Thanks to both of you. I guess that's good news. I cleared the codes and I'll let you know if they come back. The bottom cover is installed, but we've been getting heavy rain and I'm wondering if some water got into the a/c clutch as the car was driven through standing water. It's tough to know what conditions it was exposed to when there's more than one driver.

As for the module box overheat, do you know if MB discontinued the fan exhaust on later models because it wasn't necessary, or was there additional venting on later models?

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles