my a/c was doing fine until i wason my way from work, it stop blowin cold checked the freon level it was fine. Check relays, fuses, changed low pressure switch. But i run 12v to the compressor it will come on and blow cold. Please what could be the problem, and really stumped. also changed the control in the inside. please anybody

IIRC, there is also a high-pressure switch (which, basically, cuts off power to the compressor if the high-pressure side gets too high).
You might try doing a search, I think a similar subject has been brought up before.

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Current ride: Belleville 220 DES ST - leather, reinforced front end, tan color. Runs on 'alternative fuel'
1996 Dodge Dakota
1986 Honda Civic CRX

Hey I pretty much have the same problem. See my thread:

http://www.dodgeforum.com/m_859264/tm.htm

I am still waiting for a part to convert from R-12 to R134, but I doubt that I have a low pressure issue, as my AC also works (and blows cold air) when it gets 12V. I don't think my truck has a high pressure relay. I am starting to think that my ac switch is toast in the cabin...

Let me know if you found your problem. I'll try to work on my truck this weekend.