Quote:
Originally Posted by Air&Road
The proper temp switch in proper working order along with a properly charged system should handle the aux fan properly. The purpose of the aux fan is not for engine cooling. It's purpose is to prevent excessive high side pressure.
Hope this helps.
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I know it's only job is to kick the fan on when the head pressure builds like when idling or in traffic but I have noticed it waits way too long to do so. When it's 100 outside and my vent temps climb to 65 degrees, it has waited too long and the head pressure is I'm sure very high. I was going to get one of those adjustable fan controllers and stick the probe on the liquid line out of the condenser but I heard there are lower temp/ pressure switches from later benz's that are good for this. Or adding resistors to the switch to trigger the fan relay sooner.
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect
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