S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Heat problem

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Old Sep 30, 2009 | 01:03 AM
  #1  
ayayikes's Avatar
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S 500
Heat problem

Cold air blow for back passengers when heat is turn on. We have heat in the front but not in the back. What could be the problem?
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Old Sep 30, 2009 | 08:10 AM
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syljua's Avatar
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From: Oslo, Norway
1998 C140 CL500
No problem, it is supposed to be like that;

From page 27 in owners manual;
http://bayhas.com:8080/w140manu/1997...s%20Manual.pdf

Rear Passenger Compartment Adjustable Air Outlet
Vehicles without rear passenger compartment climate control.
Slide switch (1) up to open outlet for fresh/cooled air only.
br,
syljua
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Old Sep 30, 2009 | 01:51 PM
  #3  
TMAllison's Avatar
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From: Bay Area, CA
09' E320
Give the Duo Valve a solid whack or two with a screw driver handle.
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