Question about 1997 GMC Sierra

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Temperature guage keeps going hot and cold - 1997 GMC Sierra

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2 Answers

Harvey N Tawatao

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Check the Antifreeze level first and then replace the thermostat. Note that the GM Dex-cool should be replaced every 5 years or 100,000 miles, which ever comes first. The Dex-cool after so many years will break down and crystallize causing restriction of coolant flow through out the engine's coolant pockets and radiator causing the issues your have.

There was a GM TSB to flush out the cooling system with Preston radiator flush and replace the thermostat and Dex-cool with a 50/50 mix water/antifreeze. To much water will freeze in the winter, causing cracked blocks and intake manifold. To much antifreeze will gel up when heated, causing flow restriction. If your not sure how to get the proper mix, you can buy the 50/50 pre mixed engine coolant.

Good luck and this should help address the issues your having with your cooling system.

Posted on Jan 05, 2010

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Anonymous

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Buy you a new temp sensor from the dealer not autozone,try that,my suburban did the same thing cause i got a cheap piece of **** sensor from az

Posted on Jan 05, 2010

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