COOLANT TEMP GUAGE FLUCTUATES ERRATICALLY.

1999 GMC Yukon

Tiny

rich joy

November, 18, 2009 AT 9:00 PM

Engine Cooling problem
1999 GMC Yukon V8 Four Wheel Drive Automatic 165K miles

For a week now the temp guage on my truck's display has been fluctuating suddenly and spontaneously. The cabin heater also stops blowing HOT air when the guage goes to max.

I checked: coolant level - good. Upper radiator hose - warm/hot with good pressure. Hose to heater core - warm/hot.

Any thoughts as to what is causing this?
Have a great day!

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1 Answer

Tiny

rasmataz

November, 18, 2009 AT 9:07 PM

Replace the thermostat and test the coolant temperature sensor.

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