Can't help noticing how frequently the fan clutch is mentioned in response to overheating problems. While this is certainly an important component in the cooling system, I would think that proper functioning of the auxiliary fan would also be an important consideration.

When I began working on my air conditioning system that had not worked for about 5 years, one of the first things I did was to check the auxiliary fan. It was not working and I have no idea how long it had been since it did work. Got that straightened out before doing a/c work. Now, everything is going well.

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Ted
1979 240D
165,000 miles