #1. Recently I disconnected my battery cables, pulled the speedometer out to look for something else and now my check engine light and engine heater light won't go out and the code it flashes is 49 which is "Inlet Air Heater Driver Fault" (open/closed circuit) or something like that. I called CAT and he said it could be anything ... FREIGHTLINER M2 Heater Assembly. OEM #: A22-59312-000. SURPLUS RED DOT AUXILARY HVAC A/C HEATER ASSEMBLY FLOOR MOUNTED P/N: A22-59312-000 REPLACED BY P/N: RDH R4225 1. Create Estimate. Part Info. (541)922-6455 Request Info Enterprise Hagerman Inc. UMATILLA OR. $600.00. banyon. If the grid heater was on you would see the draw on the amp meter. Keep a test light in the truck with you & when it comes on see if the grid solenoid is getting power. It should have power to one side but not to the grid itself. The intake air sensor is the one at the air cleaner.

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The Saf-T-Liner C2’s Cummins engine is equipped with a grid heater inside its air system. This grid heater takes a few seconds to heat up and has three purposes: Assists the engine’s cold weather start-ability by preheating the intake air. Helps control white smoke during cold starting (reduced hydrocarbon emissions – EPA requirement)Gasoline engines use an intake manifold to deliver a fuel and air mixture to each cylinder for combustion. Intake manifolds once were made of cast iron. The biggest problem with ca...Nov 6, 2011. #4. Yes, when you turn the key to the run position the gauges will sweep from the lowest values to the highest and the solenoids in the air valves will do a "chuff" test. Then the gauges will go to the positons for the conditions present when the engine is off. I'm not sure of the 5.9 Cummins engine has an intake manifold grid ...FREIGHTLINER M2 Heater Assembly. OEM #: A22-59312-000. SURPLUS RED DOT AUXILARY HVAC A/C HEATER ASSEMBLY FLOOR MOUNTED P/N: A22-59312-000 REPLACED BY P/N: RDH R4225 1. Create Estimate. Part Info. (541)922-6455 Request Info Enterprise Hagerman Inc. UMATILLA OR. $600.00.

The heater core in the Chevy Astro van acts like a small radiator that the engine coolant passes through. If the van's heater has trouble working, you may need to replace the core....Follow procedure 006-075. when the Water-In-Fuel (WIF) sensor is activated. by pouring fuel in the center hole (clean side). Recommended procedure is to install filter dry and turn the key switch on and off 3-4 times and allow the priming pump to fill the filter. If you have to pre-fill the filter, use the smaller outside holes.09 Air Intake . 09–01 Air Cleaner Element Inspection and Replacement ; 13 Air Compressor . 13–00 Safety Precautions ; 13–01 Air Compressor Inspection ; 15 Alternators and Starters . 15–00 Safety Precautions ; 15–01 Alternator, Battery, and Starter Connections Check ; 20 Engine Cooling/Radiator . 20–00 Safety Precautions ; 20–01 ...Find the intake air heater and then find the leads to that heater. Disconnect the leads and check for resistance at those leads. You can check Youtube on how to do it. If your intake air heater is not heating up and if there is no voltage drop because of the electrical load that is not placed on the intake air heater then you can potentially ...Page 156 20.05 Fan Clutch, Horton DriveMaster Troubleshooting Troubleshooting Tables Problem—Air Is Leaking from the Fan Clutch Problem—Air Is Leaking from the Fan …NOTE: If the check engine light illuminates dur- sition is left blank. ing vehicle operation, take the vehicle directly to The instrument cluster has an emergency buzzer that an …I love my coffee as much as the next cup (and the one after), but tolerance to its effects can be a real bummer. If you want to feel like you can outrun a cheetah again, try a brie...Senior Member. Join Date: Jul 2016. Posts: 189. ISC 8.3 Heater Grid. My 2004 Revolution has a Cummins ISC 8.3 that will not start in colder weather. If I activate the block/coolant heater for an hour or so it starts fine. This leads me to suspect the grid heater is either not working or not getting power. I removed the bedroom engine access door.Jan 22, 2024 · I have a 2004 FREIGHTLINER M2-16 with a DT 466 Diesel engine. While driving it it runs fine but at decceleration at almost full stop, it starts shaking and acting up and the intake heater light comes … read more

With the results, contact Mercedes-Benz Transmissions Service Support by fax (503.961.8435), email (MBTServiceSupport@ Freightliner.com), or phone (503.745.4965 or 503.745.4988). Table 2, The Battery Voltage Is Too Low 307/4 Business Class M2 Workshop Manual, Supplement 20, September 2011...

FREIGHTLINER M2 Heater Assembly. OEM #: A22-59312-000. SURPLUS RED DOT AUXILARY HVAC A/C HEATER ASSEMBLY FLOOR MOUNTED P/N: A22-59312-000 REPLACED BY P/N: RDH R4225 1. Create Estimate. Part Info. (541)922-6455 Request Info Enterprise Hagerman Inc. UMATILLA OR. $600.00.New Design Old DesignTo contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. Vehicles …Shows the steps to disable those pesky intake heater lights by disabling grid heater. Remember to key off and let bus go to sleep to fully deactivate.usmilret. Find the intake air heater and then find the leads to that heater. Disconnect the leads and check for resistance at those leads. You can check Youtube on how to do it. If your intake air heater is not heating up and if there is no voltage drop because of the electrical load that is not placed on the intake air heater then you can ...2) The intake air heater circuits will only activate when the intake manifold temperature is below 19°C [66°F] when the key switch is in the ON position. Ask Your Own Medium and Heavy Trucks Question. Voltmeter on dash Drops down every time the relay cycle When cold I turn the key on I hear the relays energize and the wait to start light ...Logged. Re: 8.3 (mechanical) Intake Preheater Problem. Reply #1 – November 23, 2023, 05:39:15 pm. The fuel solenoid needs 2 wires to operate if it is internally grounded and could have three wires which. would be the ground, One wire is the pull in circuit and the other wire is the hold in circuit. The intake preheater only works …nskyline34 Discussion starter. 1706 posts · Joined 2013. #5 · Dec 5, 2023. Well ordered a complete GDP setup - intake manifold, intake horn, and their high flow grid heater. More than I wanted to spend, but the only company that makes them specifically for the C&C trucks and plus I like the idea of the added flow of the intake horn.Originally posted by dsalinas1939. i may have put this up before not sure but i have this 2014 c2 and its setting a 3494 code its intake heater mechanical fault i ran down the diagnostic tree and its tellin me it have to take to dealer for next procedure the heater eliment is working fine when i turn key on i hear it click on then off i see it ...

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Freightliner Custom Chassis would be your best source, since they installed it. The block heater is an accessory, not part of a Cummins engine. Call 1-800-FTL-HELP and have the last 6 digits of your VIN handy and they can tell you what you have. ... Cummins uses a grid-type intake heater to pre-heat incoming air; read your Cummins …813 posts · Joined 2007. #1 · Nov 18, 2009. Started the truck yesterday and check engine light came on. Checked codes with Smarty and there were two of them. They were P2609- No voltage drop seen from intake air heater and P0542- High voltage on the #1intake air heater relay. After checking the codes I noticed that my grid heater is not ...Here I show how to diagnose a air intake heater circuit on a Cummins Isc Engine27 Freightliner Trucks Service Manuals Free Truck Manual Wiring Diagrams Fault Codes Pdf. Wiring Diagrams Compact Nsx Contents. Wiring Schematic Manualzz. Freightliner Service Repair Manuals Wiring Diagrams Truck Pdf. M2 Multiplexing Emtsp. Freightliner Features. Freightliner M2 2003 2016 Installation Guide Zonar Systems …FREIGHTLINER M2 Heater Assembly. OEM #: A22-59312-000. SURPLUS RED DOT AUXILARY HVAC A/C HEATER ASSEMBLY FLOOR MOUNTED P/N: A22-59312-000 REPLACED BY P/N: RDH R4225 1. Create Estimate. Part Info. (541)922-6455 Request Info Enterprise Hagerman Inc. UMATILLA OR. $600.00.SAF-T-LINER C2. Parts Reference Manual ( Interior ) INTRODUCTION. The Thomas Built Buses SAF-T-LINER C2 parts reference manual provides the user with a tool to assist in identifying needed replacement parts and service information for their bus. It is intended to be used as a guide to help locate service parts information that resides within ...Thanks for the information.Since the yellow check engine light comes on, this indicates the engine ECM is receiving power and functioning. There are several things that can cause a crank no start on this engine.The first is a low or no fuel pressure condition. The engine needs at least 25 psi to start. If it is low, the injectors will not get ...Also the intake heater light on the dash comes on then stays on but is very dim, even with the engine warm. Mechanic's Assistant: ... My question is about the air intake heater system on my 2000 Freightliner FL70 that has a Cat 3126 engine. I have had the truck since March of this year.Feb 27, 2022 · The “wait to start” light comes on ever time during pre-start, but grid heaters never engage. It’s never worked since I bought the MH in 2013. I’ve used block heater to preheat engine prior to starting. Van Willams had this problem in 2015 and he checked all connections in engine room area which ended up resolving the problem. ….

Benefits of Solar Water Heaters - The benefits of solar water heaters are numerous. Visit HowStuffWorks to learn all the benefits of solar water heaters. Advertisement The benefits...I run four sets of them 2 in the head light and 2 in the fog and the never go out not when starting or grid heater 2001 Dodge 2500 quad cab , Auto, 306,xxx miles, S&B Cold Air Intake, Expandit 5 inch straight piped system, Smarty, Edge Insight CS for gauges , HID Fog Lights 8000k, HID Head Lights 4300k, Electric/Heated tow mirrors, Painted ...There is a heater element that can be between 750 and 1,500 watts that extends into the engine's cooling jacket. The benefit to this system is that you don't have any heater hoses to worry about replacing or leaking and the heat is put directly into the engine, where it's more efficient. ... As soon as the light goes out, the intake manifold ...Esker (ALESK): Record order intake in Q3 27-Oct-2022 / 07:00 GMT/BST   London, UK, 27 October 2022   Esker (ALESK): Rec... Esker (ALESK): Record order intake in Q3 2...18 Manual Transmissions and Clutch. 19 Drive Axles. 20 Fifth Wheels. 21 Trailer Couplings. 22 Headlights. 23 Vehicle Appearance and Care. 24 Pre- and Post-Trip Checklists. 25 Pre- and Post-Trip Inspections and Maintenance. 26 In An Emergency.Sep 28, 2012 · Blog Entries: 1. CAT 3126 does not have glow plugs and uses an air intake pre heater. Not sure there is a fuse for that but check the wiring diagram for your coach and see. Or, a visit to a CAT shop. __________________. 2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018. 2019 Grand Designs 384GK-R 5th wheel. EPA07 MBE 4000 OPERATOR'S MANUAL. HOT COOLANT To avoid scalding from the expulsion of hot coolant, never remove the cooling system pressure cap while the engine is at operating temperature. Wear adequate protective clothing (face shield, rubber gloves, apron, and boots). Remove the cap slowly to relieve pressure.Nov 6, 2011. #4. Yes, when you turn the key to the run position the gauges will sweep from the lowest values to the highest and the solenoids in the air valves will do a "chuff" test. Then the gauges will go to the positons for the conditions present when the engine is off. I'm not sure of the 5.9 Cummins engine has an intake manifold grid ...PartsPro PartsPro® is an electronic parts catalog system, showing the specified vehicle’s build record. EZWiring EZWiring™ makes Freightliner, Sterling, Western Star, Thomas Built Buses, and Freightliner Custom Chassis Corporation products’ wiring drawings and floating pin lists available online for viewing and printing. Intake heater light on freightliner, Freightliner Custom Chassis ... 09 Air Intake . 09–01 Air Cleaner Element Inspection and Replacement ; 13 Air Compressor . ... 83 Heater and Air Conditioner . 83–00 Safety Precautions ; 83–01 Air Conditioner Inspection ; 83–02 HVAC Air Filter Replacement ; 88 Hood, Grille, and Cab Fenders ..., FREIGHTLINER M2 Heater Assembly. OEM #: A22-59312-000. SURPLUS RED DOT AUXILARY HVAC A/C HEATER ASSEMBLY FLOOR MOUNTED P/N: A22-59312-000 REPLACED BY P/N: RDH R4225 1. Create Estimate. Part Info. (541)922-6455 Request Info Enterprise Hagerman Inc. UMATILLA OR. $600.00., Air intake restriction vacuum is measured in inches of water (inH 2 O). For vehicles equipped with a graduated indicator or a restriction gauge on the dash, check the gauge with the engine off. If the yellow signal stays locked in the red zone once the engine is shut down, or is at or above 25 inH 2 O, the air cleaner element needs to be replaced., 255 posts · Joined 2005. #1 · Dec 30, 2007. My dad has a Bluebird bus (Frieghtliner chassis) with a 2000 CAT 3126 engine. Since the weather turned cold here in CA (33 degrees F overnight) the engine has been more difficult to start. It is taking 6 or so 30 second cranks to get it started., The Saf-T-Liner C2’s Cummins engine is equipped with a grid heater inside its air system. This grid heater takes a few seconds to heat up and has three purposes: Assists the engine’s cold weather start-ability by preheating the intake air. Helps control white smoke during cold starting (reduced hydrocarbon emissions – EPA requirement), Since I haven't been getting the glow plugs light on the dash when I turn the key. I replaced the glow plug relay, no luck. ... S&B Intake 6/18 Water Pump / Radiator 6/18 Pillar Gauges 6/18 PMD relocated to bumper 12/12 ... -Webasto Diesel Coolant Heater w/Remote Start -Remote PMD on Heat Sync in bumper, HID Headlights w/new lenses, To contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. To contact Transport Canada, call the Defect In- ... 6 Heater, Ventilator and Air Conditioner .....6.1 7 …, Re: CAT 3126B "Wait to Start" Light. « Reply #4 on: October 23, 2012, 05:05:05 PM ». Rod, Certainly sounds like a loose connection or the pre-heat relay/solenoid with the points sticking. Locate the relay. With a voltmeter, check for 12 VDC on the large wire out to the intake heater when someone turn the key on., Sep 28, 2012 · Blog Entries: 1. CAT 3126 does not have glow plugs and uses an air intake pre heater. Not sure there is a fuse for that but check the wiring diagram for your coach and see. Or, a visit to a CAT shop. __________________. 2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018. 2019 Grand Designs 384GK-R 5th wheel. , To contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. Vehicles domiciled in Canada that are thought to have a defect that could cause a crash, injury, or death, should immediately be reported to Trans-port Canada and Daimler Truck North ..., Placeholder Product Name. Placeholder Product Name. $00.00. 0000-0000 Placeholder Application. The Cummins Genuine 5335502 Intake Air Cover & Heater Grid provides your 2007.5-2012 Dodge 6.7L Diesel (Cab & Chassis Only) with …, Mar 6, 2020 · This heater is a GREAT drain on the 12 volt system. (240 amps). The heater comes on when the ignition is turned on and runs providing heat to the intake of the turbo when cold starting. Hence the "Wait to start" light on the dashboard. If you activate the start before this light goes out, you will overload the circuit and possibly the fuse will go. , 5 Driver Controls. 6 Seats and Restraints. 7 Climate Control. 8 Cab Features. 9 Engine Starting, Operation, and Shutdown. 10 Optional Engine Systems. 11 Emissions and Fuel Efficiency. 12 Brake Systems. 13 Manual Transmissions and Clutch., Nov 13, 2015 · Here I show how to diagnose a air intake heater circuit on a Cummins Isc Engine , My grid heater is not firing up on my 6.7. It is in the single digits at night and no where near the 55 or 60 F function point. I checked the power to the main solonoid that controls power to the grid and I also manually fired the solonoid and varified that it is working. The problem seems to be that the ECM is not giving a command to activate ..., Air intake restriction vacuum is measured in inches of water (inH 2 O). For vehicles equipped with a graduated indicator or a restriction gauge on the dash, check the gauge with the engine off. If the yellow signal stays locked in the red zone once the engine is shut down, or is at or above 25 inH 2 O, the air cleaner element needs to be replaced., My question is about the air intake heater system on my 2000 Freightliner FL70 that has a Cat 3126 engine. I have had the truck since March of this year. Initially the indicator light for warming the engine when cold stayed on for about 30 seconds as it. was supposed to and the engine started fine. I have a lengthy bit of info I want to include ..., Intake Heater Light: Troubleshooting Tips for Bus & Freightliner | JustAnswer. Ask an Expert. Car Questions. Truck Repair. This answer was rated: …, Apr 11, 2011 · First, the heater should come on every time the key is turned to the on position. Then the Engine ECM checks the coolant and intake air temp and if they are high enough, the heater shuts off. Second, the 12volt power that operates the circuit comes from the truck, not the ECM. The most common reason for the heater not to work is a loss of power ... , 18 Manual Transmissions and Clutch. 19 Drive Axles. 20 Fifth Wheels. 21 Trailer Couplings. 22 Headlights. 23 Vehicle Appearance and Care. 24 Pre- and Post-Trip Checklists. 25 Pre- and Post-Trip Inspections and Maintenance. 26 In An Emergency., Also the intake heater light on the dash comes on then stays on but is very dim, even with the engine warm. Mechanic's Assistant: ... My question is about the air intake heater system on my 2000 Freightliner FL70 that has a Cat 3126 engine. I have had the truck since March of this year., 83.....Heater and Air Conditioner 88.....Hood, Grille, and Cab Fenders Introduction Maintenance Manual Contents I–4 108SD and 114SD Maintenance Manual, November …, I operate a 2010 Freightliner M2- 112 with an MBE4000 mercedes engine. It has about 20k on it. It has an "intake heater" flashing light on the dash that the dealer can't seem to find the cause of. The closest dealer is over an hour away, so it takes a lot of time to take it there. When..., top trailer lights went out on 2014 M2-106 box truck . can't locate fuse for it and desperately trying to avoid a ticket while working at night. been at … read more. Associate of Applied Scienc... 2016 m2 106. Range inhibit light is on., The headlights on a freightliner truck can typically be adjusted using a vertical adjustment screw. The lateral position of the headlights is typically fixed. Whenever you replace ..., usmilret. Find the intake air heater and then find the leads to that heater. Disconnect the leads and check for resistance at those leads. You can check Youtube on how to do it. If your intake air heater is not heating up and if there is no voltage drop because of the electrical load that is not placed on the intake air heater then you can ..., 09 Air Intake . 09–01 Air Cleaner Element Inspection and Replacement ; 13 Air Compressor . 13–00 Safety Precautions ; 13–01 Air Compressor Inspection ; 15 Alternators and Starters . 15–00 Safety Precautions ; 15–01 Alternator, Battery, and Starter Connections Check ; 20 Engine Cooling/Radiator . 20–00 Safety Precautions ; 20–01 ..., Aug 6, 2015 · My question is about the air intake heater system on my 2000 Freightliner FL70 that has a Cat 3126 engine. I have had the truck since March of this year. Initially the indicator light for warming the engine when cold stayed on for about 30 seconds as it. was supposed to and the engine started fine. I have a lengthy bit of info I want to include ... , Nov 6, 2011. #4. Yes, when you turn the key to the run position the gauges will sweep from the lowest values to the highest and the solenoids in the air valves will do a "chuff" test. Then the gauges will go to the positons for the conditions present when the engine is off. I'm not sure of the 5.9 Cummins engine has an intake manifold grid ..., Wait to Start light does not come on in the dashboard. Truck will start but is difficult especially in colder temps now. ... My question is about the air intake heater system on my 2000 Freightliner FL70 that has a Cat 3126 engine. I have had the truck since March of this year. Initially the indicator light for warming the ..., There is a heater element that can be between 750 and 1,500 watts that extends into the engine's cooling jacket. The benefit to this system is that you don't have any heater hoses to worry about replacing or leaking and the heat is put directly into the engine, where it's more efficient. ... As soon as the light goes out, the intake manifold ..., I run four sets of them 2 in the head light and 2 in the fog and the never go out not when starting or grid heater 2001 Dodge 2500 quad cab , Auto, 306,xxx miles, S&B Cold Air Intake, Expandit 5 inch straight piped system, Smarty, Edge Insight CS for gauges , HID Fog Lights 8000k, HID Head Lights 4300k, Electric/Heated tow mirrors, Painted ..., Air intake restriction vacuum is measured in inches of water (inH 2 O). For vehicles equipped with a graduated indicator or a restriction gauge on the dash, check the gauge with the engine off. If the yellow signal stays locked in the red zone once the engine is shut down, or is at or above 25 inH 2 O, the air cleaner element needs to be replaced.