Omega Owners Forum

Omega Help Area => Omega Electrical and Audio Help => Topic started by: Pete Elite on 27 September 2009, 03:32:49

Title: A/C fan staying on.
Post by: Pete Elite 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?

Title: Re: A/C fan staying on.
Post by: RobG on 28 September 2009, 16:32:01

Stuck relay in eng. compartment :-/

Title: Re: A/C fan staying on.
Post by: Pete Elite 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 :).

Title: Re: A/C fan staying on.
Post by: Pete Elite 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 :).

Title: Re: A/C fan staying on.
Post by: Pete Elite 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 :(.

Title: Re: A/C fan staying on.
Post by: Pete Elite 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 :(.

Title: Re: A/C fan staying on.
Post by: Ziad 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

Title: Re: A/C fan staying on.
Post by: Dave DND 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?

 :-/

Title: Re: A/C fan staying on.
Post by: Pete Elite 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 :).

Title: Re: A/C fan staying on.
Post by: Pete Elite 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 :).

Title: Re: A/C fan staying on.
Post by: Marks DTM Calib on 06 November 2009, 08:27:23

There is a further switch on the rad, its about 300mm below the one you have seen.

Title: Re: A/C fan staying on.
Post by: Pete Elite 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.