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#1
01-17-2005, 11:56 PM
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No heat above certain speeds on 82 300D
Ok. Here's the deal. On the 1982 300D, the heat works great at low speeds. It gets real warm and toasty inside. But today, I noticed at highway speeds, more specifically, about 70 mph, the air starts cooling through the vents. I had the thermostat control all the way to MAX, but it just blew cool air, but when I kept the speed below 55, it was nice and hot again. Am I dealing with a torn monovalve diaphragm or something else?
-Joe
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. 
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#2
01-18-2005, 12:16 AM
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Never had it happen, but sounds like monovalve.. There was a fellow just a week or so ago with the exact same deal I believe..
__________________
One more Radar Lover gone... 1982 VW Caddy diesel 406K 1.9L AAZ 1994 E320 195K
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#3
01-18-2005, 01:23 AM
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MonoValve is bad.
Replace it and the problem should be gone.
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#4
01-18-2005, 01:36 AM
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Does anyone have part numbers or prices for a monovalve?
-Joe
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123.
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#6
01-18-2005, 01:46 AM
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FastLane has it
1982 Mercedes Benz 300D Turbo
Part: Mono Valve Repair Kit R3023-15174 Mono Valve Repair Kit Bosch IN STOCK $41.14 http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1FE046QDU1FH03PI4E&year=1982&make=MB&model=300-DT-001&category=R&part=Mono+Valve+Repair+Kit
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