Temp guage randomly rises then drops
Junior Member
Joined: Nov 2008
Posts: 277
From: Indianapolis, IN
Low Heat and a jumpy guage usually means you are low on Coolant. You might not see leaking but have you checked the Level?
A sticky thermostat that causes the tempurature to go High would give you HOT Heat. Low coolant would not pass through the heater core causing cooler heat and with no low coolant passing the Temperature sensor would show a unstable readings.
A sticky thermostat that causes the tempurature to go High would give you HOT Heat. Low coolant would not pass through the heater core causing cooler heat and with no low coolant passing the Temperature sensor would show a unstable readings.
Thread Starter
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Starting Member
Joined: Jan 2009
Posts: 108
From: Connecticut
Beginning Member
Joined: Jan 2010
Posts: 12
Remove or Disconnect
- Coolant from radiator.
- Bolts, nuts, studs (as used).
- Thermostat housing outlet.
- Gasket.
- Thermostat. Clean
- 3 mm (1/8 inch) bead of RTV sealer GM P/N 1052289 or equivalent to the groove on the coolant outlet sealing surface.
- Thermostat.
- New gasket (if used).
- Thermostat housing outlet.
- Bolts, studs and nuts (as used). Tighten
- Coolant in the radiator. Inspect For leaks at the sealing surface after starting the engine.
Beginning Member
Joined: Jan 2010
Posts: 43
Thread Starter
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Starting Member
Joined: Jan 2009
Posts: 108
From: Connecticut
I havent done much driving at all since the install. Maybe 2-3 miles. I only put about 40 miles on this truck a week if that.
It's not losing any coolant and it's not overheating, so maybe i'll just leave it alone.
It's not losing any coolant and it's not overheating, so maybe i'll just leave it alone.