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What's the cause???

 
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GrimReaper
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PostPosted: Wed Apr 10, 2013 9:57 pm    Post subject: Question What's the cause??? Reply with quote

I have a 2001 Impala 3800. A while back toward the end of summer I noticed that when i shut the car off the cooling fan would stay on for about 5 minute. I then noticed that my temperature gauge would sporadically not work in conjunction with the cooling fans. If the gauge works the fans shut off. I then noticed that when the gauge didn't work then the air conditioning didn't work. So if the the gauge was working all was fine but if not the fans stay on and no air conditioning. A couple months ago the gauge the gauge quit working all together so no air. No other problems. Car never over heated or anything. Now that summer is here I need to get it fixed so I have air.
Anyone know what can cause all this?
Thanks for any info. Jared
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2008BlueImpalaLTZ
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PostPosted: Thu Apr 11, 2013 1:39 pm    Post subject:   Reply with quote

First - check the engine coolant level inside the radiator (don't rely on visually checking the coolant overflow jug). I suspect you are low on coolant (probably due to a leak).
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Pitch Black SS
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PostPosted: Thu Apr 11, 2013 1:48 pm    Post subject:   Reply with quote

coolant temp sensor

If the sensor fails, the PCM doesnt know the exact temp, so it disables the AC to help protect the engine from overheating. It will also make the fan run after the car is off just in case its running hot.

The PCM acts as if its running hot as a fail safe because it just doesnt know the real temp.

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ZSPOT
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PostPosted: Thu Apr 11, 2013 1:49 pm    Post subject:   Reply with quote

**beat by a minute. LOL**

If your ECM doesn't know for sure what temp your car is at, it goes into a protective mode and runs the fans all the time. Hard to say what caused it in your case, but I would start by replacing your thermostat. Then replace the coolant temp sensor located just under the thermostat housing. Both are cheap and easy to replace.

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GrimReaper
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PostPosted: Thu Apr 11, 2013 3:15 pm    Post subject:   Reply with quote

Thanks. Coolant sensor or thermostat is what i was thinking but i wanted a second opinion. Thanks Again.
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Pitch Black SS
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PostPosted: Thu Apr 11, 2013 4:01 pm    Post subject:   Reply with quote

t-stat wont keep the gauge from working.

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Frank
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PostPosted: Fri Apr 12, 2013 6:58 am    Post subject:   Reply with quote

Check the harness first - it runs right above the exhaust crossover and the insulation can melt off the wires and cause them to short together, causing a P0128 code due to the PCM not getting the input from the sensor.

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2008BlueImpalaLTZ
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PostPosted: Fri Apr 12, 2013 2:15 pm    Post subject:   Reply with quote

GrimReaper wrote:
Thanks. Coolant sensor or thermostat is what i was thinking but i wanted a second opinion. Thanks Again.


Did you check your coolant level?
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Gems
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PostPosted: Sat Apr 13, 2013 5:57 pm    Post subject:   Reply with quote

I had this same problem a few years ago and it was the coolant temp sensor... But when I changed it the fans continued to run all the time... I had to disconnect the battery to reset the computer (or something) before it started working correctly again...

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