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#1
01-09-2009, 05:55 PM
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Weak Heat: Monovalve or Something Else?
Blower's fine, engine temp is fine. But heat seems somewhat weak/anemic. Works consistently, but somehow not as hot as it should be.
I know a bad monovalve can account for intermittent heat or no heat. Can it account for slightly weak heat? Other possible causes? Of course, after 17 years and 208K miles, I'm sure I'm due for a monovalve anyway... Thanks!
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
01-09-2009, 06:02 PM
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You're dealing with the 124.128?
Has the cooling system ever had the "Citric Acid Flush" (with De-oiling prior)?
BUT,that sure sounds like the Mono-Valve.When it's working properly,it's constantly opening and closing, rapidly, in response to the CCU commands as a result of the cabin temperature sensor up by the Sunroof control.
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'84 300SD sold 124.128
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#3
01-09-2009, 06:07 PM
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Yes, it's the 124.128. Just replaced the monovalve on the 126.
No, never have done a citrus flush.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
01-09-2009, 09:04 PM
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I had the same problem in the SDL The monovalve was ripped. I replaced it and everything is fine now.
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#5
01-09-2009, 09:55 PM
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I have the same problem in the '98 though, it's a duo-valve but still the same idea. The diaphram is ripped and it's letting water bypass the heater cores. I believe you can buy a mono-valve rebuilding kit. I'm not so lucky...
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
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#6
01-09-2009, 10:32 PM
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What's the opperating temperature supposed to be? I replaced my mono valve and blocked radiator, still cool. Temp now never gets above 190F. I put sensor for the gauge where the hose comes out of block around 4th glow plug. I guess maybe a flush is due, but not right now.
--------------------- 1984 MB 300 SD Turbo
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