I've noticed that my 2006 Saab 93 will occasionally turn the cooling fan on after I've parked it and shut the engine off. It only does this on hot days, and the fan only runs for 10-20 seconds. This appears to be normal operation based on what the service manual says. I expect in the case of the Saab this helps the water-cooled turbo cool down.
The only other car I've ever owned that had the cooling fan come on after the engine was shut off is a 1986 Dodge Omni, which isn't the turbo version, and I always figured that the reason why is that the fan temperature switch is wired that way to save a few cents on wire.
But now I'm thinking there may have been a reason for it. Does it help engine longetivity?
Neither the Ford Escort nor the Ford Contour ever turned their cooling fans on after the engine had been turned off..I don't think they are capable of that (they use the engine coolant temperature sensor to control the engine cooling fan, and the engine computer is OFF when the key is off. The Saab 93 is not like that--the engine computer on that goes to "sleep" several minutes after the key is turned off).
The only other car I've ever owned that had the cooling fan come on after the engine was shut off is a 1986 Dodge Omni, which isn't the turbo version, and I always figured that the reason why is that the fan temperature switch is wired that way to save a few cents on wire.
But now I'm thinking there may have been a reason for it. Does it help engine longetivity?
Neither the Ford Escort nor the Ford Contour ever turned their cooling fans on after the engine had been turned off..I don't think they are capable of that (they use the engine coolant temperature sensor to control the engine cooling fan, and the engine computer is OFF when the key is off. The Saab 93 is not like that--the engine computer on that goes to "sleep" several minutes after the key is turned off).