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Old 08-07-2006, 02:01 PM
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Join Date: May 2004
Location: Columbus, OH
Posts: 17
400e aux fan / AC trouble

Having some cooling troubles - aux fans never run. I shorted the connector at the sensor screwed into the front of the engine and hear the relay activate, but no voltage at the connector plug leading to the fans just behind the driver headlight. I removed the fans and tested them - both working fine. I read on one of the numerous cooling threads that someone found a fuse inline between the relay and the fans, although I've been unable to find such a fuse (ABS unit removal is less than appealing). The fuse in the fuse box is of course fine. That's problem number 1. Problem number 2 is that after I reinstalled the fans, the AC now blows warm air (worked before). Compressor doesn't activate. I took care not to damage the radiator or condenser when working on it, and the AC system still has plenty of charge. Only thing I can think of is maybe the aux fan relay is bad even though it "sounds" like it works, and maybe I fouled up some of the AC wiring - can't see how I could have. Any suggestions would be most appreciated!
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