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Volkswagen EuroVan: 1992-2003 (T4) Coolant fans run continually as soon as ignition switch is turned on.


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Last Post: Jan 18, 2013 9:51 AM Last Post By: Indian
masonmck

Posts: 1
Registered: 04/20/04
Coolant fans run continually as soon as ignition switch is turned on.
Posted: Apr 20, 2004 5:29 PM
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I would like help troubleshooting the following problem.

As soon as the ignition switch is turned on, both coolant fans come on at full speed. This happens even when the 15amp coolant fan fuse under the steering wheel is removed.

It does not happen when the "Blower" fuse is removed. If I run the vehicle to operating temperatures with this fuse removed, the coolant fans will come on at normal intervals to cool the engine (even if the car is turned off). WHen the blower fuse is installed, the coolant fans run all the time, even if the blower motor is turned off.

I am thinking/hoping there is simply a relay that is malfunctioning that somehow effects both the coolant fans and the blower. Or perhaps a short that grounds the coolant fans into the blower circuit...

THis problem sounds similar to one posted by 'bustedeuro'.

Thanks, Mason
TomB

Posts: 1,416
Registered: 08/06/02
Re: Coolant fans run continually as soon as ignition switch is turned on.
Posted: Apr 23, 2004 2:15 PM   in response to: masonmck in response to: masonmck
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The A/C control does also have a wire that ties into the coolant fan circuit, so that (assuming this is a 93 model) fuse S19 (30A) provides power to the coolant fans when the J301 A/C controller activates it's thermostat to turn on the compressor. Sounds like your problem is in this area.
Danatisy

Posts: 4
Registered: 12/21/06
Re: Coolant fans run continually as soon as ignition switch is turned on.
Posted: Sep 16, 2012 10:51 PM   in response to: TomB in response to: TomB
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Radiator thermoswitch needs to be replaced. Depending on what your EV is equiped, you will have to choose among 4 types of switches.
Szaki

Posts: 2
Registered: 01/17/13
Re: Coolant fans run continually as soon as ignition switch is turned on.
Posted: Jan 17, 2013 4:30 AM   in response to: Danatisy in response to: Danatisy
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I have the same problem on my 93' EV MV, coolant fans running soon as I turn the ignition on.
Is there any way to test the 3 wire rad temp sensor, resistance etc...?
I all ready replaced the G62 temp sensor, 2 wire/blue (it was recommended), turned out the old was OK.
Cost $18.
I had car at Good year, but they could not fix it.
Thx!
Indian

Posts: 222
Registered: 01/17/07
Re: Coolant fans run continually as soon as ignition switch is turned on.
Posted: Jan 17, 2013 7:52 AM   in response to: Szaki in response to: Szaki
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Under the radiator you will see two resistance coils. That needs to be replaced. Thats what I did to mine. The coils alone were cheap but the holder cost me much more. These coils can be removed without removing the holder.
Szaki

Posts: 2
Registered: 01/17/13
Re: Coolant fans run continually as soon as ignition switch is turned on.
Posted: Jan 17, 2013 10:42 AM   in response to: Indian in response to: Indian
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THx!
I did the pin test on the rad fan sensor plug, 3 pin on the side of the rad, I get high and low speeds on both fans.
Means resistor pack is good.
Do you agree?
Indian

Posts: 222
Registered: 01/17/07
Re: Coolant fans run continually as soon as ignition switch is turned on.
Posted: Jan 18, 2013 9:51 AM   in response to: Szaki in response to: Szaki
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What about testing or replacing the fan activating switch on the radiator?

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