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When AC is turned ON heat comes ON,instead of cold air on 1993 Buick Park Avenue?

This problem was noticed on many old model Buick cars.
On 1993 Buick you will have dual zone.
Dual zone means separate control for drivers and passenger side.

This problem is either loose wiring or short in module.There are two modules.One is control panel module and other is priogrammer module.
First test the wiring.
The diagram shown below:---
With the a/c turned on, test for power on the dark blue wire at the pressure switch connector at the accumulator.graphic




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This system uses both the control panel and another module under the passenger side of the dash called the Programmer. It is possible the Programmer is faulty and is shutting the a/c down, it would be best to connect a scan tool to the system so that the readings from both modules could be accessed to know for sure before replacing another part. It is the Programmer that sends the a/c request out to the ECM for compressor engagement.

This mentioned details will help you,to confirm the problem.
Thanks.

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For car AC related and Heater related solutions. You can refer the options mentioned below:---

Car AC Blows Warm Air ?


How to test AUTO AC pressure?


AUTO Air Conditioning Troubleshooting?



AUTO A/C COOLING PROBLEM?


Fixing refrigerant leak?


How to locate Car AC Refrigerant leak?


CAR AC INTERMITTENT COOLING?


What causes INTERMITTENT COOLING on Car AC system?


Car AC making Noise?


BAD ODOR ON CAR AIR CONDITIONER?



How to Recharge Car's Air Conditioner

http://repairhelpcenter.blogspot.com/2011/10/how-to-recharge-cars-air-conditioner.html

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