Quote:
Originally Posted by Arthur Dalton
...the high will only have a demand when the coolant temp reaches 105C and the low only gets a demand when the a/c high side pressure gets dangerously high ... That is why they are AUX FANS, They come into play when a taxing condition presents itself. A quick test in your case is to simple turn key ON and pull the 2 wire connector off the blue sensor on the termo housing...that will default the ACC Panel to High Fan, verifying that circuit as OK.
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Your explanations have probably helped a whole generation of MB DIYers by now. Thanks. By installing Jim F's Cool Harness on the thermo sensor, I guess all I'm doing is putting a second identical thermistor in series with the existing CTS, and that's enough added resistance to lower the temp threshhold for fan activation. Is that about it?