specialkeay Posted November 17, 2010 Share Posted November 17, 2010 :fs1: I have an 89 4.0. I have a problem with the heat not wanting to work, but the cold blows nice.Any theories? Link to comment Share on other sites More sharing options...
juan Posted November 17, 2010 Share Posted November 17, 2010 Make sure the heater valve is working and not stuck closed, if found to be ok, feel the heater hoses to see if they are getting hot, try flushing the heater core with your garden hose - you will be surprise how much crap comes out... Link to comment Share on other sites More sharing options...
specialkeay Posted November 17, 2010 Author Share Posted November 17, 2010 It's not that when the heat is on it blows cold air. When it's on cold its fine, but when the heat is on it doesn't blow at all, hot or cold, but you can still hear the fan working. Makes me think that the tubes in the core aren't clogged but maybe the fins are clogged externally by some foreign substance e.i. mouse nest. Wich is possible because I have found quite a few mouse nest. Link to comment Share on other sites More sharing options...
87Warrior Posted November 18, 2010 Share Posted November 18, 2010 You could start by removing the cowl, plastic body panel the windshield wipers come through, and cleaning it out. This is the intake for the blower motor. More than likely a vacuum line got unplugged somewhere in the dash and is not allowing the proper HVAC 'doors' to open or close. Link to comment Share on other sites More sharing options...
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