89 300TE A/C works great for 15 to 20 minutes then shuts off. If I turn the engine off and wait 2 or 3 minutes and restart, A/C will run again for 15 to 20 minutes then shut off again. I am thinking its the pressure switch next to the drier. Any ideas????????? Its getting hot

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'05 Ford Escape 100,000 miles
'87 560SL 92000 miles
'89 300TE 199,000 miles
'02 Audi TT 100,000 miles
'00 Ford Excursion V-10 121000 miles
'92 Mercury Capri 100000 miles
'02 BMW 325XI 60000 miles
'92 230CE 160000
'87 BMW 535SI 160,000 miles
'93 Rinker Captiva 209
5 Kids
2 Dogs
1 Wife