Temp Gage, 2002 Comaro

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  #1  
Old 03-25-14, 07:51 PM
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Temp Gage, 2002 Comaro

I took my 2002 comaro V6 to the dealer and they checked it out and said that the thermostat was stuck open. They did not have time to fix. Took the car home and installed new thermostat and temp sending unit. Gage still does not work and the service engine light is still on I was wondering If the codes need to be cleared or is there still some other problem. Help
 
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Old 03-25-14, 08:32 PM
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You had a problem with the gauge not reading and the check engine light was on. You took it to the dealer and they said the thermostat stuck open was causing the problem ?

I don't think so.

Did you have the computer scanned to see what the code was ?
The computer would need to be reset if the service engine light came on. The computer may see the same thing as your gauge in which case it may not reset.

Is there a single wire or two wires on the temperature switch ?
I'd use a voltmeter to check for DC voltage on the wire(s). No voltage could mean an open wire.
 
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Old 03-26-14, 03:48 AM
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Yes I did have it rechecked and they did not tell me the code they just said the same thing the thermostat was stuck even though I changed it. I also have checked the wires going to the sending unit and there is power to the one wire. There is 2 wires. Help
 
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Old 03-26-14, 04:25 AM
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It's possible you bought a bad thermostat, several yrs back I bought and installed a fail safe thermostat on my ford 4x4 and it failed within a few months. It's replacement has been working fine ever since.
 
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Old 03-26-14, 04:44 AM
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So the temp gauge is reading low .. engine is coming up to temp?
 
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Old 03-26-14, 06:03 AM
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Probably p0125 code.
Possible causes- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection.
what does your guage reading?3.8 or 5.7 engine?
the coolant temperature sensor(ECT)would have to be checked and its circuit.
this is a thermistor.do you have a voltmeter?and some tpins to backprobe the electrical connector.
 
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Old 03-26-14, 07:45 AM
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OP said it was a V-6 Joe ...........
 
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Old 03-27-14, 06:35 AM
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the coolant temperature sensor(ECT)would have to be checked and its circuit.
this is a thermistor.do you have a voltmeter?and some tpins to backprobe the electrical connector.
 
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Old 03-27-14, 10:46 AM
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I also have checked the wires going to the sending unit and there is power to the one wire. There is 2 wires.
Can you tells us what voltage you measured on the one wire ?
Should be around 5vdc.
Can you short the two wires together and see if you still have any measurable voltage ?
 
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