[W126 Coupe] No Heat / Air Movement on Driver Side Footwell

[Dick Spellman]

Elm:

Just to clarify, there are 5 vacuum actuators and all should be 
checked.  It's very common to  have the rubber diaphragms fail.  You can 
rebuild actuators using George Murphy's kits. (approx $50-60 US).  You 
can run the MB manual ACC output test and/or take a MightyVac and 
disconnect one line at at time from the vacuum switching valve and test 
by viewing each actuator as you apply vacuum (passenger console side 
carpet/knee bolster removed to get at the switching valve).  Two vac 
lines are looped to manage the two actuators on the fresh air/recirc 
door.  This is easily accessed and viewed on your 86 by removing the 
glove box insert.

Regards,
Dick

Elm Zobens wrote:

> All,

> I have finally got my 86' SEC roadworthy again and I am just knocking 

> out some lingering bugs.

> Since I've owned the car, I cannot get any air movement on the driver 

> side footwell. It's not a big deal in the summer but now that it's 

> getting cold, my feet are FREEZING! The passenger side is fine and toasty.

> I've blown out the heater core (no junk or flow issues), replaced the 

> monovalve and verified that the circulation pump is working.

> The Benz documentation is somewhat vague and I can't determine if 

> there is more than one flap that controls the floor airflow? Since 

> there is only one vacuum actuator, I am assuming it's the same flap 

> controlling both sides?

> This is driving me nuts!

> How can I have perfect heat and flow on the passenger side and nothing 

> on the drivers? Everything else on the climate control and blower 

> works as it should. All other vents and outlets work perfectly on both 

> sides- It's just the driver side floor that has me stumped.

> Any tips or advice would be GREATLY appreciated!

> Thank you,

>

> Elm

> 1986 560 SEC

> 2006 S500 4matic

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