Radiator fan always runs when raining at idle
I've noticed when ever it's raining the radiator fan will run when idling at a stop whether the engine is hot or cold. Soon as you start driving the fan will shut down. Nothing seems to change this behavior like fluid temp, A/C on or off, heat, wipers, lights... The fan is pretty quite so you won't hear it spool up or down if the radio is on or people talking. It happens every single time is raining.
I can only think I either have a short caused by the water but if that was the cause I'd think the fan would always run and not shut down once the car is moving. Or, this is some programmed logic I don't understand, perhaps to keep the engine/belt dry or the radiator clear of water droplets. Anyone else notice this?
Update: I've given this a lot of thought and nothing makes sense except for a short on the A/C pressure transducer as the fan should have the same behavior if the A/C was on. Or what ever sending unit controls the fan with the A/C compressor is on, guessing it's the transducer. Guess I'll have to pick a nice rainy day to bring it to the dealer so they can reproduce it, which is slim pickings here in California.
'14 Citadel AWD 3.6L Sandstone/Tan
Tech, Tow, Captain Chairs