Question about 1997 GMC Sierra
My truck has no heater and the temperture gauge is high
Probably air lock in the heater core. While engine running pull off heater return line and be ready to put it back on quickly, If air lock this will clear it and will show you if you have circulation. If this fails to solve the problem then you have a "door" control problem in you interior heater.
Posted on Jan 10, 2009
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Posted on Jan 02, 2017
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