Ironically enough, my 84 300 SD is having it's climate control guts opened up and serviced this week, possibly for the exact same "locked up" behavior. The louvers/flaps that are part of the system that mixes hot and cold air are vacuum servo driven and were definitely contributing to my vacuum leakage problems. First and foremost, this time tomorrow, for the first time in this car since I rehabilitated her 18 months ago, I should have full/new vacuum on the brake booster circuit and no fade to hard pedal in heavy traffic or downhill mountain roads (thank goodness!). We'll see how well they get the climate control under control - last time, the local Benz specialist only went partway into the climate control problems (my call at the time) and last winter I had heat on the pax side, but not driver. AC and fresh air vents worked well enough. Most ironic, I finally found the properly experienced Mercedes diesel mechanic I've been looking for over the last 2 years lurking at a BMW specialist.
You don't even want to know the size of the bill for all of above...(+ a steering wheel/horn re-assembly (mine exploded last week) + complete front L/R brakes/pads/rotors) and some rear suspension fiddly bits I overlooked on the re-fit and was advised needed replacement after 200kmi..
-Barton
--- In diesel_mercedes@yahoogroups.com, beeser750@... wrote:
>
> I agree with Tom here. What, exactly, is the climate control system doing/not doing? Too much heat? No heat? No A/C? Intermittent?
>
> "Locked up heater box" is a term and condition I've never heard of nor encountered. (Only been working on cars for 35-years, though....) What does this mean, and how was this diagnosis determined?
>
> Generally, one only needs to access the heater core if it's leaking or has low or no heat output (because it's plugged up for some reason).
>
> Mark in Lakewood, CO
> ----- Original Message -----
> From: audiolaw@...
> To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
> Sent: Wednesday, June 29, 2011 9:23:06 PM
> Subject: Re: [diesel_mercedes] Heater box?
>
>
>
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>
>
> What does "locked up heater box" mean?
>
> Climate control systems can be problematic. But the controls run duct and radiator systems that are pretty much like any car, I think. And the systems in a 190D should be essentially identical to any gasser in the same body class.
>
> "Locked up" has that 'stuck door' kind of imagery, that so often refers to a non-working vacuum control valve, or a stuck hinge. So it may be that instead of looking at a big, expensive "assembly" you might be looking at a fix or replacement of a single part.
>
> This is the kind of stuff that I always learn watching Nate work on vehicles.
>
> Tom
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> In a message dated 6/29/2011 7:01:10 P.M. Pacific Daylight Time, jdblackwell2@... writes:
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> I recently added an '86 190D 5 speed to my fleet and while it looks and runs good, it has some climate control issues apparently due to a locked up heater box. The price for a new one is obscenely high and getting one from a PAP seems unlikely in terms of finding one locally or getting one removed and shipped. Any insights?
>
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