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Author Topic: A/C fan staying on.  (Read 1774 times)

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Pete Elite

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A/C fan staying on.
« on: 27 September 2009, 03:32:49 »
Due to my driver's side A/C fan coming on as soon as i switch the ignition on even with A/C turned off I've pulled the 30amp fuse to stop it :(.

 Does anyone know what would be causing this, my MOTer said it may have something to do with a sensor, could he be right?
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RobG

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Re: A/C fan staying on.
« Reply #1 on: 28 September 2009, 16:32:01 »
Stuck relay in eng. compartment :-/
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Pete Elite

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Re: A/C fan staying on.
« Reply #2 on: 29 September 2009, 00:40:48 »
Thanks Rob,
                   I've already asked on here for some relays, hoping that is the problem :).

 If it's not a relay, any other ideas :).
« Last Edit: 29 September 2009, 00:42:15 by scooby »
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Pete Elite

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Re: A/C fan staying on.
« Reply #3 on: 31 October 2009, 01:00:52 »
OK I've changed all the Fan relays(thanks to MarksDTM for sending me them)but problem remains :(.

Has anyone got any ideas as to why this A/C fan stays on all the time, A/C on or off, engine running or not :question.

               Thanks,
                          Pete :).
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Pete Elite

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Re: A/C fan staying on.
« Reply #4 on: 31 October 2009, 20:26:51 »
Quote
OK I've changed all the Fan relays(thanks to MarksDTM for sending me them)but problem remains :(.

Has anyone got any ideas as to why this A/C fan stays on all the time, A/C on or off, engine running or not :question.

               Thanks,
                          Pete :).


       Anyone :(.
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Pete Elite

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Re: A/C fan staying on.
« Reply #5 on: 02 November 2009, 00:52:25 »
Quote
Quote
OK I've changed all the Fan relays(thanks to MarksDTM for sending me them)but problem remains :(.

Has anyone got any ideas as to why this A/C fan stays on all the time, A/C on or off, engine running or not :question.

               Thanks,
                          Pete :).


       Anyone :(.


          Anyone please :(.
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Ziad

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Re: A/C fan staying on.
« Reply #6 on: 05 November 2009, 03:28:24 »
Pete, just wanted to ask ... have you tried to swap the connections of the front 2 fans and see if it makes any difference?

Since the fan has leccy to it, fuses are fine and relays have been changed ... this makes me suspect a *maybe* faulty fan ... swapping the connections will prove that, if the same fan is running whilst it is connected with the other fan's connection, there would be something wrong with the fan itself. HTH  :y
« Last Edit: 05 November 2009, 03:32:20 by ziad »
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Dave DND

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Re: A/C fan staying on.
« Reply #7 on: 05 November 2009, 07:55:23 »
Showing my Omega ignorance here, but generally this is what I would try on any other marque

I`d be looking to unplug and disconnect any water temperature sender units, or block sender units to see if any of those has a difference. If it does, identify the sender with a view to replacing it.

Are you sure its an A/C problem, and not simply a cooling fan that is coming on because it thinks the engine is overheating?

 :-/
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Pete Elite

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Re: A/C fan staying on.
« Reply #8 on: 05 November 2009, 23:42:49 »
Quote
Pete, just wanted to ask ... have you tried to swap the connections of the front 2 fans and see if it makes any difference?

Since the fan has leccy to it, fuses are fine and relays have been changed ... this makes me suspect a *maybe* faulty fan ... swapping the connections will prove that, if the same fan is running whilst it is connected with the other fan's connection, there would be something wrong with the fan itself. HTH  :y

 Hi Ziad,
           No I've not thought of doing this but will try it and see, is there enough cable to swap them over do you know?

      Cheers,
                 Pete :).
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Pete Elite

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Re: A/C fan staying on.
« Reply #9 on: 05 November 2009, 23:58:31 »
Quote
Showing my Omega ignorance here, but generally this is what I would try on any other marque

I`d be looking to unplug and disconnect any water temperature sender units, or block sender units to see if any of those has a difference. If it does, identify the sender with a view to replacing it.

Are you sure its an A/C problem, and not simply a cooling fan that is coming on because it thinks the engine is overheating?

 :-/

    Thanks for your reply Dave :).
 I was assuming it's an A/C problem because the driver's side A/C fan comes on as soon as i switch on the ignition(engine running or not, A/C on or off, ECO on or off and engine hot or cold)but does stop if you remove the 30amp fuse.

  What actually operates(tells the fan to start)the fan, is it a sensor and if so where is it situated?
 I know the fan between the engine and rad. is operated by the switch under the top hose and this works fine(comes on just about 97/98 or so)but is there another switch in the rad. for the A/C fans(not seen the pass. side fan work yet)or as above is this operated by something else?

          Cheers,
                     Pete :).
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Marks DTM Calib

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Re: A/C fan staying on.
« Reply #10 on: 06 November 2009, 08:27:23 »
There is a further switch on the rad, its about 300mm below the one you have seen.
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Pete Elite

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Re: A/C fan staying on.
« Reply #11 on: 07 November 2009, 06:32:54 »
Quote
There is a further switch on the rad, its about 300mm below the one you have seen.

  Thanks Mark, I'll check it out :y.
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