Question about 1997 Jeep Grand Cherokee
You may have a vacuum leak affecting the vacuum supply to the control switch. I don't have the manual for your car, but if you have a vacuum operated valve on your heater hose, that could also limit the flow of hot water to the heater core. Look for the small vacuum line that goes from the engine intake manifold through the firewall to the control switch. Look closely at the connection to the intake manifold, as that is one of the primary failure modes. the other typical failure is the vacuum switch itself. If you can get to back of the control switch and pull the vacuum connector off the switch, check for vacuum on the supply line from the engine with the engine running. If you're getting a good vacuum there, your switch is likely the problem. Let me know if you have more questions.
Posted on Sep 13, 2010
Check the vacume hose under hood on left side next to a/c conector line by firewall check for cracks or disinegrated
Posted on Sep 15, 2010
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Posted on Jan 02, 2017
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