[W126 Coupe] 1985 500 SeC

[jeffrey maniff]

I own a 1985 500 SEC (Euro Version) and I notice that my front heat works 
great but while that blows hot air if I reach my right arm behind me to the 
rear vents it is freezing cold all the time.  Can anyone explain this?   I 
just replaced my compressor prior to the winter and changed over my a/c to 
the appropriate RU series  but I can't explain why I blow cold air in the 
back while simultaneously blowing very hot air in the front.    I am at a 
loss.....
Thank you for any help.
Jeff Maniff



>From: "Axel Wulff" <axelwulff at hotmail.com>

>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

>To: mbcoupes at mbcoupes.com

>Subject: Re: [W126 Coupe] 1985 500 SeC

>Date: Sun, 18 Feb 2007 13:59:15 -0500

>

>Rick,

>

>Did you try changing the Monovalve?

>

>It sits above the auxiliary water pump you mentioned you have checked out.

>

>Otherwise, I'd suspect the fan that pulls air in from the compartment may 

>be

>malfunctioning. The inlet for this fan is next to the rearview mirror. Put

>the heater to defrost and with a light piece of foil or paper, try to see 

>if

>there is any suctions there.

>

>If this fan is malfunctioning, the ACC unit will measure the temp of the 

>air

>in the dash and will "think" the car is nice and toasty.

>

>

>

>Regards,

>Axel J. Wulff

>610-731-5453 Cellular

>610-572-4611 Home

>

>

>

>

>

> >From: WRick11499 at aol.com

> >Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

> >To: mbcoupes at mbcoupes.com

> >Subject: [W126 Coupe] 1985  500 SeC

> >Date: Sun, 18 Feb 2007 13:41:24 EST

> >

> >Its cold here in MD. and my heater is acting crazy. Some times works and

> >sometimes not.I bought a rebuilt  climite control unit and it does the

> >same

> >thing.Some times the defroster blows hot and the center vents blows cold

> >and

> >sometimes every thing works alright but most of the time   all  blow

> >cold.The

> >small pump on the firewall seems to be working plus I bought  a 

>newOverload

> >relay.If I disconect  a battery cable and then replace  it, itseems to be

> >O.K. till

> >I turn the key off, so I think it must be  electrical, are there other

> >relays

> >that I should check and where are they  located in the fuse box, has 

>anyone

> >else had a problem like this.Thanks for  any help    Rick

>

>

> >The MB Coupes Website!

> >W126 SEC Mailing List

> >Postings remain property of MB Coupes, L.L.C.

>

>

>The MB Coupes Website!

>W126 SEC Mailing List

>Postings remain property of MB Coupes, L.L.C.


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