The things that would cause the fans to run immediatly on start-up are 1) the A/C is turned on and running (it overrides the otterstadt switch) 2) the otteratdt switch is bad. Turn off the A/C and pull the wires to the otterstadt switch. This should keep the fans from running. Put the wires back on the otterstadt switch and try again but it probably should be replaced. I would also replace the fan fail relay. A bypass is better but the Fanzilla is best. The bypass wire won't operate the fan fail light and it will eventually burn up. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "Jack Singer" <jsinger@xxxx> wrote: > New problem for me... > > When I start my D, the cooling fan goes on as soon as it starts and the fan > fail light goes on. After running for a minute it goes off and every once > and a while the fan fail flashes on and then off. After it is warmed up, > the problem seems to go away..... > > Any ideas what to look for? > > Kind Regards, > > Jack > 5823