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Old 12-30-2002, 02:29 PM
Posts: n/a
Question ACC mono valve '90 300e

Engine coolant temperature climbs to 120_C, heater blowing cold air. seems as if coolant finally starts to flow across heater core because heater will start blowing hot and engine coolant temp gauge to ~100_C. Temperature up and down from ~100-120_C. Suspect ACC mono valve. Would like to hear how hard a job to replace on my 1990 300E.
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Old 12-30-2002, 05:24 PM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
If it is the same as my 86...

buy the repair kit. Remove a few of screws and replace. It is next to the battery on my car. Parts shop or Fast Lane should have it.
'86 300E
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Old 01-01-2003, 06:34 PM
Senior Member
Join Date: Sep 2002
Location: New Jersey, U.S.A.
Posts: 2,398
Replace the thermostat.
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Old 01-02-2003, 02:19 AM
pmizell's Avatar
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Join Date: Jun 2001
Location: Houston, Texas
Posts: 838

The mono valve repair kit J.H. mentions isn't available for the '90 M103 engine, you'd have to replace the whole valve. I think it's a pretty straightforward job to replace because it's very accessible ... although I'm pretty sure you'd have to drain your coolant system.
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
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Old 01-02-2003, 10:01 PM
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Join Date: Sep 2002
Location: New Jersey, U.S.A.
Posts: 2,398
The coolant temp rises to 120C! Forget the mono-valve!
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