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Hummer Knowledge Base

The Hummer Knowledge Base


Coolant Flow Valve:


>Does anyone know why my 97 1/2 hummer wont heat! I have air but but no heat?

Check the coolant flow valve located in the passenger side of the engine compartment. It is a valve that controls the flow of coolant into the heater core. Sometimes this valve sticks. 1st check to make sure it is not stuck and then have someone move the control to see if it is moving.

Cory T.


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