IIRC, one of the fans on the non-9C1 model is higher output than the other fan (the 9C1 has two high output fans) The AC-on condition may cause the higher output fan to turn on which may be shorting out and shutting down or doing something else strange (bad relay or maybe tripping a breaker if it's not on a fuse). Something to think about as Z suggested.
I had something funky going on with my fan years ago...I think the motor was wearing out, causing the fan blades to rub on the shroud. As I have the two high output fans on my car, I simply used my Powrtuner to swap the parameters for the fans around so the squeaky one didn't come on unless the temperature got really high and the other fan became the primary. That was a quick and dirty fix until I could get around to getting a new assembly in.
If you end up going aftermarket, the Dorman fans should have a LLT warranty, and I believe the motors themselves are individually replaceable down the line if one of them craps out. If you know someone with a tuner that could help you diagnose the problem as well.
_________________ 2001 Galaxy Silver 9C1 w/ L67 and 4T65E-HD...and a few other mods.
I showed up here today to ask a question about the same thing, I'm having an similar issue with my wife's 2003/3.4L.
When the A/C is on the 2nd fan (passenger side) turns on for a few seconds and then shuts off, the temperature continues to climb as long as the A/C is on. How is this fan supposed to operate normally? I thought when the A/C is on that fan was supposed to stay on continuously, is that correct?
Chevy_Rick were you able to fix your problem or figure out what was causing it?
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