[W126 Coupe] who has the HVAC diagnosis scans handy?

[Dick Spellman]

That's the defrost flap vacuum actuator you are describing.  Consider
renewing all if you are diving in there.  George Murphy at Performance
Analysis has the kits requiring you separate the vac pods and replace the
rubber diaphragms.  I've done this many times, they work great.  Kit is $50
or so for all the actuators.  Or, go to MB and buy new ones, $70+ each as I
recall.

You should test all the actuators, including the air make up door (dual
actuators) using a MightyVac.  Just plug right into the feeds on the HVAC
switching manifold to the right side of the radio/HVAC assembly.  Then
you'll be able to see what else is needed.

Blower motor is 30 minutes while upside down in the passenger footwell.  I'd
throw a temp 12vdc to the leads once unpluged from the car harness, to
confirm the blower is bad.  They go at 180 to 220k miles on the 3 I've
done.  Some water can get in there from the air damn above and the brushes
don't last forever.

Regards,
Dick

On Tue, Aug 12, 2008 at 6:04 PM, Richard Shayegan <rrshayegan at wm.edu> wrote:


> I don't have my service manuals handy. Anyone have the scans of the HVAC

> diagnosis handy? Or, if anybody is a real wiz with this, which vacuum is bad

> when the open triangle A/C doesn't put air out the center vents and does put

> a lot of air out the defroster vents (same goes for the EC button) and the

> filled-in triangle A/C makes air come out the center vents and a very slight

> amount of air come out of the defroster vents?

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