My ac is not blowing cold air. the fan will only blow warm air. It seems like the compressor is not working.

You probably replace the wrong switch. I believe the high pressure switch is mounted in the back of the compressor. Pull the plug and jump it. If it works, replace the switch. I don't recommend you leave the jumper in the plug. If it the A/C pressure is to high, you could blow lines and such. Costing you a lot of money.

Could be a leak in air-conditioning line or compressor on its way out does it squeal at all

Has anyone checked the freon charge ?

Is the radiator fan still coming on ? Is the compressor running ?

What do you mean when you say it wont shut off? is it blowing hot air or do you just feel a lite flow of hot air even if you have the settings to cold?

If this is the problem that you always feel hot air at low flow and the ac goes to hot air then i would say one of two things, first if you have the selector to cold and you feel hot air then there may be a problem with the blend door, this door move to allow hot or cold air, the door may be broken or just a bad motor that controls it. keep in mind if the ac system shuts down for any reason the air then will be warm, it will be about the same temp as outside and maybe a little hotter.

this problem almost sounds like the ac compressor shuts off and then you are getting the outside air which is hot, there are many reasons for the compressor to shut off, it could be the compressor clutch heating up and disengaging , this would be due to a bad compressor clutch.

another reason is the fans are not working, the best thing to do is when the system starts to blow warm check and see if the compressor is running, start engine and look at the front of compressor, with ac off the front of it will not move, and then with ac on the front will spin, check it out and let me know, if it blows warm air and ac is not working then it may be compressor problem but if you are getting warm air and the compressor is spinning then it may be a door problem.

This is hard to check with out testing the system, so i listed a few things to check and let me know the out come. also the ac blows cold for how long before it gets hot air blowing out of the vents, good day.

Check if the compressor is working.
looks like there is a problem with compressor , hence working intermittently.

Cooling fans working? If you notice the air getting warm mostly while stopped, probaby cooling fans not turning on. if the fans are working properly, may be low on freon and need a recharge.

your a/c fan may not be working or slow, if not then your compressor is starting to fail. you could save it by changing the freon and compressor oil, if not the you have to change it.

"it seems to work fine but will not get cold"
Not sure how it can work fine and is not cold. When you say work fine, is the light on and the freezer fan blowing but is the compressor running?

Unplug the Ref and wait about 30 min or so, plug it back in and listen for the compressor to start running. You should be behind the Ref to hear this. If you don't hear it start running then you may hear a clicking noise. This clicking is a problen with the compressor start relay. If the compressor runs but still is not cold then it could be low on coolant.

Either you are out of coolent or the compressor is not working.

First check the fuses, then lift the hood and have a friend turn the air on. The compressor should cycle, if not take it to a mechanic. If it does cycle you are low on freon, take it to a mechanic for a system charge. Make sure they check for leaks first.