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Heater Fan Control

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Heater Fan Control

Postby turnturn » Fri Jun 26, 2009 6:17 pm

The heater fan control in my Mu (1992) is failing.
Initially I just lost the first two speeds (of four) but now have just lost the third.
Can anyone tell me what controls this and where it is situated?
I'm guessing that it some sort of resistor pack tucked away somewhere and thought that someone could point me in the right direction.
Cheers,
Bruce.
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Re: Heater Fan Control

Postby Yarno » Fri Jun 26, 2009 6:21 pm

No idea where it actually is but they are usually around the fan barrel area as they need the air flow to keep em cool..
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Re: Heater Fan Control

Postby geeves » Fri Jun 26, 2009 7:38 pm

There was something about this on the old forum so might be worth a search
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Heater Fan Control

Postby pig75 » Fri Jun 26, 2009 7:52 pm

The resistor block is on the white box under the glove box
fan.jpg
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Re: Heater Fan Control

Postby turnturn » Sat Jun 27, 2009 11:08 am

Thanks for the replies. Will go and have a poke around under there this afternoon.
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Re: Heater Fan Control

Postby turnturn » Sun Jun 28, 2009 12:05 pm

Gidday Fellas,
I had a look at this yesterday.
For anyone else with the same problem it is easiest to get to this part by removing only the glovebox, which is quite easy to get out.
I had removed quite a few other things before I realised this.
To remove the glovebox, remove plastic hinge pins from inside glovebox. Easy to do with a pair of pliers and brute force.
Glovebox then comes out with a bit of persuasion with a screwdriver.
Resistor block is then easy to get to. Held in by two philips (or possibly posi-drive) headed screws. You may need a stubby (preferably ratcheting) screwdriver.
The connector block includes the usual springy catch arrangement to remove it from the heater unit.
It would be nearly impossible to remove this item without going through the glovebox opening.
Here's a couple of images that you may find useful.
Dash 1.jpg
Dash 2.jpg

Sorry about the quality of the images, they're only from my phone.
Cheers,
Bruce
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Re: Heater Fan Control

Postby mulover » Sun Jun 28, 2009 3:48 pm

Good photos Bruce, When mine gave up, I took it into Holden and they said there was 2 that it could be, and they both had to be ordered in, and if it wasn't the right one then i would still have to pay for it!!! I got a later model one out of a bighorn or wizzard that is a newer and better design, but the wires are arranged differently. Sorry I can't tell you what year or model. I had to re-wire the plug which was alot of trial and error, but its working good now.
Oh how i miss my mu, the lux is just not the same :(
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Re: Heater Fan Control

Postby muzila » Tue Jun 30, 2009 7:49 pm

Strangley enuff thats not the heater. Thats the air conditioning box. The actual heater is the next box along to the right (middle of the dash). And the fan blower is to the left of this. I only no this because I took my aircon out ages ago but left that bit in my truck. I only got round to pulling it out last weekend. What a mission!!!!! If anyone is going to take theres out for repair or removal be aware that there is a 12mm nut above the center of that box against the firewall. AND you need small hands and a good socket extention to get in there.
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Re: Heater Fan Control

Postby mulover » Tue Jun 30, 2009 7:54 pm

The resistor is mounted in here to help keep it cool, as they develop alot of heat when in use.
Oh how i miss my mu, the lux is just not the same :(
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Re: Heater Fan Control

Postby stardog » Thu Jul 29, 2010 11:00 am

Hi guys my mu has the same problem only works on full speed tried local auto shops they all said have to go to holden spares haven't had a chance yet just wondering about the price of these anyone know roughly the cost for a new one.
cheers stardog
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Re: Heater Fan Control

Postby pig75 » Thu Jul 29, 2010 2:15 pm

Just get one from the wreckers from a rodeo
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Re: Heater Fan Control

Postby turnturn » Thu Jul 29, 2010 7:39 pm

I got a new one from the local Holden/Isuzu dealer. It was for a slightly later model but I got it to fit and work.
Sorry I cant remember the exact price but I can remember that it wasn't excessive.
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Re: Heater Fan Control

Postby stardog » Thu Jul 29, 2010 7:53 pm

I rang suttons holden late this arvo quoted me $175.00 if it is the right part looks like im of to the wreckers for one.
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Re: Heater Fan Control

Postby turnturn » Thu Jul 29, 2010 8:08 pm

When you go to the wreckers and get one out have a good look at it. If it is the older style they have a series of small coils/resistors (a bit like a big version of the filament in a light bulb), make sure that these are all intact. I think that there are three or four that are used in various combinations (or in series, can't remember) to control your fan speed.
The newer style are done with a series of resistors. The reply above by Pig75 shows the information required to test this type.
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Re: Heater Fan Control

Postby pig75 » Thu Jul 29, 2010 8:44 pm

If you can find a non air con rodeo the resistor should have had less use than a air con version
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Re: Heater Fan Control

Postby stardog » Thu Jul 29, 2010 9:10 pm

will do thanks for the help guys.
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Re: Heater Fan Control

Postby stardog » Tue Aug 17, 2010 7:31 am

Back to square one just blown the resistior again for the fan this is the second one from wreckers both of them were good got me stumped now i only got number 4 working again flat out just as well glove box is easy to remove.
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Re: Heater Fan Control

Postby pig75 » Tue Aug 17, 2010 7:51 am

The fan motor might be on it's way out. drawing too much current
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Re: Heater Fan Control

Postby stardog » Tue Aug 17, 2010 8:17 am

Hi pig i have just been googling and found out that water gets into the fan motor from under window screen and seizes the motor bearing and puts to much load on the resistor and blows it in rodeos i will have a look today and get back to let you all know if the mu has the same problem.
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Re: Heater Fan Control

Postby stardog » Tue Aug 17, 2010 10:17 am

Yep has had water in there before gave a good spray of wd40 and blew it out with air compresser see how it goe's with anothor resistor when i get one.
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