My front ac is blowing warm while my rear ac is blowing cold with out any issues. I can put the front on vent and adjust the heat to the warmest setting and then work it back to the coolest seting and the system responds fine. However the ac will not blow cold. I have checked the low pressure ac line and it is cold, the compressor is switching on as it should. could the blend door still be the cause even though the door seems to be working fine while on heat?
Sounds like a vacuum leak.
SOURCE: Bad Ac/Heat Blend door
In the vent piping deep under the dashboard...the door is usually controlled by vacuum servos. Generally the door it's self doesn't go bad, it's an associated component.
SOURCE: 1999 Lincoln Navigator Heating Problem
if the heater core is getting hot then the problem is the air temp control blend door actuator, a common problem.
SOURCE: I only get warm air blowing out of the front vents
sounds like the air handler for the front is inoperative the wheel that operates it may be broken. its in the dash.
SOURCE: Can I access the blend door in a 2004 Lincoln
pull dash completley and the actuator motor will be accessable
SOURCE: 1996 lincoln towncar. No a/c compressor engagement unless jumped
the control unit is no good.i had a similar situation with a 98 tracker,and installed a switch to give it a ground for the compressor relay that comes from the a/c computer module.
it works good and goes on and off with the a/c switch.
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