S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

Cabin Heat issue 89 560SEL

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Old 11-01-2007, 01:54 PM
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2006 SL500
Unhappy Cabin Heat issue 89 560SEL

Ok here's what I have.
A 1989 560SEL with barely any heat.

Heat barely works with fan set to low, heat on max, and econ setting selected.

If non-econ (a/c unit on) setting is selected then no heat at all. NO heat on any other settings than above. What the heck is wrong??

Thanks!!

p.s. thank God for heated seats!!!!!
Old 11-01-2007, 03:24 PM
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1991 560SEC Teal 1989 420SEL Ice Blue 1984 500SEC White
From waht I was able to gather, it sounds like possibly the monovalve.
Old 11-01-2007, 11:07 PM
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how can i tell if its not function? other than no heat. where is it located?
Old 11-02-2007, 01:06 PM
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1991 560SEC Teal 1989 420SEL Ice Blue 1984 500SEC White
The monovalve is located under the hood in the firewall bulkhead, just left of the battery.(sitting in the drivers seat facing forward)

Do you have heat at idle or at slow speeds, and as you accelerate do you have less or no heat?

If so monovalve....

Let me know
Bruce
Old 11-02-2007, 01:44 PM
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Wink

monovalve it was. all fixed. thanks to all!!!

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