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#1
02-27-2006, 03:36 PM
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Evaporator temp sensor and AC
I know this is early, but I want to take care of this prior to spring. It can get hot here in Texas during this time. It was in the 70's yesterday.
My 1986 420sel A/C is working intermittently. I started this project last year, but did not finish it. I replaced the accumulator. Vacuumed and charged it with R12. When I bypass the Klima relay with jumping pin 5 and 7 (I think?), the A/C blows cold. I check the low pressure switch with a multimeter, it is good(circuit is closed). I think I narrowed it down to either the Klima relay or the evaporator temp sensor. I did try the cube method, still didn't work. So it mustn't be the Klima? I have pulled the driver side center pad to expose the evaporator temp sensor/relay. I still cannot locate this. I see the expansion valve above the gas pedal. I see the black BEhr housing that the evaporator is in. There is a pink small cylinder(vacuum device?) near the expansion valve. Where is this sensor? I read it is 10 inches going back from the gas pedal. Can't find it. Does this model even have one? Frustrated, John 
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#2
02-27-2006, 04:15 PM
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It's encased in a black foam "clamshell" right by the expansion valve area.
See post #3: Please tell me what the e.t.r. swich looks like! Pink cylinder is a vacuum actuator for the foot flaps.
__________________
The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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#3
03-06-2006, 02:33 PM
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What's is the clam shell?
As above. The only thing I see is a two tone barrel cylinder about 5 inches away from it. I will try to take a picture.
John
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#4
03-10-2006, 12:58 PM
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picture of expansion valve area
Here is the picture of my expansion valve area. Is the ETR in the pink cylinder?
Thanks, John
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#5
03-10-2006, 12:59 PM
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picture
Sorry, for the small picture. I had to crop it to fit the max file size for this site.
John
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#6
03-10-2006, 01:52 PM
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Photo of '86 420SEL - ETR Switch - located at this sites "BuyParts" section:
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1EQ0PTV2S1R30TNBLJ&year=1986&make=MB&model=420-SEL-001&category=R&part=A%2FC+E.T.R.+Switch
__________________
Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein"
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