Question about 2002 Jeep Liberty
Jeep Liberty, 2002; large engine (Minnesota - is cold here)
When coming to a stop, at a traffic light for example, the air temperature from the heater goes cold; COLD, not just cool. Fan remains on. Coolant is at the proper level. Heat gauge does not drop (about in 12oclock position).
Have covered the front radiator with cardboard (is loose, outside temp is below zero - no gauge movement) This did not help at all. Belts are good. No leaking of fluids have been seen. No engine codes.
Ok, judging from what you've said it sounds like a vacuum issue. The temperature controls are activated by vacuum which is produced by the engine. Look for small hoses that lead from the intake manifold to the firewall, check them and make sure they are not broken, disconnected, or leaking. The vacuum directly controls the doors inside your dashboard which push the air to the heater core. Also make sure that the coolant hoses going to and from the firewall are hot. If all that checks out, then the controls inside the car may have gone bad, or may have become disconnected from the vacuum supply, or the actuator door inside the dash is stuck or broken.
Posted on Dec 23, 2008
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Posted on Jan 02, 2017
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