A/C Blower transistor, '88 m6 were is it located?

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JCS
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A/C Blower transistor, '88 m6 were is it located?

Post by JCS »

Hi Fellow Forum Members,

I have read up on this and no one tells exactly were the in dash A/C blower transistor is located.
Is there a tutorial for this that I have missed?

I replaced the transistor in the heater blower and it works great on variable, as it should.
Realoem does not show a transistor for the '88 m6, # 15 and # 8 are not shown. My A/C switch works only on high.
link,
http://www.realoem.com/bmw/enUS/showpar ... Id=64_0484

I saw the tutorial for the fan speed control switch, replacing the small transistor inside the switch for part # 61311381317 (#BD543A)
See Chris Wrights post, link, viewtopic.php?t=2465

Best,
Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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JCS
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by JCS »

Fellow Forum Members,

I got a reply jps635, on the subject.
Here is a copy. Quote,

jps635 wrote:
Just removed mine for good.

The transistor is attached to the rear of the 6/8 pronged electrical plug on the RH side, just above where the A/C pipes enter. ('85 635 RHD).You'll have to remove the A/C box to access, but its not that hard.

Assuming your A/C pipes are on the same side, you won't have the pedals in the way. Just need to peel back / break off that white factory lagging and undo 2 unions. Have a rag handy to catch the oily crap that drops out.

Note, part of the a/c ducting sits on top of the A/C box and may not be obvious if it remains in place (2 spring clips up high). You'll need to make sure this goes back in the right place when reinstalling.


Dear jps635,

Thank you for your kindly information!
Yes, my worst fears are now justified, I think I will need to delay this job until after summer.
Because my sixer is my only car at the moment, but I work from home.

Best,
Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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Stoffie
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by Stoffie »

If your car is LHD, you can get to it fairly easily by removing the glove box. I did mine a lot of years ago, but can't seem to find the step by step online guide I used.
The M88/3 was all about power, no cats. At idle the raw fuel from the exhaust will make your eyes water like an old V-8 powered muscle car's exhaust did.
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JCS
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by JCS »

Stoffie wrote:If your car is LHD, you can get to it fairly easily by removing the glove box. I did mine a lot of years ago, but can't seem to find the step by step online guide I used.
Stoffie,

Nice to hear from you!
Thanks for the info.
I have attached a photo of the transistor, just wanted to make sure that this is the one for the A/C blower.
Do you remember if it is attached to the black clamshell case? On the right side, as you said near your pedal box, right hand drive.
Or is it mounted above the left hand drive glove box some were?
Realoem does not show a picture of it, in the A/C drawing, only on the heater blower and the add on A/C unit.
Part # 64111381784
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Best,
Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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Stoffie
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by Stoffie »

I think the part(number) you are referring to is related to the heater blower motor. Seems to have the heatsink attached to it. Don't think it will fit into the AC transistor assembly as is.

Although it seems they actually use the same transistor which apparently can be replaced by a more recent and heavy duty one (check this thread: https://www.bimmerforums.com/forum/show ... C-Resistor), I think you need the transistor itself without heatsink.

I got the transistor, not the whole assembly (as it shows in the attached pics) along time ago. It's a bit of a mess as you then have to clean up the protective coating the pcb is coated in, unsolder the transistor, solder the new one,coat the transistor and coat again in waterproof stuff (as it's prone to condensation where it sits).

If you have a bit of a flexible neck and back (or a kid that has good dexterity, hehe), you can see and get to it after removing the glove box. I'm 6'2 and I managed.
I don't remember how it was attached to the condenser assembly but might have had to break some plastic holding pins or something. I seem to remember having screwed it back on or something of the like. Just too long ago :shock:
Attachments
ac transistor1.jpg
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ac transistor.jpg
ac transistor.jpg (145.61 KiB) Viewed 10493 times
The M88/3 was all about power, no cats. At idle the raw fuel from the exhaust will make your eyes water like an old V-8 powered muscle car's exhaust did.
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JCS
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by JCS »

Stoffie wrote:I think the part(number) you are referring to is related to the heater blower motor. Seems to have the heatsink attached to it. Don't think it will fit into the AC transistor assembly as is.

Although it seems they actually use the same transistor which apparently can be replaced by a more recent and heavy duty one (check this thread: https://www.bimmerforums.com/forum/show ... C-Resistor), I think you need the transistor itself without heatsink.

I got the transistor, not the whole assembly (as it shows in the attached pics) along time ago. It's a bit of a mess as you then have to clean up the protective coating the pcb is coated in, unsolder the transistor, solder the new one,coat the transistor and coat again in waterproof stuff (as it's prone to condensation where it sits).

If you have a bit of a flexible neck and back (or a kid that has good dexterity, hehe), you can see and get to it after removing the glove box. I'm 6'2 and I managed.
I don't remember how it was attached to the condenser assembly but might have had to break some plastic holding pins or something. I seem to remember having screwed it back on or something of the like. Just too long ago :shock:
Stoffie,

Thanks again for the info!
Okay I found it, according to your 2nd photo (credit to Gunz635 on BF), it is hidden behind wiring on the right side of the black clam shell case.
It is just above the white insulated copper A/C piping from the A/C Compressor.
I have taken a photo of it installed, it has 2 plastic rivets holding it as it is recessed into the case, it looks like its welded in.
The photo of it removed, looks like the plastic rivets side has been cut off, probably with a Dremel, in order to remove.

I will keep the post updated, as I may give it a go!
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Best,
Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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JCS
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by JCS »

Forum Members.

Okay, I removed the part, it is # 64111381785,
link, http://www.realoem.com/bmw/enUS/showpar ... 4111381785
#15

Best,
Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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JCS
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by JCS »

Forum Members,

To remove the transistor there are two expanding rivets # 51161881149
link, http://www.realoem.com/bmw/enUS/showpar ... 1161881149
NOTE : BMW shows a photo of this part, on Realoem, showing the full expanding rivet with the center part.

Just use a sharp thin tool (drill bit) to push out the center, of the rivets.
Then pry out the recessed part, BEND the sliver thing at the top right of the photo, to the right, out of the way.
You may need to scrape away some of the white sticky insulation away from the top side of the copper refrigeration lines.
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Best,
Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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JCS
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by JCS »

Forum Members,

Okay, I did some research, on the tiny transistor, to purchase it without the heat sink.
Radio Shack does not have the exact same part #.
But Surplus Electronic Sales does have a substitute, according to the post on BimmerForum post by Taylor Marshall (post #8) said that a beefier part is available with 30 amp capacity. # 2N5302 Mexico 8824
https://www.bimmerforums.com/forum/show ... C-Resistor
If you want to solder it yourself, then use SES.
https://www.surplus-electronics-sales.c ... &x=13&y=12
Its $1.75 + $3.56 mail = $5.31
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Best
Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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raykoke
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by raykoke »

Cool!

Cheers,

Ray
'85 ///M635
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JCS
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Re: A/C Blower transistor, '88 m6 were is it located?

Post by JCS »

raykoke wrote:Cool!

Cheers,

Ray
Thanks Ray,

To un-solder the transistor you have to drill out the rivets holding the part together.
It does not look easy to me.
Here are some more photos.
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Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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JCS
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Re: A/C Blower transistor, '88 m6 were is it located? UPDATE

Post by JCS »

Forum members,

Okay, update on the install of the new A/C transistor.

I had some trouble installing the expanding rivets, they require a lot of force to push in the center pin.
I tried pounding with a mallet, no luck, not much room either.

I tapered the one end (see photo) and applied some lube, and success.

After I hooked up the two electric leads, I bent the silver thing back to its old location.

My under dash electrical is a mess, because of a the previous owner had a new stereo installer, he did quite a hatchet job.

New Transistor and rivets
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Rivets tapered
P7110009.JPG
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Electric attached two plugs
P7120011.JPG
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Bend back silver thing.
P7120012.JPG
P7120012.JPG (292.86 KiB) Viewed 10415 times
Best,
Jay
'88 M6, Red/Tan
My NEW Website https://www.jaysbmwparts.com/
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