Author Topic: No high blower speed  (Read 208 times)

rob280

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  • W116 Enthusiast
  • Location: United States
No high blower speed
« on: 10 May 2019, 10:06 AM »
My 280S has the auto climate control with the ACCII upgrade kit. It works but the blower speed is always slow, even on high it is slow. What should I look for?
1976 280S
300SEL 6.3 (Someday)

Diesel 617

  • Classic
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  • Posts: 203
  • Location: Illinois
Re: No high blower speed
« Reply #1 on: 11 May 2019, 06:36 AM »
Sounds like your blower relay is on its way out. Pull out the glove box and next to where the amplifier would be there is a small sliver box with a plug attached to it. Remove it and buy a 100% Genuine replacement. Do not go with the Bosch or any non Mercedes part it wont work.
1980 300SD Worn out Engine
1979 280SE Euro Spec Import Crank Windows and Cloth Seats, needs head rebuild, and WUR rebuild
1979 300CD


Inventory of w116 Parts
https://www.ebay.com/usr/vintagepartsandstuff/

rob280

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  • Posts: 4
  • W116 Enthusiast
  • Location: United States
Re: No high blower speed
« Reply #2 on: 12 May 2019, 10:45 AM »
Diesel 617,

That relay is working, the fan speed increases when I press DEF. I hear the relay clicking, and DEF will not work without the relay plugged int. The fan speed just seems low on Auto-HI, the fan does slow down when I push Auto-LO.
1976 280S
300SEL 6.3 (Someday)

daantjie

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  • Location: Vancouver, BC, Canada
Re: No high blower speed
« Reply #3 on: 12 May 2019, 10:38 PM »
Could be the blower resistor.  It's in the fresh air intake section. You have to remove the chrome grill to acess it after you remove the wiper arms.
Daniel
1977 450 SEL 6.9 - Astralsilber

Squiggle Dog

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  • Location: Surprise, AZ, USA
Re: No high blower speed
« Reply #4 on: 13 May 2019, 11:24 AM »
Could be the blower resistor.  It's in the fresh air intake section. You have to remove the chrome grill to acess it after you remove the wiper arms.

You can also access it by reaching up into the opening above where the blower motor housing attaches once the housing is removed and you have the screws securing the resistor to the firewall removed.  For installation, though, you'll have to reach back up in there and push it into place so you can carefully attach the screws without pushing it back in. You can decide which method is more convenient for you.
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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Heated Seats, 347,000+

thegreg92

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  • Posts: 32
  • W116 Enthusiast
  • Location: Phoenix AZ
Re: No high blower speed
« Reply #5 on: 16 May 2019, 09:43 PM »
The blower only runs at max speed on the defrost setting, bypassing the resistor pack. The high or low settings will run thru the various stages in the resistor pack.

I’ve had luck wiring up a relay for the blower that bypasses the resistor when using the high and low settings. Def a game changer in the Arizona summers
1982 W123 240D - sold
1979 W116 450SEL
2007 W164 ML350
2011 W212 E350 Bluetec - lease expired
1978 W116 300SD - sold