I have a 2003 Mach 1, 5 speed. The air conditioning blows ice cold for about the first 10 minutes of driving. Then it stops working completely. I had a shop look at it and they said it was the coil on the compressor. I change the coil on the compressor and it is still doing the same thing. I also have changed the cycle switch. The charge in this system is correct and when this happens it is usually after driving on the freeway for about 10 to 15 minutes and then the compressor just stops engaging. The shop wanted to charge me 1500 dollars to change the compressor and evaporator because of the bad coil they claimed. I'm glad I did not do that. Does anyone have any idea what the problem might be or where I should start looking?