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Posts: 895
Location: Maryland (USA)
Registered:
June 2003
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Posts: 12490
Location: Washington
Registered:
February 2003
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Mon, 04 December 2006 21:39
 
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nice writeup man!
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Posts: 4083
Location: The Bronx
Registered:
May 2005
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Mon, 04 December 2006 21:51
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Nice write mate.Would you tell where to get the transistor?Maybe even the model # so whoever get into this situation will get ahead sooner.
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Posts: 895
Location: Maryland (USA)
Registered:
June 2003
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Tue, 05 December 2006 18:53
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The Volvo part number for the transistor is 30864189-3. Next time I change the cabin filter (soon) I'll get the transistor component number so that some ambitious person can maybe swap the transistor itself out and save some $. Probably cost about $5 to $10.
Stan
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Posts: 323
Location: Seaside CA
Registered:
January 2007
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Fri, 23 March 2007 11:50
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how do you take out the two screws? i cant reach the top one
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Posts: 8
Location: Cambridge, UK
Registered:
May 2007
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Wed, 09 May 2007 08:13
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sks40: thanks for the useful post - just wish I'd found it before I pulled the central fan control unit out and spent an hour or so trying to work out how it worked and what was wrong with it...turns out the problem was much simpler!
The transistors are MJ802 and 2SD525 but the latter is now obsolete. There are plenty of suitable replacements (I used MJE15028G but others will do fine). Getting the heatsink unit apart was a bit of a one-way operation  so I had to use glue to put it back together. All done, tested and working - just waiting for the glue to dry before I bolt it all back into the car.
miscarmi00: you need to remove the glovebox then remove the bolts which attach the metal strut which runs along the base of where the glovebox attaches to the rest of the dash. One of these is under a little plastic tab on the door-side and the other is behind the section of carpet which covers the passenger-side of the centre console. The strut should now be loose enough to allow a screwdriver in there (you don't need to remove it completely)
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Posts: 7503
Location: St.Louis, MO
Registered:
February 2003
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Thu, 08 November 2007 10:03
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those instruction dont make sense. why would you have to remove the entire blower motor to get to the transistor when it looks like you can just unscrew the two screws and pull it out. my question is, how do i get to the top screw. its impossible
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Posts: 8
Location: Cambridge, UK
Registered:
May 2007
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Thu, 08 November 2007 10:13
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| BrianT wrote on Thu, 08 November 2007 18:03 |
those instruction dont make sense. why would you have to remove the entire blower motor to get to the transistor when it looks like you can just unscrew the two screws and pull it out.
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You don't have to remove the blower motor - he just put those pics up there to show you which bit you need to get to (ringed in the photos).
| BrianT wrote on Thu, 08 November 2007 18:03 |
my question is, how do i get to the top screw. its impossible
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See my reply to miscarmi00, above.
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Posts: 7503
Location: St.Louis, MO
Registered:
February 2003
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Posts: 7503
Location: St.Louis, MO
Registered:
February 2003
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Thu, 08 November 2007 13:22
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alright, after pulling extremely hard and completely undoing the hex bolts on the sides, i managed to get the screw out and replaced the transistor.
THANKS!
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Posts: 7503
Location: St.Louis, MO
Registered:
February 2003
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Thu, 08 November 2007 14:21
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so after all that...i am still having problems. Primarily in the number 1 position. It blows soft then super hard, then not at all then back to soft, then hard, etc...
any other thoughts?
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Posts: 12490
Location: Washington
Registered:
February 2003
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Mon, 18 February 2008 15:55
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| BrianT wrote on Thu, 08 November 2007 16:21 |
so after all that...i am still having problems. Primarily in the number 1 position. It blows soft then super hard, then not at all then back to soft, then hard, etc...
any other thoughts?
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sounds like your problem is the actual fan speed potentiometer solder joints. See the other how to on "possessed ac control"!!
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Posts: 74
Location: Saint Paul, MN
Registered:
April 2007
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Tue, 01 July 2008 07:50
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Anyone happen to come across a new transistor for the HVAC that they wouldnt mind selling. A dealership quoted me at some $105 for the part number listed on here.
I thought I read somewhere about someone saying $85!!!! Let me know if anyone can help out, as I too hate being blasted with cold air at 8 in the morning! Thanks guys/girls.
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Posts: 895
Location: Maryland (USA)
Registered:
June 2003
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Re: How-To: Fix HVAC Fan That Runs All The Time
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Thu, 03 July 2008 19:56
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There was another thread here on this problem. You can actually change the transistor for a few $ with one from Radio Shack or other electronic part store.
Stan
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