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Accessing, Replacing Evaporator Temperature Sensor 92 300D 86 300SDL
Could it be that I'm the only one on this forum with not one but TWO bad evaporator temperature sensors? :D
According to PO, my 86 300SDL has a bad one (though I haven't experienced the symptom). On my 92 300D I think I may have a bad one...though I'm still thinking through possibilities. How do I access it? What's involved in replacing it? Thanks. |
That is one of the only A/C related switches that I have not replaced. From the description it sounds like it is in front of the evaporator, which is not very accessible. Maybe it is accessible from the glove box if you have one on the '92. I can't recall when the passenger air bag became standard.
This is the E.T.R. sensor which senses the cabin air temperature at the evaporator. 1 per car. Limited availability. |
I believe it's accessible from the driver's side footwell.
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Maybe this is where it is on the 92 (assuming all 124s are the same):
http://w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Climate/83-646.pdf |
Well that seems like it should be pretty easy. I just replaced my evaporator drains, had I known that was where it was I would have taken a picture.
How much is a new one? BTW, what are you symptoms that make you think you need new ones? Other than BC telling you that you do. |
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This would be "other than BC telling you that you do".:rolleyes: |
Don't know about the W124 but for the W126 you can access it from the driver's side foot well. I can't recall the exact location but it is effectively right near the expansion valve...maybe a bit lower and towards the center of the car. I have experience with an 84 so the appearance might have changed by 86.
On mine it appears as a 1X1X2 inch fuzzy looking insulated thing. Kind of odd looking and soft to the touch. You can't really miss it. In a sea of plastic it sticks out. It is screwed into the HVAC box with two Phillips head screws. When you remove them pull on it and the unit will come out. It has a long wire probe that extends into the evaporator which you will feel as you remove. Don't know the symptoms when these go bad but it is not usually an issue so I would think long and hard about spending $125 bucks. Maybe try a used unit from a junkyard. If the evaporator is freezing, it definitely sounds like it could be the source of your problems. Also, be careful when putting it back in. The two screws go directly into the HVAC plastic so thread the screws carefully. If you are really getting 28 degree vent temps maybe you should just leave it all alone!!! That is pretty chilly |
Except
28 Degree "F" vent temps positively assure Far Below FREEZING TEMPS @ the
Evaporator. (Hence,the lower transfer performance after protracted operation.) Southeasterngeorgiarednecktranslation: Y'all won't get 28 "F" vent temps for long before the evap freezes. |
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On the SDL, I haven't really had a problem. I can regulate the cabin temp with fan speed and vent positions. Haven't taken it on a long trip yet...first opportunity will be in August.
In fact, if it weren't for long trips, I think I really prefer the cold vent temp. |
On page 233 figure 6 there is a picture of the ETR location. It is a very large file.
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I just trying to learn what the symptoms of a bad E.T.R. are, no reason to get your panties in a bunch. |
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