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Why is the heater blowing cold air all the time in to the cab of a Cherokee sport 98?
Aspo67
There are a few possibilities. First, check to see that you have enough coolant/antifreeze in the system. With the engine running, (in park, e-brake on) and warmed up, watch the overflow reservoir to see if there is coolant returning at an even flow, with no air bubbles. Next is the heater control valve. this is controled by vacuum. The testing process is somewhat lengthy, but simple. You will need a vacuum pressure tester. Consult your manual for test procedure. The last thing that I would suspect is that the heater core is blocked. It will need to be tested for flow. You can do this while the core is in the vehicle.
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∙ 16y ago
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