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Old 09-17-2013, 04:50 AM
MAKDUFF3 MAKDUFF3 is offline
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Join Date: Aug 2013
Location: San Antonio, Tx.
Posts: 72
Quote:
Originally Posted by marco5 View Post
I went on a long drive, uphill with a/c on, as soon as it hit 59-64 i heard the fan click on and run. Happy this is over, now onto the next issue! LOL

Thanks so much for your help. There were a LOT of misleading posts with this switch, some people say it runs of coolant temp, others say ONLY when A/C is on should it run. That is all false.

This runs simply runs of the temperature at the a/c dryer regardless of the A/C system being on or not.

I disagree. Look at your wiring diagram you should see that either the water temp sensor and/or the refrigerant temp sensor on the dryer can actuate the relay to turn on the aux fan which does it first is a matter of resistance...
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MAKDUFF3

1975 300D, Feuerrot and Parchment interior

1971 220D (RIP)
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