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Old 04-23-2013, 01:32 PM   #1
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Join Date: Jan 2013
Location: Orlando
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AC/ Heat Help

Hey guys I'm looking for some help with my heater and AC. I just recently purchased my TJ and the AC worked but heater did not. The AC works on all but the highest setting. The Heat blows cool. I found a shut off valve in the engine bay that the prior owner appears to have installed which looks to shut off flow to the heater core. I opened the valve and found that upon doing that, my heat works but my AC no longer works at all! After doing this the AC blows hot. I assume that the heater core isn't plugged seeing as how when it receives flow, it blows hot. Then why when this happens does the AC stop working? The shut off valve is leaking when I close it now to get AC I must've kicked loose the corrosion it had sealing it together so I need to replace the radiator hose from the thermostat to the core with a new un-tampered with one but what else can I do the fix this issue?

I appreciate the help guys!

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Old 04-23-2013, 01:41 PM   #2
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Its possible your temperature control door isn't working when turning the knob from cold to hot can you pyhsicaly hear the door ploping closed at both positions? If not cable may be off at either the control head or the door or the control head unit itself is stripped.

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Old 04-28-2013, 10:46 PM   #3
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Quote:
Originally Posted by flflash View Post
Its possible your temperature control door isn't working when turning the knob from cold to hot can you pyhsicaly hear the door ploping closed at both positions? If not cable may be off at either the control head or the door or the control head unit itself is stripped.
You were right, thanks for giving me the idea to check that. The prior owner must've not figured that out and went the hard way by shutting off flow to the heater core. The cable had been disconnected so when the selector was switched the actual unit to change from hot to cold wouldn't be affected. The cable ran from the back of the climate control switch box to down by the passenger's footwell. Thanks a lot!
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