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Old 19th June 2021, 20:53   #1
david2000
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Default cdti cooling fan

hi to all
the cooling fan on my rover 75 only comes on high speed and it has the silver resistor fitted how can i test the resistor to see if it is faulty and would replacing it with a gold resistor solve the fault
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Old 19th June 2021, 21:21   #2
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Originally Posted by david2000 View Post
... how can i test the resistor to see if it is faulty ...
With ignition on or engine running, press the windscreen demist button on your air con./heater control panel. Now walk to the radiator grille to see if your fan is running.

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Old 19th June 2021, 22:09   #3
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hi to all
i tested the fan using a t4 there was no low speed only high is the resistor at fault and would replacing the resistor to a gold resistor sort it out and low speed would return
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Old 20th June 2021, 00:58   #4
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hi to all
i tested the fan using a t4 there was no low speed only high is the resistor at fault and would replacing the resistor to a gold resistor sort it out and low speed would return
david
David yes change the silver resistor, for a gold one if the resistor is already gold then it as failed and needs replacing, there is an how to on here for changing it out.

PS make sure that the tails on the resistor have a good length of heat shrink on them, and use the original bracket to fix it to.
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Old 20th June 2021, 20:31   #5
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Jules is you're man for this. He supplies the resistor and the How-to.

https://www.the75andztclub.co.uk/for...Jules+resistor
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Old 21st June 2021, 21:15   #6
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hi to all
what if i replace the silver resistor for a gold resistor and it still does not work does that mean that the circuit board is at fault
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Old 21st June 2021, 22:34   #7
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hi to all
what if i replace the silver resistor for a gold resistor and it still does not work does that mean that the circuit board is at fault
david
HI David.
It could be but i would worry about that once you have changed the resistor, as it could be the brushes have worn, very rare i have to say on a two wire two speed resistor system, then it could be one of the relays, and all that can be thought about once the resistor as been replaced.

https://www.the75andztclub.co.uk/for...d.php?t=216734
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Last edited by Arctic; 22nd June 2021 at 16:38..
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Old 22nd June 2021, 13:28   #8
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hi to all
if it is not the resistor and it is not the relays then it has to be the circuit board is the circuit board available
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Old 22nd June 2021, 14:18   #9
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hi to all
if it is not the resistor and it is not the relays then it has to be the circuit board is the circuit board available
david
So you have changed the resistor and the relay, is that what you're saying?
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Old 22nd June 2021, 16:21   #10
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hi to all
i have a fan assembly and there is only high speed now it has a silver resistor now i want to know if i change the resistor and it still does not work i then change the relays which are available and it still does not work is the circuit board available if the circuit board is not available then it would be better to look for another working fan
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