blower motor intake

1971-1989: 280SL, 280SLC, 300SL, 350SL, 350SLC, 380SL, 380SLC, 420SL, 450SL, 450SLC, 450SLC 5.0, 500SL, 500SLC, 560SL
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mercage 80
Dernburg Wagon
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Joined: Mon 14 Mar, 2016 8:03 am
Model you own: w107

blower motor intake

Post by mercage 80 » Wed 15 Mar, 2017 6:26 pm

can someone please tell me where the blower motor gets its air intake from? is it the vents at the bottom of the windscreen? if it is mine are sealed over?? when i turn the fan on all i get is extremely hot air in my face. the heater valves have been cable tied shut so I am at a loss to where to A) get fresh air from or b) seal the hot air off. Please help it is unbearable in Queensland

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TheMadRacoon
C 111
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Joined: Sun 25 Nov, 2012 11:34 am
Model you own: w107
Location: Melbourne

Re: blower motor intake

Post by TheMadRacoon » Wed 15 Mar, 2017 8:24 pm

I'm sure you'd have to unblock those vents....but the question is why were they blocked off in the first place? Perhaps there's corrosion in the bulkhead so that when it rained water would seep into the cabin?

If corrosion has left large holes in the casing around the fan then you'd get hot air from the engine bay feeding your blower.

There's also a flap on each side of an air intake that controls the degree of fresh air / recirculating air, so if that's stuck in the wrong position (leaves, dirt) then that will exacerbate the problem. There's a schematic which I can't post now because I'm using my phone, but google "Mercedes 107 ventilation diagram".

Have a look also at this video, as it will shed some light on where various openings are around the bulkhead / blower:

https://m.youtube.com/watch?v=oeMsD0nsdhY
Emad,
TheMadRacoon
1975 350SLC Astral Silver (725) / Blue (2012, 284,900 km - present.... a real Benz, getting better and better)
1988 190E Deep Blue (900) / Cream (2006, 190,000 km - 2007, ~ 215,000 km .... FSH and still spent big $$$)
1974 280E Reed Green (860) / Bone (1993, 316,700 km - 2004, ~490,000 km and still A1)

mercage 80
Dernburg Wagon
Posts: 8
Joined: Mon 14 Mar, 2016 8:03 am
Model you own: w107

Re: blower motor intake

Post by mercage 80 » Thu 16 Mar, 2017 8:12 am

thank you. Yes there is an issue with corrosion in that area. or was. both slots under the windscreen have been glassed over and the vents outside have been blocked over with what looks like marine ply. So i am only getting air from the blower box and engine bay I think. I have replaced all the evaporator and had the ac redone but it is useless without clean air. I think I will have to mount a slimline under dash system under the glovebox and write the original system off. its way too hot to enjoy the car without it

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TheMadRacoon
C 111
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Joined: Sun 25 Nov, 2012 11:34 am
Model you own: w107
Location: Melbourne

Re: blower motor intake

Post by TheMadRacoon » Thu 16 Mar, 2017 2:43 pm

Wouldn't it be cheaper to free up the air intakes? Or to use some flexible ducting to route fresh air to the two sides of the blower housing to get fresh air to it?

Even if you write-off the existing system you'll be getting warm air into the cabin unless you close off all the vents - but then you should try to get a % of fresh air into the cabin so you don't go drowsy.
Emad,
TheMadRacoon
1975 350SLC Astral Silver (725) / Blue (2012, 284,900 km - present.... a real Benz, getting better and better)
1988 190E Deep Blue (900) / Cream (2006, 190,000 km - 2007, ~ 215,000 km .... FSH and still spent big $$$)
1974 280E Reed Green (860) / Bone (1993, 316,700 km - 2004, ~490,000 km and still A1)

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Chai
OZBENZ moderator
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Joined: Fri 04 Nov, 2005 11:49 am
Model you own: w107
Location: Melbourne

Re: blower motor intake

Post by Chai » Thu 23 Mar, 2017 8:47 pm

Hope this picture helps -follow the arrows for the air flow from the intake in front of the windscreen.
The fan motor has been removed in this picture.
20160207-163950 450SLC ventilation fan.jpg
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Chai
1974 450SLC

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