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#1
08-04-2003, 11:07 PM
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Another AC Question
I searched the archives and although I found mention of this topic, I don't believe I found the solution to the problem. My AC works like a champ...it rivals a meat locker in the cabin at times. Some may be asking themselves, what's the problem with this? Well, I have no temperature control. It is either freezing or burning hot. The AC works fine and blows cold when the temp wheel is set to MIN. If you raise the temp off of MIN, really hot air starts to blow out of the vents. For a quick trip to the store, this isn't a problem, but when making a long road trip, temperatur control would be nice. I tried swaping my known good temp wheel out of my other car and the problem still exists. Any help on this one would be greatly appreciated.
Mike
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Mike '80 300D '84 300D '85 300D '87 300D 
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#3
08-05-2003, 01:55 AM
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My guess is the cabin temp sensor is stuck thinking it's winter. If the wires were disconnected or the temp sensor was an open circuit, the resistance would be really high/infinite suggesting a really cold cabin. Could be as simple as checking and cleaning the electrical connectors.
Sixto 95 S420 91 300SE 87 300SDL 83 300SD
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#4
08-05-2003, 06:44 AM
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sublettm, i have the same problem. the temp sensor underneath the little grate in the middle of the dash is kaput. need to order a new one...
before that make sure that the foam tube connecting the grate to the temp control relay is not deteriorated. take out glove compartment to access it.
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1984 300D Turbo - 231k....totalled 11/30/07 RIP Last edited by 84300DT; 08-05-2003 at 06:54 AM.
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#6
08-05-2003, 05:39 PM
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I had a similar problem years ago (about 12) in my 190D. The problem was that one of the two pots that are rotated when the tumbler temp wheel is rotated to adjust temp had become disconnected from the circuit board. A simple re-solder solved all of my problems.
It is my understanding that the interior temp sensor rarely goes bad, it is generally the pump that pulls air beyond the inside temp sensor. With a bad pump, you get inaccurate readings, but not grossly inaccurate readings. Hope this helps.
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Jovan '84 (11/83) 190D 2.2 5-Speed; Silver/Blue; Motor No. 00354, 402k mi (340+kmi mine) '89 Porsche 911 Turbo Coupe; Black/Black; 53kmi '05 BMW 530i 6-Speed; 302kmi '19 Range Rover; 30kmi
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Linear Mode
