This was a post on Saturnalia:
Mine is a '98 SL1 with standard transmission and about 107K miles. I noticed today that when starting a cold engine and letting the car sit stationary with the A/C on, the cooling fan runs for a minute or two, and the A/C works fine. After the engine begins to heat up, the cooling fan and A/C both cut off. The cooling fan doesn't come back on, but the A/C switches on and off a few times for shorter durations each successive time until finally it stops completely unless I get the car above 20 to 30 miles per hour. At first I thought the computer simply was cutting the A/C off as the engine got too hot, but as long as the car is moving over 20mph or so, the A/C will come on regardless of how hot the engine is. Also the first time the A/C cuts out, the temp gauge shows the needle just under the 1/4 mark. It seems to me that the A/C cuts off because the fan cuts off and has nothing to do with the engine temp.
I, too, have checked fuses, tried "wiggling wires, " cleaning electrical connections, and swapping relays to no avail. I'm going to pull the fan/motor assembly out in a few minutes to test it directly. I'll let you know what I find out. If you (or anyone else) come up with anything, please let me know. Thanks!
Tuesday, June 21st, 2011 AT 11:27 PM