Thanks for the responses.

Matt, I believe this is a cycle system.

Mr. Dalton, thanks for the post. I doubt the system is overcharged. When I replaced the evap a few years ago, correct refrigerant quantity was added based on scale weight--nothing has been added since, and the ac has been problem free for two years.

Evap temp sensor is fairly cheap and easy--think I'll try that first.

Thanks again.

J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles