Quote:
Originally Posted by eatlead
Hi guys,,,BTW...how do I wire the ac condensor fan to come on when the ac is on?...it appears that my ac-fans only turns on when engine coolant reach upper limits?...I d like to modify the fan so it comes on when ac is turned on full time...also where is the ac condensor fan thermo-switch located..??
my car is a 1991 300SE (w126)
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Easiest way would be to run a wire from the + line @ the compressor to a simple 12V relay setup at the condenser fan.
A simple 4 pole switch will have contacts labeled 85, 86, 87 & 30.
30 is the power supply to the thing you want to run +12V
87 is the thing you want to run (the fan) which is then wired in series to ground
85 is ground
86 is where you'd run the wire from the compressor to.
Thermoswitch is on the reciever drier.
The problem is, at highway speeds, that spinning fans are probably going to cause an airway obstruction, as the wind will be spinning them faster than the motor allows. It's better to buy a fan controller that shuts off at a certain speed; of course, you could always just give it a try - a simple relay like that costs about $5, and if you mainly sit in traffic you probably won't have a problem.
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Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.
