How to access blend door/motor on 00’ r170

659 Views 16 Replies 5 Participants Last post by nkristoff, 27 d ago

nkristoff

Discussion Starter · 2 mo ago

Hello back again with a problem I’ve had since I got this car back in may of 2022, last year I didn’t have A/C and I do not want to not have it again this summer in Texas! I’m trying to access the blend door/motor because while in motion I get hot air from outside coming into the cab from the vents constantly and it is brutal unless the windows are down. Any help is appreciated, I’ve had no luck doing my own research for quite some time now. Thanks in advanced to anyone who knows the answer to my question

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BaD_81

· #4 · 2 mo ago

FG 170.449 - HEATING AND VENTILATION > Mercedes EPC Online > nemigaparts.com

Parts catalogs. Spare parts catalog Mercedes EPC Online. Mercedes. Car. HEATING AND VENTILATION.

nemigaparts.com

/\ /\ /\ Engine bay to cockpit with some pics!
Some more details as it is on the Left Steering vehicle\/ \/ \/

Windshield drains under the cowl

I found it near impossible to find a solution for this issue until recently, but still never found pictures. This should simplify it for people having the same issue. For the last couple months, every time it would rain more than a few drips, or we went to the car wash, the passenger floor...

www.slkworld.com

As a general rule heat coming into the cockpit could be related to them "duovalves" and nothing to do with flaps...but that would be a matter of few checks:
Fan control
Cold/warm control
Recirculation Vs fresh air

All of them are connected and do not need to have busted A/C in order to boil in your own juice...

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BaD_81

· #6 · 2 mo ago

Cleaning is good!
But do they close?
As it sounds to me (I am not near you, can't see what you see...) they do let too much of hot water when you start. Use the search engine for how to confirm if they operate well.
When you say stationary and hight rpms do you have a clue what was the coolant temperature?
As if the coolant was under the thermostat setting until you start - cold air. When you start and that coolant Temperature goes over thermostat so the hot coolant rushes into the cockpit.

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BaD_81

· #8 · 2 mo ago (Edited)

A/C being on-off doesn't apply to duovalves they are separate systems.
A/C click is in front of the driver for you, where the A/C compressor, filter drier, liquid receiver are located. Operating hot-cold on the temperature scale for vents will do them duo valves off.
Take a read of the forum for duo valves.