I'm having the same problem. It started last week when I couldn't get the fan to come on at all. It came back after a few minutes luckily. Not fun in the San Fernando Valley at 106 degrees, and I'm sure worse in PS.

My guess is tha the fan motor is on it's way out.

Craig

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1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.