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1990 GMC Sierra heater trouble


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Hillbilly910
User

Nov 7, 2012, 11:02 AM

Post #1 of 2 (1246 views)
1990 GMC Sierra heater trouble Sign In

the heater/defrost fan works fine, but the temp control wont heat up. never had problems before, but its just blowing cold air. Engine temps are up, and thermostat appears to work (engine temp drops when reaching 190).

Thanks in advance

HB
p.s the controls are digital


Hillbilly910
User

Nov 7, 2012, 11:41 AM

Post #2 of 2 (1220 views)
Re: 1990 GMC Sierra heater trouble Sign In

Just checked both lines into heater core, and both are screaming hot to touch once engine reaches operational temp.
Coolant is clean, and levels topped off.






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