Re: [diesel_mercedes] Re: Heater box?

 

OK, I'm not so well-versed on the W201 chassis, BUT, hot air out of the defrost vents is the default, "limp-home" mode on the earlier cars (W116, W126, W123).  When the system fails, for any reason, defrost is the one function that is most needed for safety's sake.

My guess is that you have a control/servo problem.  Not nearly the expense or trouble getting into as the heater box/heater core.

I would look at whatever electronic control box this system has, perhaps a heater control valve/servo unit, or even the buttons themselves.  Perhaps what you need could be found here:

http://www.autohausaz.com/search/group.aspx?sid=hs2ivr45npikzu453zd54zz5&makeid=800016@Mercedes&modelid=1192531@190D&year=1986&cid=24@AC%20%26%20Heat%20-%20Climate%20Control

Specifically, the "AC & Heater Control Valve", the "AC Control Unit" or the "AC/Heater Control Switch".

Best of luck, JD.

Mark in Lakewood, CO

From: "JD" <jdblackwell2@gmail.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Thursday, June 30, 2011 4:30:54 PM
Subject: [diesel_mercedes] Re: Heater box?

 

I get hot air out of the defrost and front vents regardless off settings. There's apparently some vacuum issues but when vacuum is applied from an external source the blend doors don't move and they're stuck at full heat. I just got the car recently and there are a few questionable "repairs" to figure out. My mech says he's never seen a heater box go bad but warned that it was sold as a rather pricey entire assembly. We still have a lot of diagnosis to go through but trying to stay ahead of the curve in the event of a worst case scenario.

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