W108/w109 heater fan replacement - I'm stuck! - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 03-23-2016, 03:24 PM Thread Starter
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Date registered: Apr 2012
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W108/w109 heater fan replacement - I'm stuck!

hi, I'm part way through dismantling the dash of my 72 300SEL in order to replace the dead heater fan. I have the radio, cigar lighter, glovebox, heater control assembly, AC controls and AC fan removed. However, I'm stuck trying to remove the AC air duct that runs from the evaporator to the dash vents. I see clips when I look into the lower access hole and was able to remove 2 of them, but it's still not free.

Do I need to remove the lower dash padding in order to get at this correctly? If so, I don't see how to do this easily as it's pop-riveted to the metal. I don't see any further screws to remove. I removed the ones to the left of the steering wheel and that piece will come apart, but on the right side of the wheel, I am stumped at how to do this.

I've read Britton McIntyre's writeup on another forum, but either it doesn't addess what I'm up against, or I'm not seeing what I should. From the rest of the writeup it looks do-able to me, but I'm stuck at this point.

Thanks, Jim
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post #2 of 8 (permalink) Old 03-23-2016, 06:29 PM
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Do you have the service manual "Passenger Cars Starting 1968 Series 108 109 111 113 Maintenance, Tuning, Unit Replacement"? It shows you how. This is a major pain in the ass job as you know. You should not have to do any drillng to remove rivets etc. More screws, clips in the way they just don't show you. As I recall the lower AC/padding unit comes off as one piece.
Will
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post #3 of 8 (permalink) Old 03-23-2016, 06:30 PM
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Hi Jim
I did this job last year. Not the AC motor, but I removed all the wood for finishing. From my memory there are 4 maybe 5 screw holding the lower padded dash unit in place. There are 2 under that access hole which you already found. Also the ones you found to the left of the steering wheel. I'm sure there is at least one all the way at the other end of the lower dash unit. screwed into the side bulkhead. I will take a look at mine to see if I can jog my memory. Bear in mind when you have all the screws out the dash won't just drop. It will need a bit of wiggling back and forth, mine had a kind of adhesive that attached it to the chrome trim. be especially careful at the area that goes over the steering column. Those are very thin areas and prone to cracking. Mine cracked ever so slightly. I just took this picture to give you an idea of the passenger side screw that goes into the bulkhead. Let me know if this angle makes sense to you.
Good luck John.
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post #4 of 8 (permalink) Old 03-23-2016, 06:34 PM
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Here is one with the ac unit out. Also the area you should be careful of when removing the unit. Let me know if you need any other pictures. I try to take lots of pictures for reference later.
All the best John.
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post #5 of 8 (permalink) Old 03-26-2016, 12:20 PM Thread Starter
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Thanks Will and John. I did find the screw near the right wheel well. When that end didn't pull away easily, I scratched my head and was done for the day.

So, I have the two screws to the left of the wheel, the one at the far right by the wheel well, and one vaguely under and to the right of the ignition switch. So maybe there's one more??

I don't have the manual that you refer to Will, is it generally available?
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post #6 of 8 (permalink) Old 03-26-2016, 06:55 PM
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The paper manual is available on line Ebay but the cost for these is are all over the board.
Will
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post #7 of 8 (permalink) Old 03-26-2016, 07:53 PM
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There is an access panel in the center underneath. if I remember correctly, behind that there is 1 or 2 more screws. Will is correct the padding and ac unit comes off in one. No drilling of rivets etc. is necessary. Remember there is an adhesive between the unit and chrome trim piece.
Cheers John.
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post #8 of 8 (permalink) Old 05-15-2016, 06:53 AM
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Had issues with my w109, so thanks for the advice
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