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#1
03-22-2005, 02:54 PM
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Is This for the ACC Thermostat?
I pulled out the glove box & the thermostat to see if I could figure out why my heat cycles are too long, it's really hot for a while then blows pretty cold for a while. I would have thought it would cycle much faster so there wasn't much of an extreme either way. I was thinking the thermostat was dirty or something, but I found this part laying in there. Looks like the hose had been cut. It also looks like the thermosatat column thingie fits inside & a fan blows cabin air over the thermostat. Am I right? Do I need to fix it?
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Michael Roth 1982 300TDT Wagon 1982 240D Euro!, 4spd manual-Parts car now, dead engine 88 Jeep Grand Wagoneer-fixing up for offroading 1989 Ford F150 (rust bucket) For Sale! 1953 Dodge B-4F, 1 1/2 ton Stake Bed (new restoration project) 
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#2
03-22-2005, 02:58 PM
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Look up
The hose that used to be there can be replaced with some pipe insulation foam hose and your cycling will be much more precise.
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The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later) Last edited by jbaj007; 03-22-2005 at 07:16 PM.
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#3
03-22-2005, 03:34 PM
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Quote:
  !
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'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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#4
03-22-2005, 04:03 PM
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Yep, that was it. Thanks!!!
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Michael Roth 1982 300TDT Wagon 1982 240D Euro!, 4spd manual-Parts car now, dead engine 88 Jeep Grand Wagoneer-fixing up for offroading 1989 Ford F150 (rust bucket) For Sale! 1953 Dodge B-4F, 1 1/2 ton Stake Bed (new restoration project)
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#5
03-22-2005, 05:53 PM
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don't forget the monovalve
you may also want to check the condition of the ACC monovalve diaphragm. My 83 300D cycled like that and it was mainly due to the monovalve. that being said... the cabin temperature sensor tube was disintegrated too but the main reason was the monovalve.
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1983 M-B 300D, 148K, daughter's ride 1983 M-B 300TD, 120K, my ride 1985 M-B 300SD, 102K, wife's ride 1969 HD FLH, 45K, restored/hobby 1996 Chev Suburban, family taxi/tow vehicle 1990 John Deere Model 240 1942 John Deere Model LA 1985 16' 4Winns ski boat
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#6
03-22-2005, 06:46 PM
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Yep, the monovalve was shot too. I replaced that a couple of weeks ago & it was actually working after that! Other than the cycling problem. Thanks though!
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Michael Roth 1982 300TDT Wagon 1982 240D Euro!, 4spd manual-Parts car now, dead engine 88 Jeep Grand Wagoneer-fixing up for offroading 1989 Ford F150 (rust bucket) For Sale! 1953 Dodge B-4F, 1 1/2 ton Stake Bed (new restoration project)
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#7
03-22-2005, 07:54 PM
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I replaced that stupid foam hose in my SL with a piece of unused heater hose (3/4" inch I think) and it works great and will never disintegrate like the OEM part did!
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz 
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