Ken, Check and clean the fan ground wire. If the ambient temperature is high and the car is heat soaked, you have reduced the circuit breakers capacity. The breaker trips when the bimetal strip reaches a certain temperature. Bypassing the breaker will not hurt the car or your fans, since the fan circuits are protected by the fuses in the fan zilla. Do a search of the achieves for "Fatal Flaw". I had the same problem with my breaker. If you take the breaker out of the circuit, the Fan zilla will now work properly and light the "fan fail" indicator if you blow a fuse. Scott Mueller 002981 DOA 5031 -----Original Message----- From: Montgomery, Ken [mailto:kenm@xxxx] Sent: Sunday, September 01, 2002 11:37 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Constant tripping of the cooling fan breaker 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.