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#1
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I want warm
ok, someone help me with 1985 300sd.
I have had three mercedes benz from 1981 300sd, and 1983 380sl, and this one. I can never get warm from my climate control, it's either to hot or to cold. I'm not sure where to start my diagnosis. Is it the mono-valve, cabin temp sensor, something else, a relay. the climate control unit. i ALSO HAVE BEEN GETTING THIS BURNING PLASTIC SMELL FROM THE HEAT, NOT ALL THE TIME, ALL WHEN I'M TRYING TO GET WARM. p.S. i NOTICED SOME KIND OF WIRING THAT HAS BEN SPLICED INTO THE WIRES ON THE PASSENGER SIDE ENGINE COMPARTMENT, NEAR STRUT HOLE. AND IT TRAVELS TO MY DASHBOARD, I HAVEN'T INVESTIGATED YET. sOME MORON BYPASSED SOMETHING. tHIS MIGHT BE RELATED MIGHT NOT. MAYBE THAT'S WHY I'M SMELLING SOMETHING. |
#2
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Probably not the mono valve since you do get cold try a climate module resolder.
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#3
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what tells controlls the temp of the heater?
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#4
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If the cabin temperature is fluctuating wildly, the cabin temperature sensor is the most likely culprit. It lives behind the small grate in the overhead panel.
If the sensor checks out, the CCU is the culprit..........but less likely if all other functions work. |
#5
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Quote:
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83 SD 84 CD |
#6
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i only smell it when i set it to 22c. not when it's full blast heat. Haven't tried cold. i'm sure my ac is charged, but i just got it and it's cold outside.
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#7
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i did the paper test to the sensor and it holds it, so that works, so the only things that control warm are the sensor and ccu unit?
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#8
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The paper test determines whether airflow is crossing the sensor. It's got nothing to do with whether the sensor resistance levels are proper at specific temperatures.
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#9
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well i get warm, but now i have to figure out what is burning, it's almost smells like a circuit board frying. But i'm not sure, it just strange that it doesn't happen when it's hot.
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#10
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Maybe your blower is going south and pulling too many amps. I just had a bad blower destroy the CCU and the Sensor(I think). The sensor burned up after the blower was taken out. This is on a 126 gasser though.
__________________
1986 Euro 500SEC "RUF" 9:1CR, "Rose" 1985 Euro 500SEC Cabriolet AMG Widebody 1982 Euro 500SEL "Blue" 2001 Texas Heeler (Aussie/Queensland X) "Sulphie", 2012 Queensland Red Heeler "Squeak" Best dogs I've ever had. |
#11
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well, i'm going to open up the ccu to resoldered the joints, i'll look to see if anything melted.
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#12
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Just be aware that re-soldering the CCU will make it worthless as a core, so when you give up and buy a rebuilt one you will have to find an unmolested unit to trade in.
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#13
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I had trouble with temp in my 85
I had trouble regulating the temp in my 85 300DT. I found that the foam tube that runs behind the glove box from the little vent on top of the dash to the temp sensor was gone. I simply connected the hoses that were left behind with a length of hose and now I have temp regulation.
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