Fan aint working
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HCF Member
Joined: Jul 2008
Posts: 3,428
From: Pueblo, CO
Fan aint working
Radiator Fan isnt working ... its not the relay or thermostat i checked both ... idk wat s wrong trust said it may be the switch but i need a diagram... Ronj??? lol... idk where the switch is and i have to fill my stupid engine coolant everyday... DAM
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Unplug the switch on the thermostat housing. Jumper the 2 pins in the plug. Fan should now start immediately when you turn the key on.
If it does, test drive that way. If engine stays at normal temperature, replace the switch. If it still overheats you have a problem other than the fan.
If the fan does not run, unplug the fan and use 2 wires to connect it to a car battery. It should run. If not the motor is bad. If the motor is OK but it doesn't run with the thermo switch jumpered, check the fuse and relay again. The contacts in the fuse box can melt and have a bad connection.
If it does, test drive that way. If engine stays at normal temperature, replace the switch. If it still overheats you have a problem other than the fan.
If the fan does not run, unplug the fan and use 2 wires to connect it to a car battery. It should run. If not the motor is bad. If the motor is OK but it doesn't run with the thermo switch jumpered, check the fuse and relay again. The contacts in the fuse box can melt and have a bad connection.
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Joined: Sep 2007
Posts: 9,453
From: Houston, Texas
Where is the lost coolant going? Have you located a coolant leak? Is your radiator cap faulty?
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HCF Member
Joined: Jul 2008
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From: Pueblo, CO
it pours out of my coolant reserve tank thing and the cap fits tight
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When the engine overheats it will do that. It's kind of a chicken versus egg problem to see if that was a cause of overheating or an effect.
If the radiator is becoming empty though the engine has not overheated, this means a problem with the coolant recovery system: the radiator cap, the hose to the bottle, and the part that goes down to the bottom of the bottle. An air leak anywhere will let coolant leave the radiator but not return. The cap may "fit tight" but if there's a crack in the rubber seal around the outside it isn't going to work.
Or there is a leak in the engine (e.g. head gasket) allowing combustion gases to enter the coolant paths and push the coolant out of the radiator.
If the radiator is becoming empty though the engine has not overheated, this means a problem with the coolant recovery system: the radiator cap, the hose to the bottle, and the part that goes down to the bottom of the bottle. An air leak anywhere will let coolant leave the radiator but not return. The cap may "fit tight" but if there's a crack in the rubber seal around the outside it isn't going to work.
Or there is a leak in the engine (e.g. head gasket) allowing combustion gases to enter the coolant paths and push the coolant out of the radiator.
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Joined: Sep 2007
Posts: 9,453
From: Houston, Texas
First fix the radiator fan problem by doing the troubleshooting suggested by mk.
If the engine continues to overheat and to spill coolant from the reservoir, you'll need to consider a faulty thermostat or radiator cap. What test did you do that made you conclude that the thermostat is fine? By the way, bleeding the cooling system of trapped air would also be worthwhile.
If the engine continues to overheat and to spill coolant from the reservoir, you'll need to consider a faulty thermostat or radiator cap. What test did you do that made you conclude that the thermostat is fine? By the way, bleeding the cooling system of trapped air would also be worthwhile.
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