1998 Mercury Sable ac and heater

1998 MERCURY SABLE
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SEASPORT
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Air Conditioning problem
1998 Mercury Sable V6 Two Wheel Drive Automatic 67000 miles
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After idling with the ac on (blowing cold) for a few minutes, the ac shuts off automatically and the heater comes on. Could this possibly be the temperature sensor?
Also, after the car sits for a week or so, the open door light stays on with all doors shut. I cannot find the door sensor to check it. I see a cylinder unit near the door hinge encased in rubber and plastic. Is that the sensor button. All fuses look good. How where do I check the door open light?
Dec 3, 2007 at 11:06 AM
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MERLIN2021
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If you have automatic temp control, press off and floor together with the key in ON position, then within 2 secs, press auto, post the code that comes up, as for the door, get a can of spray brakekleen, and a can of spray white lithiun grease, spray the door LATCH, liberally and open and close the door 5 times, repeat this 2-3 more times, let dry, then spray with the grease...
Dec 6, 2007 at 2:32 PM