How many coolant temp sensors are there? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-06-2005, 06:48 PM   #1
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Default How many coolant temp sensors are there?

Good Evening Bonnie Famz,

A question on how many sensors are there in the 1988 SSE bonnies? I heard that there were at least two coolant temp sensors in our vehicles. Would someone step up and let me know for sure how many there are?

Having a small problem with high temp readings. I'm thinking maybe to change the temp. sensors but don't know how many there are?!

My bonnie only has one electrical fan, not two.(?) Any help is as alway'* much appreciated. .
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Old 09-06-2005, 06:53 PM   #2
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There should be 2 sensors... One for the Gage and the other for the ECM

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Old 09-07-2005, 06:13 PM   #3
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Quote:
Originally Posted by jr's3800
There should be 2 sensors... One for the Gage and the other for the ECM
Thanks a lot jr's3800 for the info. If changing these sensors doesn't cure my unusual high temps, then maybe change my ECM?
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Old 09-07-2005, 06:17 PM   #4
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Have you by chance hooked up a scantool to the car to see what the ECM is seeing in the way of Temps? Might even be a bad ground at the throttle body... Look under the throttle body and you'll see a sensor, look at the wires and check them...

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Old 09-07-2005, 06:27 PM   #5
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Quote:
Originally Posted by jr's3800
There should be 2 sensors... One for the Gage and the other for the ECM
Thanks a lot jr's3800 for the info. If changing these sensors doesn't cure my unusual high temps, then maybe change my ECM?
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Old 09-07-2005, 06:35 PM   #6
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Yes, I had my mechanic hook up the scan tool and he said that the ECM was reading at a lower temp than the gauge indicated, so what could that be? .
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Old 09-07-2005, 06:55 PM   #7
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It sounds like you have a bad ground, or one of those 2 switches is bad... But which one I'm not sure of... Look at the wires, there will be a ground under the throttle body, check it first before replacing the sensors..

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Old 09-08-2005, 07:37 PM   #8
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Thank You jr's3800. One of the sensors are located under the throttle body? And where is the other located at. This is just for future references. I will check to see if the wires are ok.
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Old 09-08-2005, 08:28 PM   #9
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Quote:
Originally Posted by Aviator Wingman
Thank You jr's3800. One of the sensors are located under the throttle body? And where is the other located at. This is just for future references. I will check to see if the wires are ok.
You may need to find someone with an 88 service manual.... My 91 shows 2 under the TB... Its pic is strange... Not 100% sure..

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Old 09-08-2005, 09:48 PM   #10
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What about the Low Tech Solution? Check/Replace the Thermostat. Check the Water Pump Although my guess is that your mechanic checked those already. Just a thought.
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