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#1
12-12-2007, 09:20 PM
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300SD Heater Issue
It has been getting cold here sporadically, and I have noticed some issues with my heater not blowing warm air and had a couple of questions.
When it is cold, 30-40 for around here, the car will only warm up to about 40C. I dont think it is a thermostat problem though, because if it is in the upper 50's, it will warm up to 80C. Does this mean it is a monovalve issue, or could it be the thermostat? thanks guys
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--------------------------------------------------- 1985 300SD 216,000 miles 
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#2
12-12-2007, 09:33 PM
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I'd say thermostat issue.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#3
12-12-2007, 09:38 PM
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Quote:
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83 SD 84 CD
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#4
12-12-2007, 09:48 PM
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Would it be the thermostat even though it gets up to normal operating temp when it isnt cold outside? I guess it could not hurt to replace, do these vehicles take a standard 180 thermostat, or is it a Mercedes only item?
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--------------------------------------------------- 1985 300SD 216,000 miles
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#5
12-12-2007, 11:00 PM
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They come in 175 deg, 185 deg, 195 deg....and are readily available....autozone, advance, oreillys all have them. When it's 30s and windy (i remember mempho being quite windy), engine heat dissipates quickly..I'd bet stuck open stat as others indicated.
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1983 300SD 307k miles 1993 Ford Escort Wagon 215k miles 1995 Isuzu P'up 214k miles
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#6
12-12-2007, 11:14 PM
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I would buy the OEM thermostat and avoid the McParts stuff.
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#7
12-12-2007, 11:15 PM
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the monovalve would only affect cabin temp, not engine temp.
when it's warm out, no thermostat would result in a steady 80C temp, but it would take a LOOONG time to get there, when it's cold out, it takes a REALLLLLLLLLLLLLY long time to reach operating temp. best to get a good 175F (80C) stat in there. keep an eye on the temp from there, if it starts to get hot, you may have water pump issues, or a clogged up radiator.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
12-12-2007, 11:18 PM
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My '82 300D would not get over 60c, forget the time of year. Here's the t'stat I put in. The car died of other causes later, pulled it back out.
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83 SD 84 CD
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#9
12-13-2007, 04:16 PM
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Thanks guys. The advice looks great, as is always the case with this board. Sounds like a quick job for Saturday.
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--------------------------------------------------- 1985 300SD 216,000 miles
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