Went out today, just looking. I found out that the aux fan was intermittent on low speed. Sometimes it would work, sometimes it would not work. Traced the problem to the aux fan resistor down below the master cylinder. WorldPac had one in stock. Got it and now the aux fan works correctly. I don't know how this could cause my problem but it needed fixing anyway. I'll see how it does.

PaulM

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84 500 SEL (307,xxx miles)