Welcome to the Australian Ford Forums forum.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and inserts advertising. By joining our free community you will have access to post topics, communicate privately with other members, respond to polls, upload content and access many other special features without post based advertising banners. Registration is simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact us.

Please Note: All new registrations go through a manual approval queue to keep spammers out. This is checked twice each day so there will be a delay before your registration is activated.

Go Back   Australian Ford Forums > Club and Speciality Forums > Forum Community Car Clubs > AU Falcon.com.au

Reply
 
Thread Tools Display Modes
Old 25-06-2013, 01:49 PM   #31
McPants
Starter Motor
 
Join Date: Jul 2011
Posts: 6
Default Re: A/C Fan won't turn off...ever

Bernie, ive sent you a pm
McPants is offline   Reply With Quote Multi-Quote with this Post
Old 25-06-2013, 03:48 PM   #32
Bernie351
Regular Member
 
Join Date: Dec 2006
Posts: 52
Default Re: A/C Fan won't turn off...ever

Thanks mcpants
Ive done what ausblue and mcPants suggested..
Great tips and pics..

Spent last 4 hrs replacing transistor, and swapping relays...bought new soldering iron.

But same :(
Anyone else have any luck?
I spent all my cash on this car...cant afford to pay ford or auto lec
Fan doesn't stop when I pull fuse or relays.
Ive disconnected wires behind glovebox (brown plug)

ps. mine is a AU LTD V8
Bernie351 is offline   Reply With Quote Multi-Quote with this Post
Old 25-06-2013, 09:11 PM   #33
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

Any chance you inserted the transistor the wrong way around? Did you use new mica or rubber isolation washers? Check with a multimeter that there is no continuity between the transistors casing and the finned controller casing.
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 29-06-2013, 09:32 AM   #34
Bernie351
Regular Member
 
Join Date: Dec 2006
Posts: 52
Default Re: A/C Fan won't turn off...ever

I did watch the pins when I put it in, and put it in same way (pins closer to one side)
But no markings? so hard to tell?
washers? I didn't see any?
I took the old transsister to the auto lec to test...no word yet.
Bernie351 is offline   Reply With Quote Multi-Quote with this Post
Old 29-06-2013, 12:57 PM   #35
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

Quote:
washers? I didn't see any
That's the problem then.
You need insulating washers and eyelets like this otherwise the transistor will short to the fan speed controller case and fail. :

so the transistor case is electrically isolated from the case of the fan speed controller.



The eyelets are not labelled (they are the black items but the fit in the screw holes so the screws don't connect the case to the transistor. The isolating pad/washer can be mica or rubber and needs to be covered with heatsink paste so the heat but not electricity can move between the transistor and the finned case of the fan speed controller.

Mica washers or isolating pad:

__________________
regards Blue

Last edited by aussiblue; 29-06-2013 at 01:03 PM.
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 29-06-2013, 01:13 PM   #36
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

This may help http://www.youtube.com/watch?v=hNRacVQRgBc


and http://www.youtube.com/watch?v=nPpPWSrrxfM


and for some theory:

http://www.youtube.com/watch?v=8ruFVmxf0zs
__________________
regards Blue

Last edited by aussiblue; 29-06-2013 at 01:33 PM.
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 29-06-2013, 01:17 PM   #37
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

Original link was http://www.fordforums.com.au/showthread.php?t=11395945
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 29-06-2013, 01:45 PM   #38
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

Note, that if didn't use the eyelets and insulating washer/pad you will have replicated the original failure when wet leaves short the TO-3 transistor to the case of the fan speed controller (or corrode its case) and killed your new transistor.
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 29-06-2013, 01:56 PM   #39
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

TO-3 Mounting kits are available from:

Altronics: http://www.altronics.com.au/index.as...=item&id=H7200
Jaycar: http://www.jaycar.com.au/productView.asp?ID=HP1172
Element14 (Farnell): http://au.element14.com/keystone/472...tor/dp/3299776
Futerlec http://www.futurlec.com/HeatAccess.shtml
RS Components http://australia.rs-online.com/web/p...ories/0263239/ and http://australia.rs-online.com/web/p...ories/0298493/

and if you want to socket it: http://australia.rs-online.com/web/p...ories/1897912/


and heatsink paste to coat the pad:

Altronics http://www.altronics.com.au/index.as...=item&id=H1600
Jaycar http://www.jaycar.com.au/productView.asp?ID=NM2010

etc
__________________
regards Blue

Last edited by aussiblue; 29-06-2013 at 02:02 PM.
aussiblue is offline   Reply With Quote Multi-Quote with this Post
This user likes this post:
Old 29-06-2013, 02:05 PM   #40
McPants
Starter Motor
 
Join Date: Jul 2011
Posts: 6
Default Re: A/C Fan won't turn off...ever

your a wealth of knowledge blue. I don't own my Fairmont anymore, but do miss that effortless steering and 4ltr power. my new cars engine is half the size.
McPants is offline   Reply With Quote Multi-Quote with this Post
This user likes this post:
Old 29-06-2013, 02:06 PM   #41
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

and there's always eBay

http://www.ebay.com.au/itm/10-Sets-M...item20d35aa065
http://www.ebay.com.au/itm/30g-Therm...item43bbc84643 etc
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 01-07-2013, 05:46 PM   #42
Bernie351
Regular Member
 
Join Date: Dec 2006
Posts: 52
Default Re: A/C Fan won't turn off...ever

hey great work bluey
il get wifey to leave LTD at home agin and il have another try..
I bought the transistor from jcar...so will go back and get other bits and try again.

went to 2 auto lecs and big computer shop
no one knows how to test transistor??

stay tuned...I might video it for the next poor Ford owners hahh
Bernie
Bernie351 is offline   Reply With Quote Multi-Quote with this Post
Old 01-07-2013, 06:41 PM   #43
Bernie351
Regular Member
 
Join Date: Dec 2006
Posts: 52
Default Re: A/C Fan won't turn off...ever

checked the old transistor...
sure enough found the washers under the coating
Attached Images
File Type: jpg 001x.jpg (51.9 KB, 121 views)
Bernie351 is offline   Reply With Quote Multi-Quote with this Post
Old 01-07-2013, 08:57 PM   #44
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

Most multimeters these days have a transistor testing function and the specs for most transistors are available online. i.e. in this case http://www.futurlec.com/Transistors/2N5686.shtml
http://www.onsemi.com/pub_link/Collateral/2N5684-D.PDF
http://pdf.datasheetcatalog.com/data...emi/2n5685.pdf
__________________
regards Blue

Last edited by aussiblue; 01-07-2013 at 09:06 PM.
aussiblue is offline   Reply With Quote Multi-Quote with this Post
This user likes this post:
Old 08-07-2013, 10:59 AM   #45
Bernie351
Regular Member
 
Join Date: Dec 2006
Posts: 52
Default Re: A/C Fan won't turn off...ever

Quote:
Originally Posted by dnk View Post
I had the same problem, but couldn't source the transistor. A 2N3055 from Dick Smith or Jaycar works just as well. You might want to replace the transistor's insulator washer and bushes as well.
DAM, this was the step I missed :(
Bernie351 is offline   Reply With Quote Multi-Quote with this Post
Old 09-07-2013, 08:13 PM   #46
Bernie351
Regular Member
 
Join Date: Dec 2006
Posts: 52
Default Re: A/C Fan won't turn off...ever

FIXED
Thanks bluey and others..
Got the parts from jcar ($8)
the insulators listed didn't fit, too small for the bolts?
I changed the bolts to suit and whacked it back together ..
woohoo...we have a heater again..

These forums are great
Bernie351 is offline   Reply With Quote Multi-Quote with this Post
Old 22-06-2014, 08:52 PM   #47
monaroman
Starter Motor
 
Join Date: Jun 2014
Posts: 2
Default Re: A/C Fan won't turn off...ever

Awesome thread guys, just what the doctor ordered, followed aussieblue's instructions on a AU series 2 fixed the problem in about 2 hours, thankyou to all who have contributed info here, cheers
monaroman is offline   Reply With Quote Multi-Quote with this Post
Old 30-09-2014, 04:22 PM   #48
mwoonkey
Starter Motor
 
Join Date: Oct 2010
Posts: 2
Default Re: A/C Fan won't turn off...ever

Quote:
Originally Posted by aussiblue View Post
The main transistor in the fan speed controller that sits in the a/c air intake duct to keep cool will have corroded and shorted. Leaves and moisture get caught in the duct sit on the transistor casing and rust it away. Replacement transistor can be had from Worldwide Electronics http://members.iinet.net.au/~worcom/ for less than $15. The symptom of the transistor's failure is a fan that stays on high speed or stays on all the time.

The transistor is Motorola 2N5686 (Ford used to own Motorola). The fan speed controller box (silver metallic held by two screws behind glove box) opens easily by bending the tabs and its not too hard to unsolder the transistor and replace it - just ensure the orientation is correct so you don't reverse wire it (very easy to do as it seems to fit better the wrong way around).

To prevent the transistor failing again I suggest you add a TO-3 plastic cover (Cat ZM-0004 at Jaycar, Cat H7290 at Altronics, Dick Smith have them but I can't find it in the catalogue) and /or an additional TO-3 heatsink (part number H3400 at Disk Smith, Cat number H0610 at Altronics, and HH8510 at Jaycar). These will keep the leaves away. You can also spray the transistor's outer case with circuit board lacquer or something similar for added protection.


See also page 6 & 7 of this thread http://www.fordforums.com.au/showth...05&page=6&pp=25
__________________
for the life of me I cant find this dang fan speed controller.
had the glove box out and cant find no silver metallic box to unscrew.

I have an 03 BA falcon.

any help would be much appreciated
mwoonkey is offline   Reply With Quote Multi-Quote with this Post
Old 30-09-2014, 11:01 PM   #49
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

BA onward is different the fan speed controller is integrated into the HIM (HVAC Integrated Module).
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
This user likes this post:
Old 01-10-2014, 02:02 PM   #50
mwoonkey
Starter Motor
 
Join Date: Oct 2010
Posts: 2
Default Re: A/C Fan won't turn off...ever

Damn. Thanks blue
mwoonkey is offline   Reply With Quote Multi-Quote with this Post
Old 10-01-2015, 09:39 PM   #51
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

See http://www.fordforums.com.au/showthr...56#post5302456

We now know there are two different types of fan speed controller; the more common (and more frequently failing ones) with the TO-3 Motorola transistor and seeming less common and less troublesome (no case in the vent to corrode) Bosch Blower Module ones. I suspect they are interchangeable but someone will have to trial test and see.
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 20-04-2015, 10:37 PM   #52
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

Also see http://www.fordforums.com.au/showthread.php?t=11433274 re the other small MJE 3055T transistor that also fails.
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 05-08-2015, 11:17 PM   #53
Ismegordo
Starter Motor
 
Join Date: Jan 2013
Posts: 6
Thumbs up Re: A/C Fan won't turn off...ever

Quote:
Originally Posted by aussiblue View Post
See http://www.fordforums.com.au/showthr...56#post5302456

We now know there are two different types of fan speed controller; the more common (and more frequently failing ones) with the TO-3 Motorola transistor and seeming less common and less troublesome (no case in the vent to corrode) Bosch Blower Module ones. I suspect they are interchangeable but someone will have to trial test and see.
Hey there AussieBlue,
Now I am not sure if I have the right part as the part I have seen is the same Silver box and it still gets screwed to the A/C duct work BUT there is no Transistor to worry about, so if thats the one then I can tell you that they are not interchangeable, YES all the Electrical connectors are the same as our one BUT when connected all I got was the Blower only working on H but it would turn off which was at least nice.
I hope this helps and doesn't confuse anyone
Thanks for All your help though AussieBlue.
Regards
Gordon
Ismegordo is offline   Reply With Quote Multi-Quote with this Post
This user likes this post:
Old 19-12-2015, 06:07 PM   #54
MercurySilver
Isn't it obvious?
Donating Member1
 
MercurySilver's Avatar
 
Join Date: Nov 2009
Location: in a world of idiots
Posts: 5,357
Default Re: A/C Fan won't turn off...ever

Lovely
Just grabbed an ef monty wagon and the clinate just stays on at 19 degrees.....wbich is fine right now as its stinking hot.
Ill g et to jaycar and get these parts before xmas
__________________
08 Strike G6E T.
Sept 75 XB Falcon in mushroom beige, 3 on the tree 200cid disassemble has started
http://www.fordforums.com.au/showthr...=1#post5256466 the slowest build thread in history
95 EF Fairmont Wagooooon daily
MercurySilver is offline   Reply With Quote Multi-Quote with this Post
Old 19-12-2015, 06:35 PM   #55
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

Quote:
Now I am not sure if I have the right part as the part I have seen is the same Silver box and it still gets screwed to the A/C duct work BUT there is no Transistor to worry about, so if thats the one then I can tell you that they are not interchangeable, YES all the Electrical connectors are the same as our one BUT when connected all I got was the Blower only working on H but it would turn off which was at least nice.
Useful to know.
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 28-12-2015, 05:47 PM   #56
MercurySilver
Isn't it obvious?
Donating Member1
 
MercurySilver's Avatar
 
Join Date: Nov 2009
Location: in a world of idiots
Posts: 5,357
Default Re: A/C Fan won't turn off...ever

Aussieblue
Ive removed the silver thing via the 3 screws
Prised the tabs open and taken cover off
Thers no transistor in side
Two small circuit type boards. Its pretty clean
In the photos on the prev page you can see the rusted silver cover because of the angle bracket on the bottom, but i have none of that stuff on top like in the photo...unless its all sitting inside the big black box on the right where the silver box inserts
Damn thats a tight fit
??

95 ef fairmont wags
Any ideas?

Would i need to replace the whole silver box bit??

Was the old stuck on 19 degrees no wipers radio power windows etc trick
__________________
08 Strike G6E T.
Sept 75 XB Falcon in mushroom beige, 3 on the tree 200cid disassemble has started
http://www.fordforums.com.au/showthr...=1#post5256466 the slowest build thread in history
95 EF Fairmont Wagooooon daily
MercurySilver is offline   Reply With Quote Multi-Quote with this Post
Old 28-12-2015, 06:26 PM   #57
aussiblue
FG XR6 Ute & Sedan
Donating Member3
 
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 10,811
Technical Contributor: For members who share their technical expertise. - Issue reason: Has been floating around the oze tech section for a long time and is always there to give advice when people have an issue. 
Default Re: A/C Fan won't turn off...ever

See http://www.fordforums.com.au/showthread.php?t=11433274
__________________
regards Blue
aussiblue is offline   Reply With Quote Multi-Quote with this Post
Old 16-12-2016, 10:11 AM   #58
Lastofthev8s
Starter Motor
 
Join Date: Dec 2016
Posts: 1
Default Re: A/C Fan won't turn off...ever

Thanks to everyone above for helping me solve my problem

My fan was either on high or low, none of the manual settings in between would work

After finding the fan speed control box I removed then replaced only for the fan to work at all times on high even with no key inserted

Found this thread and went to Jaycar. I bought 2 transistors and a pack of insulators for $9

I found it best to unsolder all 3 wires including earth to the bolt for fitment

Using both the insulator gasket and heat sink paste I bolted the transistor to the housing. Then soldered the 3 wires back to their terminals

I now have the full manual range of fan speeds on my climate control for the first time since buying my car

Ford forums is awesome

Thanks everyone again

Black 92 EBII Fairmont Ghia 5.0 full Tickford optioned
Lastofthev8s is offline   Reply With Quote Multi-Quote with this Post
This user likes this post:
Old 16-07-2017, 10:31 AM   #59
glennrachridd
Starter Motor
 
Join Date: Apr 2017
Posts: 1
Default Re: A/C Fan won't turn off...ever

2000 AU2 Fairmont. hi guys i have a almost a same problem . my fan for my ac/ heater wont turn off and is stuck on high speed but will turn off with the key off . now after reading alot of pages of stuff on the net i found out how to unplug it so its not going all the time and that i there is a controller behind the glove box so i pulled the unit out and took it auto sparky for to have a look at it and test it they sent it to Melbourne to be repaired $528 later thinking that was the problem plug it back in and still the same . not sure what to do now has anyone had this problem and know whats going on ..... thanks Glen
glennrachridd is offline   Reply With Quote Multi-Quote with this Post
Old 23-12-2017, 01:25 PM   #60
pparbo
Starter Motor
 
Join Date: Aug 2013
Posts: 2
Default Re: A/C Fan won't turn off...ever

1991 EB Fairmont.
My problem is similar to glennrachridd.
I put a new Transistor into the Fan Controller - No good, still the same problem.
I replaced the Climate Control Unit (CCU)- still no good!
WTF is going on??
Is it possible that The Fan Controller is 'stuffed' - Not the Transistor??
pparbo is offline   Reply With Quote Multi-Quote with this Post
Reply

Thread Tools
Display Modes

Forum Jump


All times are GMT +11. The time now is 07:02 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Other than what is legally copyrighted by the respective owners, this site is copyright www.fordforums.com.au
Positive SSL