You probably have a cooling fan going bad. Not a good idea to jump the breaker as the wiring shouldn't carry more than 40 amps continuously. Could also be a bad otterstadt switch because the fans are supposed to cycle, if they don't you will pop the circuit breaker too. Check that the fans do indeed cycle on and off and make sure the fans are not loose on the shafts of the motors and that both motors are blowing in the correct direction. I am assuming the motor isn't running too hot? If you have the old syle pipe for the otterstadt switch modify to the later style. A Fanzilla cannot correct problems in the cooling system, it is only an upgrade for the Fan Fail Relay. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "Montgomery, Ken" <kenm@xxxx> wrote: > Hi gang, > > I've come across a problem I've not been able to solve. The circuit breaker > to the cooling fans keeps tripping when the air conditioner or the otterstat > has them switched on. It happens after the car and fans have been running > for a while and the breaker has become hot. I thought I may have just had an > old or defective breaker (40 amp) but the replacement does the same thing. I > have a FanZillia, the fuses on it are holding and both fans turn easily. Why > are they drawing so much current? I'd just jump the breaker and rely on the > fuses but That's just not a good answer. > > Does anyone have any suggestions? >