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#1
01-27-2014, 09:50 PM
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Climate control Temp sensor
Can anyone tell me where the temp sensor that's in the middle of the dash connects to. I have looked around and don't see where it goes mine has deteriated and have had some weird climate control issues just wanted to get this hooked back up and rule it out. A pic would be great.
82 300D 
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#2
01-27-2014, 11:15 PM
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The 123 300Ds (and 85 and earlier 300SDs) with auto climate control have a little square grill in the dash. Underneath this dash grill is the sensor.
To provide a good sample of the ambient air in the car, a hose connects from the grill to a port on the suction side of the climate control blower. This hose was made of foam rubber in the 123s and it deteriorates over time. If it crumbles, the sensor will not get a good air temperature sample and the regulation will be terrible. In case anyone is reading this with a 124/later 126, the sensor is in the front dome light and there is a rubber hose down the passenger side A pillar to a dedicated aspiration blower behind the glove box.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#3
01-27-2014, 11:35 PM
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silly putting the climate control sensor on the dash.... in the sun..... were it gets hot..... in the sun..... where the sun can shine on it...... and get hot..... in the sun......
way better would be to just relocate it to the intake to the blower, in the air stream if possible...... not in the sun....
__________________
"NEW" 1984 300D TD needs some love
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#4
01-27-2014, 11:44 PM
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Answer
Quote:
300D heater is either off or full blast? here is another thread Automatic Climate Control – Sign of Fatique? The most extreme set of pictures, due to removing the dash for evaporator replacement.. PeachPartsWiki: Replacing the A/C Evaporator .
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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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#5
01-27-2014, 11:45 PM
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Yup that's why the 124s and later have the sensor in the dome light assembly.
__________________
The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#6
01-27-2014, 11:56 PM
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Pick up some 1/2" water pipe insulation from Home Depot....
__________________
 Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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#7
01-28-2014, 12:16 AM
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oh my gosh that R&R on the evap is scary, and i was wondering how hard it would be to get in under all this because it looks like the evap drain hose is dried up and gone on my car.
still wondering if you could replace it all with say a toyota climate control system.....
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"NEW" 1984 300D TD needs some love
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Linear Mode
