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Sounds like the ac system is freezing up, they are supposed to cycle the compressor on and off the keep the pressures in spec to prevent this but failed cycling switches and or overcharged or undercharged Freon can also cause this. When the ac quits pop the hood and look at the ac lines, is one of them covered in ice? If so it's definitely freezing up. Finding out why is the fun part.
This is caused by the low pressure AC compressor cycling switch, it is a very cheap part and located in the larger of the two AC lines coming from the AC compressor.
You can run any car without a belt around the AC compressor, BUT it is likely to cause the compressor to freeze up you do it for to long. So if your AC compressor is operational, I wouldn't recommend it.
if the voltage to the ac clutch is not 12 volts then find the bad connection that is causing the voltage drop
shimming the clutch is not a good idea as it is not recommended
I suspect that there is water in the ac system that is freezing and causing a high pressure problem and that is why the ac is switching off
Take it to an accredited ac specialists shop for a proper diagnosis
Most likely you have a leak in the system some where and it being low on freon is causing it to freeze over. Also if the coil in front of the radiator is clogged and dirty it will cause it to freeze over. Get some coiil cleaner and clean the coil and have the AC freon checked.
If it actually is freezing up,the low pressure switch is the likely cause.It is screwed into the large ac line near the firewall,witch is the cold line.If it is not there it is in the dryer,near the firewall,or under the air filter box.Follow the ac line(large ac line/hoses)from the ac compressor untill you come to the switch,that is the easy way to locate it.This low pressure switch causes the ac compressor to cycle on and odd according to the pressure sensed from the ac low side line.When it gets really cold the pressure is lowered,and there for it will cut off,and when the pressure rises,it cuts the ac compressor back on.It would be a really good idea to check the freon in the vehicle first.If the ac system is low on freon,it will freeze up on some vehicles.
relays are ether under hood in fuse box or under dash fuse box most cars have a diagram on the cover of said box... they look like a 1"x1" cube they have 4 or 5 prongs or blades on the bottom....
the AC compressor freezes up due to a broken piston rod inside the compressor or a pump piston has come apart or the front pulley bearing has seized, have seen all three, the reason for these failures? time in use and miles, didn't I just answer this question on another post?
As a Ford dealer tech I found this was always caused by the AC compressor cycling switch, it shuts the compressor off when it reaches about 30 PSI, this prevents freeze up and saves fuel, when the system press rises again to about 42 PSI it turns the compressor back on and so on, change the switch, it is located in the low pressure line from the compressor, that is the one that gets cold.
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