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Author Topic: Radiator fans  (Read 484 times)

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BazaJT

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Radiator fans
« on: 05 August 2018, 20:47:58 »

Had the Omega running while I cleaned the garage floor,after a while the rear fan kicked in and lowered temp and then kicked out again[just as it should I believe]the front fans didn't start so I set the heater control to auto and both temp settings to lo and the front fans still didn't fire up.Question is should they have done so? Or if the gas is low/empty would they not start up?Air coming out of interior vents was colder than outside air but not cold cold.
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Doctor Gollum

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Re: Radiator fans
« Reply #1 on: 05 August 2018, 22:24:22 »

As per my other...

Was Eco button pressed?
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Andy H

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Re: Radiator fans
« Reply #2 on: 05 August 2018, 22:44:27 »

The refrigerant circuit has a pressure switch that stops the A/C working if there is insufficient gas in the system.

Checking if the ECO button is pressed is easy. To check the gas pressure requires a set of pressure gauges.

IIRC the front fans run at half speed whenever the A/C is working and only switch to full speed if the radiator is stupidly hot (so engine temperature gauge reading 100+)

I never seem to have an A/C system that lasts for more than 3 years before needing attention so my assumption is that yours will need re-charging :(
« Last Edit: 05 August 2018, 22:47:36 by Andy H »
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Entwood

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Re: Radiator fans
« Reply #3 on: 05 August 2018, 22:59:49 »

Autobahnstormers used to have a really good diagnostic guide to the radiator fans, I don't want to post it up here in case I breach any copyright rules, as well as it being a tad rude to nick their stuff .. but "if" you are able to access the ABS forum ..... try there ..   :)

I have a copy if ABS will allow me to do it .. I saved it as a .jpg .. :)

Gives jumpers and tests to check every fan under every condition


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Bigron

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Re: Radiator fans
« Reply #4 on: 05 August 2018, 23:14:02 »

I've seen that on here before, Nige: either someone else (Keith?) posted it, or it's in the Guides.

Ron.
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Andy B

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Re: Radiator fans
« Reply #5 on: 05 August 2018, 23:23:24 »

Autobahnstormers used to have a really good diagnostic guide to the radiator fans, I don't want to post it up here in case I breach any copyright rules, as well as it being a tad rude to nick their stuff .. but "if" you are able to access the ABS forum ..... try there ..   :)

I have a copy if ABS will allow me to do it .. I saved it as a .jpg .. :)

Gives jumpers and tests to check every fan under every condition

IIRC someone else gave the ABS permission to use it  :y
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LC0112G

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Re: Radiator fans
« Reply #6 on: 05 August 2018, 23:46:51 »

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BazaJT

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Re: Radiator fans
« Reply #7 on: 06 August 2018, 07:28:18 »

I did try it with eco showing on the display[it was what it was already set to]and then without eco showing and there was no change.A couple of years ago I tried the fan test using the little socket near the battery and all fans behaved as they should,probably have to give that test another go,both the front fans are free to move as I could[engine off obviously]spin each one manually.
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Doctor Gollum

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Re: Radiator fans
« Reply #8 on: 06 August 2018, 07:33:22 »

Eco on = aircon off = no front fans...

... Unless it's half a degree from blowing coolant everywhere  ;)

Could be a sticky/duff relay/fuse...

That said, if the fans don't work then the aircon compressor won't engage... And if the aircon doesn't work, then the front fans won't run. All of which makes testing everything a bit of a faff.

Fan test here...

http://www.omegaowners.com/forum/index.php?topic=133825.0 :y
« Last Edit: 06 August 2018, 07:39:31 by Doctor Gollum »
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BazaJT

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Re: Radiator fans
« Reply #9 on: 06 August 2018, 07:46:41 »

Likely scenario then is that lack of gas means aircon not working therefore fans don't,does that sound about right?
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Doctor Gollum

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Re: Radiator fans
« Reply #10 on: 06 August 2018, 07:47:56 »

It's possible but doesn't exclude a fan issue ::)
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BazaJT

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Re: Radiator fans
« Reply #11 on: 06 August 2018, 07:50:52 »

Another pointer perhaps[this has just occurred to me]when I pressed auto button-eco off-there was no momentary "dip" in the revs,does this suggest that the compressor didn't engage?
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Doctor Gollum

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Re: Radiator fans
« Reply #12 on: 06 August 2018, 07:55:25 »

Easily confirmed by looking ;)
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Keith ABS

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Re: Radiator fans
« Reply #13 on: 06 August 2018, 08:02:48 »

 There wont be a problem from Autobahnstormers if used here

Keith ABS
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Doctor Gollum

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Re: Radiator fans
« Reply #14 on: 06 August 2018, 08:15:12 »

Easily confirmed by looking ;)
Although it will only tell you if the clutch is engaging, or not... And not why it isn't working... Which could be a fan issue as much a gas one...
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