1989 Cadillac Sedan DeVille

did you use the correct type of Freon for the compressor type?

I am not a Cady expert. In my experience, you can probably run an engine with out the air pump ... but why would you? The air pump reduces emmissions and improves performance. Removing the pump will also require reconfiguring the belt scheme.

Best solution is fix the pump.

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even after car warms up is there no heat is there any air at all comeing out of vents rather it be hot or cold reason i ask theses questions is to solve your problem

prob a low charge easy to do get R134a from parts store with hose start with about half a can and check it make sure ac is on max when you charge it light should go off

It sounds like the idle compensation circuit for the engine is dirty or faulty. Have your car checked at a shop. have them check the idle air motor for dirt or malfunction. It could be that it only needs to be cleaned or replaced.

The compensation circuit adjusts the idle/slow speed of the engine. The air conditioner puts a load on the engine and this circuit adjusts the engine speed to compensate. Also, when the car is cold this circuit adjusts the idle speed to prevent stalling and help the engine warm up faster. I hope this information helps you.

check or loss of vacuum to mode control switch in dash ac control. these are not blend doors, they are air flow control, a blend door controls the air temperature not where it comes out.

Unfortunately for you ( i had the same problem) The A/C compressor HAS to be in working order on these cars or else all heck breaks out with the climate control.

If it's a nice car, get a new compressor installed. If it's borderline- get rid of the car.

I paid 2200 to Cadillac to fix the A/C and climate control only to have the transmission fail in my '93.

I dumped the car soon thereafter....

change the thermostat

there,s a chance that your hot-cold air trap is not working