In May, I left a post that my AC cooled fine but after some indeterminate time, and especially after running 60 mph or above for ten miles or so, the cooling would stop. If I stopped, cut off the ignition and restarted the car, the cooling would resume. I have checked out every suggestion I got, but still no answer. Any ideas about this, let me know. It is HOT in Texas

Mine did something very similer last year. It would work fine for a bit then the compressor would cut out. If I restarted the car it would work again.

In my case it was a bad push button unit. Actualy the second head unit I stuck a used one in there and it lasted about a month. So insted of going with another used one I bought a rebuilt one and its working fine.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Typically, when the compressor drops out for no reason, the problem is one of the signals to the Klima or the Klima relay itself. There are some elaborate troubleshooting procedures to find the culprit, but, if it only drops out after 60 minutes of driving, you'll be unlikely to find it in your driveway.

It's normal for the system to reset the Klima when cycling the ignition after the Klima has dropped the compressor out.

As Hattie mentioned, the CCU is not ruled out from this scenario, although, my guess is that it's less likely to be the culprit if you're able to go for 60 minutes without dropping the compressor.

If you wish a quick and dirty solution, you can rig up an external ice cube relay and bypass the Klima altogether. However, you lose the protection of dumping the compressor if it locks up for any reason. It will then shred your only belt in short order unless you're very astute as to what's happening and get the clutch disengaged very quickly.