'94 940 Cooling Fan not turning off

Old 05-02-2006, 05:35 AM
Thread Starter
Join Date: May 2006
Posts: 1
Default '94 940 Cooling Fan not turning off

Hey all. This is my first post here. Here goes...

The electric fan in my '94 940 is not shutting off as soon as it used
to and is draining the battery. I should point out that It does shut
off eventually, it just takes a while. The car is equipped with a bosch
ignition system. To my knowledge, the ECU uses a temp signal from the
ECT to control when the fan turns on/off. I've recently replaced the
ECT so I've ruled that out. This leaves the culprit to be a sticking
cooling fan relay, found behind the battery. It looks like this:

Is there a way to test this relay to determine if its sticking? I dont
really understand how this relay works, and any help would be really
really appreciated!!!

Thanks again!

p.s. I've already tried looking for a thermo sensor in the radiator
which might control the fan, and I dont believe my system uses one.
Old 05-02-2006, 08:42 PM
tech's Avatar
Join Date: Sep 2004
Location: Orlando, Florida
Posts: 36,351
Default RE: '94 940 Cooling Fan not turning off

I always have a tester relay to use but try looking at the wiring diagram in the link and see if it helps.
Old 05-02-2006, 08:58 PM
Senior Member
Join Date: Feb 2006
Posts: 717
Default RE: '94 940 Cooling Fan not turning off

My car had a problem that when i turned it off the front fan cotinued to run, but it got fixed by itself
Old 10-16-2017, 06:34 AM
Join Date: Sep 2017
Posts: 3

Hi! I have the same problem on my 1996 940. I already changed the ECT Sensor and the relay, an the fan is still working ALL THE TIME. I have been searching for the Thermoswitch too but didn't find it.

You solved the problem?
Old 10-16-2017, 12:24 PM
Former Moderator
Join Date: Oct 2010
Location: 37 North on the left coast
Posts: 9,929

the thermoswitches that control the fan are on the radiator manifold at the bottom of the radiator. in many configurations, the A/C also turns on the fan.
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