Fan speed resisitor GQ

Submitted: Sunday, Mar 16, 2008 at 17:20
ThreadID: 55595 Views:2695 Replies:5 FollowUps:8
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Hi.
Has anyone ever replaced the heater fan speed resistor on a GQ Patrol?
The fan will only run at the highest speed, the other settings are dead. I believe it is probably the speed resistor and I need to fix it for a RWC. (Why it would fail a Road Worthy is beyond me!).
I have taken apart the dash, got into the speed setting switch, but no resistor. I've also taken out the glove box, looked behind the fan motor.... no resistor!

Does anyone know where the bloody hell it is?????

Is it fixable or must it be replaced?

Your help is so appreciated!
http://geocities.com/metafinite2001/GQ_patrol
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Reply By: Dunaruna - Sunday, Mar 16, 2008 at 17:31

Sunday, Mar 16, 2008 at 17:31
It's mounted in the front of the heater box assembly, a square block held in with 2 screws.

If you're in victoria, give Patrolapart a ring, they have secondhand ones cheap.
AnswerID: 292943

Follow Up By: Neilo - Sunday, Mar 16, 2008 at 17:36

Sunday, Mar 16, 2008 at 17:36
There is a small box attached with 2 wires going in. Is that the one?
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FollowupID: 558564

Follow Up By: Dunaruna - Sunday, Mar 16, 2008 at 17:40

Sunday, Mar 16, 2008 at 17:40
Nope. It has a 4 wire square plug.

Can you post a pic?
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FollowupID: 558566

Reply By: donk - Sunday, Mar 16, 2008 at 17:33

Sunday, Mar 16, 2008 at 17:33
I haven't any experience with gq's but on the older toyota's of the same vintage it is normally positioned in the duct behind the glovebox between the fan motor & the heater housing (if a/c is fitted it is in the evaporator housing that replaced this duct) & in my gu workshop manual it showes it just to the rear & the side of the fan motor

It should be a plastic housing held in to the ducting with a self tapper or 2 & have a wiring plug going to it with probably 3 or 4 wires

Your diagnosis sounds correct as when the resistor fails you normally lose all speeds except for high

Good luck

Regards Don
AnswerID: 292944

Follow Up By: Neilo - Sunday, Mar 16, 2008 at 17:37

Sunday, Mar 16, 2008 at 17:37
Thanks. There is a small box mounted there but only with 2 wires, surely this cant be right?
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FollowupID: 558565

Reply By: donk - Sunday, Mar 16, 2008 at 17:47

Sunday, Mar 16, 2008 at 17:47
A resistor normally has more than 2 wires going to it (it depends on how many fan speeds the vehicle has)

The resistor looks like a flat plastic housing with the wiring plug on one side & the resistor coils on the other (how many coils depend on how many fan speeds it has)

The coils are normally exposed to the airflow inside the housing that the resistor mounts into but some later (toyota anyway) resistors have the coils enclosed in a white solid substance (possibly a hint sink material)

This web site may be helpful to you as it has a dedicated gq forum

http://www.patrol4x4.com/forum/index.php

Resistors are normally fairly obvious to locate


Good luck

Regards Don

AnswerID: 292948

Reply By: donk - Sunday, Mar 16, 2008 at 18:06

Sunday, Mar 16, 2008 at 18:06
maverick22
This is probably better answered by our Res auto spark. But anyway passanger side behind glove box is the air/con condenser box (plastic) facing you is a metal panel 100mm x 50mm with a wire coming out the top three screws to remove behind panel is your resistor bank to do the 3 speeds one of the wires will be broken best to buy a new one or go to the wreakers. This is for the OEM air/con some Mav were supplied with non OEM condenser boxes it is nearly the same just located on the side have to remove sys to see anything.
__________________

This was on the patrol forum regarding a maverick but it will be the same as a gq
Have a read & see if it makes any sense with what you are looking at in yours

Regards Don
AnswerID: 292951

Follow Up By: Neilo - Sunday, Mar 16, 2008 at 19:25

Sunday, Mar 16, 2008 at 19:25
Yes makes perfect sense!
I actually did open that panel earlier today, but was'nt sure what was going on inside. All I saw was a couple of connectors.
Its gotten dark out now, so i will tray again tomorrow.

Thanks for that Don! Ill let you know how I go.
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FollowupID: 558578

Follow Up By: Neilo - Monday, Mar 17, 2008 at 10:44

Monday, Mar 17, 2008 at 10:44
Great advice Don!
I found the little bugger, got him out, took him apart and after doing a bit of descaling of the green gunk that had accumulated on the resistor coils, I found that the coils themselves were perfectly intact. What appeared to have come loose was a tiny wire that is connected to what I think is a thermostat arm.
The coils get very hot when the fan is running at anything below max speed, hence the need for the ventilated steel box around them and the fact they are mounted reight in the path of the moving air!
All I had to do was solder a bit of twisted copper wire to the two points and hey presto! it works! Saved my self a trip to the wreckers and $$$ in replacements.
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FollowupID: 558707

Follow Up By: Neilo - Tuesday, Mar 18, 2008 at 21:45

Tuesday, Mar 18, 2008 at 21:45
Tried to get some pics up, but failed. Try again...
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FollowupID: 559091

Follow Up By: Neilo - Tuesday, Mar 18, 2008 at 21:47

Tuesday, Mar 18, 2008 at 21:47
Above is the little bugger, after I cleared all the green gunk...and this one shows the location of the bloody thing.
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FollowupID: 559092

Reply By: donk - Tuesday, Mar 18, 2008 at 21:53

Tuesday, Mar 18, 2008 at 21:53
I hope the green gunk you cleaned off was not the stuff that resistors have across the coils from new

I don't know why it is there but possibly to support the coils in the air flow or as a heat sink

If this is the case i don't know what effect removing it will have

Regards Don
AnswerID: 293470

Follow Up By: Neilo - Wednesday, Mar 19, 2008 at 09:45

Wednesday, Mar 19, 2008 at 09:45
Gee I hope not too Don.
It was quite brittle and crumbled easily in my fingers when handled. It wasnt covering the length of coils so it didnt seem to be supporting them.
It all works fine now and if the coil should move and short itself, the only effect would be a reduction in resistance and the fan will blow stronger. If it should burn itself out, at least I now know where the bloody thing is to replace!

Cheers,

Neil
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FollowupID: 559184

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