1999 GMC YUKON COOLANT TEMP GUAGE FLUCTUATES ERRATICALLY.

  • Tiny
  • rich joy
  • 1999 GMC Yukon

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!

Do you
have the same problem?
Yes
No
Wednesday, November 18th, 2009 AT 9:00 PM

1 Reply

  • Tiny
  • rasmataz
  • Member

Replace the thermostat and test the coolant temperature sensor.

Was this
answer
helpful?
Yes
No
Wednesday, November 18th, 2009 AT 9:07 PM

Please login or register to post a reply.

Similar Questions