The Aux goes on at 240 or so mine came on once when main fan relay went bad.
Vigman could you explain the AC pressure turn ons. I was not aware the fans were controlled by pressure. Would there be any problem with the inceased pressure when 134 freon is used?
OK dumb question time. My aux fan isn't coming on. I've swapped the relay with a known good relay, and it still isn't coming on. I've located the sender on the head with the green/white wire. Upon inspection though, I'm not sure how to remove the connector. I've tried pulling it, and pushing the sides in to compress it inside, but it's still not giving. I'd rather ask the dumb question then screw up the plug. Also, Vigman, is it safe to assume the color codes you mentioned earlier in the post for troubleshooting apply for an '89 as well ?
Well maybe the fan control system is different for the earlier C4's, but with my 92, I put in the manual fan switch, and I can operate the fans at any time,I can either operate one fan or both fans, but I do beleive the 88's only have 1 fan,I may be wrong though.anyway,If you install the fan switch You should be able to turn the fan on when power is passed to the switch, while engine running or not,unless 88's are very different setups then 92.