Question about Chevrolet Silverado 1500

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I get an error message that says my engine is hot & the A/C is turned off. The fan then runs constantly. The temperature gauge is pegged on zero when this happens. The engine is not hot. This comes & goes.

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  • Steve Brodie Oct 05, 2010

    Both happen at exactly the same time and are likely to be caused by the same thing.

  • Steve Brodie Oct 05, 2010

    2008 Chevrolet Silverado 6 cylinder

  • Steve Brodie Oct 06, 2010

    Thanks. Now I know where to start.

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The Body Control Module or BCM is giving the ECU the wrong signal. It could be the temperature sending unit is giving false readings to the ECU. Without a meter and the vehicle it is hard for me to pin point the exact problem. But it is one of the three. The sending unit, the BCM, or the ECM.

Posted on Oct 05, 2010

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Hi,

Kindly mention the year, make and model of the car?

Thanks!!

Posted on Oct 05, 2010

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  • Master
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The ect engine coolant temp may be reading improperly. If you have a scan tool available you can check what the computer thinks the temperature is and put a thermometer in the radiator and see what it reads.If the the two readings do not coincide with each other the ect is most likely bad. As far as the guage goes it actually runs on a seperate sensor which is the temperature sending unit located on the left cylinder head between cylinder 1 and 3.

Posted on Oct 05, 2010

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  • Jonathan S
    Jonathan S Oct 05, 2010

    Will double check to make sure the ect doesn't run both on this vehicle.What is year make and model?

  • Jonathan S
    Jonathan S Oct 05, 2010

    The answer is probably correct but depending on whether it's a car or truck depends on whether it has a separate sensor for the guage. If its a car the ect controls both. On the trucks it has both sensors.

  • Jonathan S
    Jonathan S Oct 05, 2010

    Did the check engine or service engine soon light come on as well? If possible and you have a scan tool available would it be possible to scan the vehicle for codes? If an Autozone or Advanced Auto is available in your area they will scan this for you at no charge. The stored codes can be an invaluable tool in diagnosing this type of issue.

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2004stratusgets hot, no leaks engine cool but no antifreeze in rad or overflow oil clean. ?????


if it over heats when stationary but cools down when moving , that is an indication of a cooling fan problem
If the engine has a viscous fan hub ( fan clutch) replace it as it is not spinning hard enough when stopped to draw air through the radiator
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Cooling system


For car running hot and overheating issues, I suggest to you go through this help links.

Click this link below and go through the troubleshooting procedure to take care of the problems: ----



Car runs hot?

http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
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All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
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Car freeze overnight and started overheating while driving?

http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html

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http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
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http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
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----------This details will help.Thanks.

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1 Answer

Bought 2001 Lumina.. head gasket was leaking. fixed that n noticed cooling fan motors were not running. Replace all 3 relays n ect n fans started working. Drove it two days n it started runnin hot pulled...


I had a similar problem. Is your temperature gauge pegged to the right as very hot? Or reads always cold, even when hot. If it is a 3100 motor their is a coolant temperature gauge sending unit under the air breather intake that is right next to where you replace the thermostat.

Get a haynes repair manual at a parts dealer, Amazon, or your public library.
On the Chevrolet Lumina, Monte Carlo, & Impala FWD 1995 to 2005 it's under section 3-8 on page 3-6. It goes into great detail, and it's too complicated to explain here. If your sensor is bad, but the wires and fuses are good then the fans won't run.

Your second fan only runs when the air compressor is turning, If your ac compressor is not running then the sensor will not have the passenger fan run.
You have to see if the fan motors are good and then the wiring is good, and no fuses blown. You might blow fuses so have extra blue ones if I remember right. Recheck fuses after testing.

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Make sure you get the air out. There may be "high spots" on the engine that you can unscrew to let the air pockets t. Close this small valve when just hot water comes out.
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