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Old 02-22-2009, 07:13 PM
126 Guy
Join Date: Sep 2005
Location: Queens, NY
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Arrow Heat issed- w126 1991560sel

Having heater issues with my 91 560SEL. The heat takes very long to get really hot when the car is at operating temperature but most of the time just cool to luke warm air blows through the vents. I had recently changed the coolant been probably 2 years already with the xerex yellow. I am leaning either towards the monovalve or aux waterpump? Any suggestions would be great.

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Old 02-23-2009, 07:42 AM
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Peach Parts W124.128 User Group.

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Old 02-23-2009, 03:08 PM
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Been There

From experience I also think it's the monovalve, split rubber diaphram, new insert is about $45 here at Fastlane, call Phil.

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Old 02-23-2009, 03:44 PM
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I think it is the monovalve as well. You can removed it and check to see if the diaphram is torn. Just make sure the engine is cool when you do it.
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Old 02-26-2009, 04:18 PM
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Had the same problem with my 420 SEL and it was the monovalve.

"It's normal for these things to empty your wallet and break your heart in the process."
2003 S430- "Yolanda"
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