Question about 1998 Pontiac Bonneville

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1997 bonneville temp light flashes then heat quits

When i start my car after about a min the temp light starts flashing and the heat goes off, i just had the car flushed and main belt changed, can someone help

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Have your coolant system presure tested if good it may be bad water pump or thermostat stuck shut

Posted on Feb 10, 2009


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I changed the battery. There is no heat coming out now, was working before changing the battery. I think this is an electrical issue. The temp display will flash once in awhile. Does something need to be...

also have a 97 Bonnie and currently experiencing this problem - and not for the first time. It has happened before and this time was brought on by replacing my dead battery. When it happened previously, it went away all by itself. Talked to the service guys at local GM dealer. It was explained there are 3 computers that ccontrol HVAC. One of them has not reset causing the temp to flash. When it resets, heat will return.

I have found out Pushing buttons at power up doesn't help, taking the temp from max to min to max to min doesn't help, you can't see the HVAC codes on OBDC unless you have a special HVAC diags computer and A/C will work normally.

Unless you want to spend mega bucks on new computers, you'll have to wait it out and carry a few lap blankets in the car. //

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Heater is not working on 1997 Bonneville when temperature flashes. help? actuater or temp. sensor?

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Dec 16, 2009 | 1997 Pontiac Bonneville

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The rear wiper lights flash and until they stop flashing, which takes a while, no other buttons work, no fan for heating, no rear defrost, nothing til they stop flashing, HELP!!!!

try this key on engine runningblower on hight temp sset at cold . hold down the top button and the third on the control all the lights will start flashing after the module calibrates the light should go off.Good luck

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Flashing Temp indicator light, after 5 min on a cool morning

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your key reader is not reading the chip in your key you can either replace the ignition switch cost about 250 dollars parts and labor or i can tell you how to bypass it for less than 20 bucks in premium chat hope this helps
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Flashing security light in dash

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