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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

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Old Oct 30, 2008 | 03:37 PM
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Doc Scott
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94 S320
Unhappy HEAT
No heat comming out of the vents. Replaced the blower last year and it is working fine at all speeds. no hot air out of vents and the air that is exiting remains cold, also there is very poor flow even when the defroster is enabled.
Any help/ suggestions/ replies are appreciated.
Thanks,
Cold toes aka Doc Scott
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Old Oct 30, 2008 | 04:25 PM
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C43AMG
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98 Black C43 , 12’ ML 350 Blutec
There is a "bleeder" valve located on the passenger side firewall near the heater core that is probably stuck shut.
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Old Oct 30, 2008 | 07:51 PM
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94 S320
More info needed
Is this inside the cabin or in the engine bay?
I cannot locat either theheater core or a bleed screw or even a hose on that side of the vehicle...
Doc Scott
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Old Oct 31, 2008 | 08:38 AM
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C43AMG
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98 Black C43 , 12’ ML 350 Blutec
Originally Posted by Doc Scott
Is this inside the cabin or in the engine bay?
I cannot locat either theheater core or a bleed screw or even a hose on that side of the vehicle...
Doc Scott
PM sent
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Old Dec 6, 2009 | 11:59 AM
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1995 S 420 w140
Hey C43:

Did you ever solve your no heat problem? Sounded like a bad duo-valve to me. I have a similar one, only no heat one one side. Both heater core sensors are showing similar readings so I don't think it's my duo valve.

Thx,

Wade
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Old Dec 6, 2009 | 12:45 PM
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C43AMG
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98 Black C43 , 12’ ML 350 Blutec
Originally Posted by waderamsey
Hey C43:

Did you ever solve your no heat problem? Sounded like a bad duo-valve to me. I have a similar one, only no heat one one side. Both heater core sensors are showing similar readings so I don't think it's my duo valve.

Thx,

Wade
Doc Scott had the problem.
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