water temp gauge problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-17-2007, 07:43 PM   #1
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Default water temp gauge problem

my water temp gauge just stopped working. it gets power when i start the car it just doesnt seem to be reading anything any ideas?
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Old 01-17-2007, 08:10 PM   #2
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How about I move this from Detailing and Appearance to the 87-91 section for you?

Can you be more specific? WHAT does it read on start and later?
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Old 01-17-2007, 09:44 PM   #3
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Are you sure its the gauge? Is it reading anything? Mine appeared to have stopped working as well and I discovered that it was simply my thermostat had stuck open. It was just staying too cool.

Otherwise its most likely the temperature sender/sensor. The gages don't commonly go bad. If you have access to a scantool, it would be beneficial as you can then see what the ECM is showing directly.
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Old 01-17-2007, 11:28 PM   #4
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However, on these cars, the temp guage runs on its own sending unit. It uses one wire to the sending unit just below the intake tract. It does not get info from the ecm and has nothing to do with the temperature sending unit which is a 2 wire sensor near the thermostat. In short, these cars run on 2 temperature sending units if you have the dash guage.

If you are getting no reading, or a very low reading, and heat is hot on the coldest days, it is likely the connection at the sending unit or the sending unit itself. The sending unit is 20 bucks at the dealer, and make a new o ring connector for the sending unit.
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Old 01-18-2007, 12:50 AM   #5
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do you get heat at all??
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Old 01-23-2007, 07:16 PM   #6
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Default temp gauge

i get heat. the heat works REALLY good. i replaced the sesor thats like under the intake and that didnt work. where would the other sensor/sending unit be?
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