\'87 420SEL / \'not much heat\' problem

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'87 420SEL / 'not much heat' problem

05-17-2008, 11:02 PM

Richard / E320 Richard / E320 is offline

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Join Date: May 2008

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'87 420SEL / 'not much heat' problem

I've read some posts regarding a lack of heat (interior heater) and see something called a mono valve or ACC mono valve. My '87 420SEL comes up to operating temperature but there isn't much heat going to the defroster or heater vents. The temperature is luke-warm at best...

Is the mono valve the most likely culprit?

Thank you,

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Richard / E320

2001 E320
1987 420SEL

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