I have a 2005 Jetta 2.5 and it seems like one fan runs to fast
I have a 2005 Jetta 2.5 and it seems like one fan is running to fast and one fan is not running at all, engine cooling fan that is. Just wondering if someone might know whats up. It seems like one fan is getting the power for both fans. Also my book doesn't tell me which relay works the fans.
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temp switch fail most likely. fail safe keeps fan running so engine will not overheat. temp switch will be screwed into engine block. may be cover by cover, hoses or something else but pretty easy to replace. DO COLD for the sensor is in the collant port of the engine and will leak a little when changing. Good luck hope this helps.
You are talking about the thermo electric cooling fan, its operation
is independent of the car's electical system. It is switched on and off
by the engine temperature. When you park, the engine heat soaks upward
to heat the thermostat turning the fan on. It will run until the engine
cools down and the thermostat switches it off. Quite normal operation.
Fan Relay switch is stuck open. This of course assumes your temperature
sensor is working appropriately. Which I assumed since you seem to know
that the engine is running hot.
Replace the fan relay switch. The relay switch is tripped when the temperature sensor tells the computer the engine is too hot.
Until you get the relay switch replaced, you can either by-pass the
relay switch and directly connect the fans to the battery, or turn on
your A/C ALL the time and use it at a minimum setting. This will keep
the cooling fans running at all times.
If you have removed the blower motor, Connect it to a 12 volt power supply(your battery)with some jumper wires.It should turn fast, be careful when you connect it, have a good grip on it, it will jump just a little. If it dont run fast its junk. The other 2 things
1)The fan switch
2) The resistor that slows the fan at low speeds.