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25th March 2020, 15:27 | #1 |
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How to Test Cooling Fan relay
I now have the front off my 2003 1.8 turbo, which has a habit of running the high speed fan most of the time and running on when switched off.
As I say, having removed the shroud, I am at the stage where I want to test the relays in the "control box" and ask the question, "how do I test the relays?" The resister is the original silver one, which has continuity. |
25th March 2020, 16:08 | #2 |
I really should get out more.......
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25th March 2020, 16:24 | #3 | |
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Quote:
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25th March 2020, 17:25 | #4 | ||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Quote:
Quote:
Simon
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25th March 2020, 18:00 | #5 |
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Thanks Simon. As I have the whole of the front off I am going to work backwards again, eliminating those relays while I am there.
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26th March 2020, 07:27 | #6 |
Doesn't do things by halves
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You have already eliminated the fast speed relay since you've reported that it is turning on and off. You can test the slow speed relay by doing the 'demist test' which is why I asked about that. If you haven't already done it I recommend that you do this test now, before anything else.
The relays are very reliable. It's very rare that a forum member reports a failure but remember that if this does happen, the relay contacts stick together permanently which results in the fan running constantly. As I understand it, that isn't what you're experiencing. Don't get hung up on the relays Fred. The first thing we need to know is whether the slow speed is working. The easiest way to check that is the 'demist test'. Just a reminder that the engine needs to be running. Simon
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