Coolant Fans

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Coolant Fans

Postby M100TURBOFR » Sun 04.11.2018, 10:42

Clarification required. Wikilec article on Fans. In Test 1 2nd sentence it states "If the fans come on you....." Should it not be "If the fans don't come on you..... because in Test 2 it states "If the fans still do not come on..."

Test 1

The first step is to remove the connector from the switch on the thermostat housing and ground it directly. The fans should begin to work.

If the fans come on you either have a stuck thermostat or a bad switch.

Test 2

If the fans still do not come on, it's time to inspect fuses.

Thanks David
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Re: Coolant Fans

Postby Fredjohn » Sun 04.11.2018, 11:00

The wording is correct.
Test 1 you are by-passing the switch and thermostat, and therefore doing their job, so if either is faulty by grounding it out the fans should come on.
Test 2 then covers the still don't come on option, so the issue may not be the thermostat or switch, but something else, eg fuse or a bad wire connection.
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Re: Coolant Fans

Postby M100TURBOFR » Sun 04.11.2018, 12:54

Thanks for your reply and confirmation.
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Re: Coolant Fans

Postby M100TURBOFR » Sun 04.11.2018, 18:05

Hello again. I tested fans acc to Test 1 on my other M100 by grounding the fan switch. Fans didn't come on whereas the electric coolant pump did!!
On the other "suspect" car, neither fans nor the coolant pump come on. Fuses appear to be ok (apart from the 30 amp one which I can't access for the moment).
Have just recently changed both thermostats on the cars so I doubt if it's that. I'll have to check the wiring and earthing.
Any ideas.
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Re: Coolant Fans

Postby Brit-Car-Nut » Sun 04.11.2018, 18:44

The earthing is supplied by the wire at the sensor. If you unplug one fan, one wire should be "hot" - 12V. Remember, you do the test with the ignition off.

If neither wire at the fans is 12V, then follow the circuit back through all fuses until you find the problem.

If there is 12V, then the wire from the sensor is getting to the pump but not to the fan harness. Again, follow the circuit diagram to find the connections.
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