fast_car

Hello

Can some one tell me where is the evaporator temperature sensor mounted on the E320 1999, I remove the panel under streeing wheel, but still can not find it.

Please advise

Thanks
Tan

I found it .......... Thanks

MB Enthusiast

I am having the same problem.

Where did you find it?

mikejosh

Buy the new one first so you know what it looks like. I paid $40
for mine. You need to remove the plastic housing underneath the steering
column. There are 3 large screw and 1 small screw. You also will need
to pull the plastic pressure fitted plug from behing the accelerator
so you can remove it from the car. Unscrew the housing for the emergency
brake cable and slide the latch through the opening. There's also a diag
connector that needs to be removed. Slide the top (from behind the
cover) to the right and push the connector through from underneath. There's
a vent that comes off by turning the screw of half turn. The carpet cover
portion is simply pressure fitted. The part next to th console needs to
slide up so you can remove it. The sensor is attached to the evaporator just about in the middle the compartment about two feet up from the floor. It has a couple of wires attached to the connector. Pull the sensor out and then disconnect the cable. Attach the new one and reinsert. Just pay attention to how it was originally attached. It took me about 30 minutes of which 20 were spent figuring out how to disassemble the housing.

Mike_Shaw

Having the same problem. Can anyone upload a pic of the location? Thanks.

sean6543

Thanks for the write up mikejosh. One correction - it is the hood latch not the Em brake that needs unscrewed (at least in my car) . The most difficult part of this job was taking pics. Here are some pictures of my 1999 E55. My sensor cost $70.00

Here is the sensor. You only see about a 1/2" of it when it is intalled in the evaperator. (The end that is attached to the wires under my thumb)


This photo is looking towards the firewall/center console. The sensor is at the top of the green and red wires but is not seen in this picture.


Here my middle finger is touching the installed sensor, but it is impossible to see because every thing is black.

Big J

Great information. the question is after replacing the evaporator sensor do you need to reset anything at all? im still showing codes b1227,b1231,b1232,b1234.

sean6543

I can't answer that. Once the AC was cold again I never even went back and checked the codes.

Mr. B

Error B1227 - Outside Temperature Sensor Malfunction
Error B1231 - Engine Coolant Temperature Sensor Malfunction
Error B1232 - Refrigerant Pressure Sensor Malfunction
Error B1234 - Sun Sensor Malfunction

interesting… i’ve wondered the same thing myself… do these codes stay recorded or clear on their own after driving a while..??

i’m currently showing the last three error codes myself and wonder if i should just replace these sensors along with the evap temp sensor to be safe or not..??

i also show these error codes… which i can’t seem to identify… any help..??

Error B1459
Error B1422



~ Mr. B ~

Big J

Actually i took off the battery so it would reset, and the only thing that showed up after was Eb1232 the aircon did run but not as cold as it was

Mr. B

whats the other diagnostic numbers showing..??

sounds as if you might be low on freon

either that or a sensor has gone bad...
--------------------------------------------------------------------

mines intermittent or so it seems…

seems to be making cold air again but i haven’t really had it out during the heat of the day or working for more then 15 minutes. (just short drives)…

but i ordered the evaporator temp. sensor (autohausaz.com) and will wait to see if it stops producing cold air anytime (maybe weekend)… if so, we’ll try the new sensor to see if it’s the fix… keep ya posted.

hope this is it… but on the plus side, i am leaning stuff… and that’s always a good thing…


take care all,

~ Mr. B ~

Big J

A mechanic check the aircon today and put in some freon after that he said it was the compresor, then i told him that i put in 2 can of freon . as it turn out there is an too much air in the system. it works well now and did not change the refrigerant temperature sensor. the only sensor i change was the evaporator temperature sensor Thanks to all the info.........

Mr. B

Well the evaporator temperature sensor came in from autohausaz.com and although the system appeared to be working this past week… yesterday, it did act up after a long drive in 104*F temperatures… and once again the system was showing the “E” error code on # 7.

so i decided to change the evap. temp. sensor… when i removed the old one it looked different then the replacement… the replacement part is exactly like the one in sean6543’s picture above… but the one i removed had a wire harness about four inches long coming out of the temp. housing that plugs into the evaporator… also the case around the temperature probe was shaped different… but it installed the same way and it all went back together and seems to be working now.

i disconnected the battery (pos. + neg. for a couple of minutes)… trying to clear the trouble codes but no luck… the same codes remain…

how long do i need to leave it disconnected to clear the old codes..??



~ Mr. B ~

martyoh

Hi, I'm a newbie here. I have 2001 E320 1) AC is cold, but not as it can be and b) while testing to get error code or AC is used I noticed compressor was running constantly 10 minutes +.

I ran AC Diagnostic procedures got below.
75, 73, 40, 39, 40, 163, 10, 89

Code B1227 Explanation: This sensor measures the temperature outside your car. It is reporting an implausible temperature.
Code B1234 Explanation: This sensor detects strong sunlight and increases the fan speed slightly to compensate for solar gain. The sensor is located in the middle of the dash near the windshield. This sensor is not critical. Its failure would not interfere with normal A/C function.

Question1
Can someon advise me what I need to do?

Question2
How does changing Evaporator Temperature Sensor help?

Question3
What is usual suspect of Compressor running constantly? I have been using AC more and notice gas mileage suffered. I think Compressor running constantly maybe the culprit.

Thank you in advance

ohlord

better to start a new thread instead of dragging back a 3 year old and having us read all the way through it.
http://www.eclassbenz.com/node/27
run the test as directed.
with a right and left heater core temp as lo as they are and an eval temp at 40f,your system appears to be operating just fine.
Is it not blowing hard?Have you changed your cabin air filters?
Nothing indicates the evap sensor has a problem so why would you be considering changing it?
The a/c systwm in these cars is a variable system and the compressor cones on by demand if you want it off at a temp of 70 press the ec button and it will just allow ambient 70 f air in and the compressor will shut down.
ohlord

martyoh

ohlord,
Thanks for your quick reply.

better to start a new thread instead of dragging back a 3 year old and having us read all the way through it.
martyoh>>Sorry. I'll be sure to do that next time.

Nothing indicates the evap sensor has a problem so why would you be considering changing it?
martyoh>>Reading from previous members' comments I assumed that B1227 cure was to change out Evap sensor.

Is it not blowing hard?
martyoh>> It does not blow hard.

Have you changed your cabin air filters?
martyoh>> I bought the card used recently and doesn't seem so.
I'm curious. How is cabin filter related?

The a/c systwm in these cars is a variable system and the compressor cones on by demand if you want it off at a temp of 70 press the ec button and it will just allow ambient 70 f air in and the compressor will shut down.
martyoh>>I totally agree. However, if I had temp set to 70 in cool place like garage in the morning wouldn't compressor stop spinning after 10 minutes? I thought the compressor come on, but goes off after period of time after enough pressure has been generated by the compressor. The compressor does stop if I press EC button or turn off AC. Any additional comments are greatly appreciated.

ohlord

is the outside temp sensor,located in the vent next to the drivers side fog light.Looks like the end of a pen.Nothing to do with the evap sensor which most times don't throw a code,just toss off a default temp for value #5 like 135f.that way the compressor shuts down instead of freezing uop the evaporator.
run the tests again values 1-8 at the directions instructions and also the errors,then clear the errors while in error mode by pressing both auto buttons at the same time.
Lack of air flow on all settings can be the cabin filters are full of crud,diy on benzworld.org w210 section filters at autohausaz.com cabin and pollen filters .

they can get so filthy air can hardly pass through them.

martyoh

ohlord,

run the tests again values 1-8 at the directions instructions and also the errors,then clear the errors while in error mode by pressing both auto buttons at the same time.
martyoh>> I ran the both tests again and now I am getting only FF.
B1227 and B1234 are gone after reset/clearing.

Lack of air flow on all settings can be the cabin filters are full of crud,diy on benzworld.org w210 section filters at autohausaz.com cabin and pollen filters .
martyoh>> I have 103K miles and seen haven't been changed recently. Ordered new one via online.

Thanks for your help.

usaims

There were 3 pics of where the temp evap sensor is located on a 98 e320. Can somebody upload them again? Thanks.

Rod

ohlord

cover
http://w210.pietrzyk.net/disassembly_68inter_step5.htm
just the part of the video where he is removing the cover Not the steering wheel and the upper vent
Just the part where he is under the dash and pulling the screws and sliding out the parts to get the cover removed.
push the steering wheel in the outer most position and crawl (contort yourself)under the dash and with a flashlight look up along the trans hump ,you will see the end of the temp sensor sticking out of the side of the hump.If you have the new one handy you will know when you see it.

sean6543

Thanks for the write up mikejosh. One correction - it is the hood latch not the Em brake that needs unscrewed (at least in my car) . The most difficult part of this job was taking pics. Here are some pictures of my 1999 E55. My sensor cost $70.00

Here is the sensor. You only see about a 1/2" of it when it is intalled in the evaperator. (The end that is attached to the wires under my thumb)


This photo is looking towards the firewall/center console. The sensor is at the top of the green and red wires but is not seen in this picture.


Here my middle finger is touching the installed sensor, but it is impossible to see because every thing is black.

usaims

I really appreciate these pictures. I will try in the morning and will update this post, stand by.

usaims

I was able to replace the evap temp sensor and now my ac stay on, thank you so much for everybody's advice. I ran diag on it and I'm getting a new error code:
EB1230 which means implausible temperature reading. Do I need to clear out the existing codes or is this a new issue?

I do remember on the evap temp sensor (new), I accidentially and slightly bent the needle, but I bent it back. Here are my numbers:

23
32
24
26
2
87
13
48
eB1 230

Any clue?
Thanks.

ohlord

Since you replaced the evap temp sensor and all is working properly now,just clear (erase the error code) by pressing both auto buttons at the same time when in the error reading mode.
And don't make a habit of bending new parts in the future

usaims

I did, thank you so much! Now, I will battle the SRS light issue. According to my MB mechanic, he hooked a computer but it did NOT generate any codes for the SRS system, any clue?

usaims

porta

1 – 73
2- 107
3 – 73
4 – 71
5 – 138 <o:p></o:p>
6 – 191
7 – 15
8 – 125
<o:p> </o:p>
Eb1 227 Outside air temp (next to dr side fog light
Eb1 232 Refrig Pres Sens Malf
Eb1 233
Eb1 234 Sun Sensor Malf Not Critical
Eb1 425
<o:p> </o:p>
Blows cold for first several minutes, then compressor shuts off and fan blows ambient air.
Please advise.
Thank you in advance for your help.
Bill