98 ML320 Defroster Flap Sought - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 11-23-2015, 03:44 PM Thread Starter
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98 ML320 Defroster Flap Sought

Woking on my buddy's early 98 ML320. No air out the defrost vent. No air out the side vents.
Checked cable at the console...OK.
Checked cable at the defroster arm (Ugh my back is still sore) .. cable attatched and cable & arm move when dial is turned.
Defrost flap must be broken at the shaft. No air out of the vent in any flap arm position.
I can't seem to find the part number on EPC for the defrost flap inside heat/AC box.
Anyone have acess to that part number?
Next step is junk yard but I would rather install new.

Thanks for the help,

Alex
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post #2 of 10 (permalink) Old 11-23-2015, 07:54 PM
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There is no shaft I know of.

Did you get a picture or look for a parts diagram of the HVAC box?
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post #3 of 10 (permalink) Old 11-23-2015, 10:26 PM Thread Starter
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I attempted to find the part(s) in the EPC site.
There are pics of the air controll box but not the defroster flap.
How is the defroster flap (inside the box) attached to the white lever (arm)?
The arm moves correctly, but the flap that controlls the air management for the defroster (and side vents) doesn't change.
Not a good time of year around these parts to not have defroster.

Alex
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post #4 of 10 (permalink) Old 11-24-2015, 03:51 AM
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The flaps are not sold separately; you must purchase the entire heater box which costs $1,638 less tax.

Search Mercedes Auto Parts like 1638301462

You might get a better idea of things if you removed the top half of the Instrument Panel (not difficult) and then you will be able to manually push down on the defroster door.

Then you might be able to attach a hard wire cable through the flap and then up through the nearest defroster vent.

Below is a used heater box for sale on ebay.
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post #5 of 10 (permalink) Old 11-24-2015, 04:54 AM
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These might help :

Video of removal of upper of dash panel (the steering wheel has been removed in the video, but you don't need to remove it) :


and a close up photo of the the top of the heater box in my 2001 ML55 ... showing the defroster flap. Note that I am in Australia so my car is RHD and yours is LHD, so your heater box will be a mirror image of mine.
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Presently in the garage :
- 2005 ML350 Special Edition (purch. 04/'13)
- 2004 ML350 Luxury (purch. 04/'13)
- 2001 ML55 AMG (purch. 12/'13)
- 2005 SLK350 (purch. 09/'15)
- 2004 SLK200 (purch. 03/'15)
- 2000 S320 (purch. 03/'16)
- 1976 280SL D-Jet (purch. 05/'92)

No longer in the garage :
- 2005 SLK350 (sold 02/'16)
- 2002 ML320 (sold 03/'16)
- 2001 ML430 AMG Sports Package (sold 11/'13)
- 2000 ML320 Luxury (sold 6/'13)

Last edited by RJV; 11-24-2015 at 04:56 AM.
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post #6 of 10 (permalink) Old 11-24-2015, 10:10 AM
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I my defrost problem, the white arm broke, common failure. Part # 1638301033. I could not control the air between the defrost or floor vents.

2009 cls550 62000 miles
2005 BMW X5 110,000 miles
2004 ML350 140,000 miles
2002 BMW X5 167000 miles
1998 323ic (sold) 198000 miles
1997 S320 (sold) 135000 miles
1991 190E (sold) 225000 miles
1989 300SE (sold) 155000 miles
1985 300SD (sold) 235000 miles
1984 300D (scrapped) 240000 miles
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post #7 of 10 (permalink) Old 11-24-2015, 10:15 AM Thread Starter
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OK I think I have a better grasp of the situation now.

I've had the dash of my 98 ML320 off (blend door mtr) and it seems that this one will hafta come off as well. Not a big deal... just time consuming and persnickity (good thing Mercedes puts in all those extra screws.. I have a few leftovers from mine in case my buddy's is missing some )

It seems that a repair attempt on the connection between the arm and the flap might be worth the effort. However, that box on ebay is so cheap I just might grab it for spare parts.

Thanks all!

BTW this site is a great resource. I feel like I am an apprentice at VW again.

Alex
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post #8 of 10 (permalink) Old 11-24-2015, 10:18 AM Thread Starter
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I wonder if the arm for a motorized defroster flap will work in an earlier model non-motorized unit...

THAT would be a very nice fix.

I'll order the arm, and post back if that arm fits the earlier unit.

Alex
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post #9 of 10 (permalink) Old 11-24-2015, 11:03 AM
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Quote:
Originally Posted by Halexb View Post
I wonder if the arm for a motorized defroster flap will work in an earlier model non-motorized unit...

THAT would be a very nice fix.

I'll order the arm, and post back if that arm fits the earlier unit.

Alex
You are being led down the wrong path. There is no arm to order on a 1998-2001 ML.
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post #10 of 10 (permalink) Old 11-24-2015, 02:33 PM Thread Starter
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thnx 43sqd.
I guess I'll open it up and see what exactly is going on in there.
If I can't rig something acceptable, re cable it up or just open it and leave it, the eBay option should suffice.

Again, thanks for the help.

Alex
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