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97 gmc Yukon My question is that your heater in the truck does not push out any air from the vents AND if any air does comes out it is warm not really that hot?
Wiki User
∙ 15y ago
The vacuum tube to the heater control is broken in two or cracked...usually in the engine compartment. It's a black, hard plastic tube or pipe about 3/16" od. Without vacuum, the heater control cannot open and close dampers to direct air flow.
Wiki User
∙ 15y ago
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