Question about 1991 Lincoln Town Car

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1998 Town Car A/C Blows Hot Air But Is Charged Up

I Do Believe my exchange door is working i hear it open and closing when changed but i get a faint bit of cold air when i turn A/C on and then it gets all hot ,, but compressor runs good and lines under hood frost up and drip water off could i have a blockage of some sort..?
and my heat is not working either when i change it to 90F on digital controls...

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  • Mark Carmel May 11, 2010

    Where is the thermal blower lockout located?

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Hi - There may be 2 separate problems. On my 1991 Lincoln Town Car, there is a Thermal Blower Lockout sensor that disables the heater from blowing until the engine temperature reaches a specific temperature. This way if you have vent or floor settings and 90 degrees set and it is winter, you won't get blasted with cold air. When the vehicle warms up, the TBL circuit enables the climate control to blow the hot air. If you use the flr/def instead of the floor or vent control, the TBL should not prevent the heater from working even with a cold engine. On my car, the TBL went bad and always prevented hot air from blowing on the floor and vent settings, even when the engine was hot. Another thing to check is a thermal limitor resistor. It is designed to cut off the blower at very hot temperatures, except if the blower fan is in the hi setting.

As far as the A/C is concerned, can you verify if the clutch is engaging or not? A rapid cycling of the clutch is an indication of low freon. If you are absolutely sure that you are fully charged on freon, I think there are 2 possible causes: (1) Bad pressure switch on the accumulator is indicating low freon that is telling the compressor not to work; (2) a blocked orifice tube.

Posted on Sep 03, 2009

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When the lines freeze up it's a sign the freon is low.

Posted on Aug 04, 2009

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