an AC dilemma
06-28-2007, 02:37 PM
#26
MBWorld Fanatic!
sensor 2
It reads 40c=104f so something must be wrong with that sensor if that is what its reporting.call a supply shop ,dealer,autohauza etc. and explain that you need the outboard temp sensor that goes to the a/c.
what temp was it last evening?run the tests with a thermo handy to get an accurate reading
ohlord
what temp was it last evening?run the tests with a thermo handy to get an accurate reading
ohlord
06-28-2007, 07:30 PM
#27
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It reads 40c=104f so something must be wrong with that sensor if that is what its reporting.call a supply shop ,dealer,autohauza etc. and explain that you need the outboard temp sensor that goes to the a/c.
what temp was it last evening?run the tests with a thermo handy to get an accurate reading
ohlord
what temp was it last evening?run the tests with a thermo handy to get an accurate reading
ohlord
Leon
06-28-2007, 11:47 PM
#30
MBWorld Fanatic!
converted the numbers
1.81 inside temp working system values 73
2.108 outside temp 75
3.70 left heater core 64
4.63 right heater core 64
5.70 evap temp 33
6.207 engine coolant temp 191
7.13 refrigerant pressure 15
8.142 refrigerant temp 112-121
code 1227 Outside Temperature Sensor Malfunction no codes
So is it 108 f outside?
posted values above are yours converted to f and mine from a known working system your evap temp is warm,and your outside temp is hot unless it was really 108f.Call the dealer for a part number for that sensor............
will keep you posted and let's not give up.
aut vincere aut more latin for--- To conquer or die --
ohlord
Lexrex's program like he said may need tweaking on this one,did you run the flap test?was it all working fine before you did the relay repair,could you have left something loose etc.?
ohlord
2.108 outside temp 75
3.70 left heater core 64
4.63 right heater core 64
5.70 evap temp 33
6.207 engine coolant temp 191
7.13 refrigerant pressure 15
8.142 refrigerant temp 112-121
code 1227 Outside Temperature Sensor Malfunction no codes
So is it 108 f outside?
posted values above are yours converted to f and mine from a known working system your evap temp is warm,and your outside temp is hot unless it was really 108f.Call the dealer for a part number for that sensor............
will keep you posted and let's not give up.
aut vincere aut more latin for--- To conquer or die --
ohlord
Lexrex's program like he said may need tweaking on this one,did you run the flap test?was it all working fine before you did the relay repair,could you have left something loose etc.?
ohlord
Last edited by ohlord; 06-29-2007 at 03:07 PM. Reason: more info
06-29-2007, 03:11 PM
#31
MBWorld Fanatic!
values
your numbers are on the left and mine are on the right side.
Lexrex......any thoughts?
ohlord
Lexrex......any thoughts?
ohlord
06-29-2007, 03:24 PM
#32
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1.81 inside temp working system values 73
2.108 outside temp 75
3.70 left heater core 64
4.63 right heater core 64
5.70 evap temp 33
6.207 engine coolant temp 191
7.13 refrigerant pressure 15
8.142 refrigerant temp 112-121
code 1227 Outside Temperature Sensor Malfunction no codes
So is it 108 f outside?
posted values above are yours converted to f and mine from a known working system your evap temp is warm,and your outside temp is hot unless it was really 108f.Call the dealer for a part number for that sensor............
will keep you posted and let's not give up.
aut vincere aut more latin for--- To conquer or die --
ohlord
Lexrex's program like he said may need tweaking on this one,did you run the flap test?was it all working fine before you did the relay repair,could you have left something loose etc.?
ohlord
2.108 outside temp 75
3.70 left heater core 64
4.63 right heater core 64
5.70 evap temp 33
6.207 engine coolant temp 191
7.13 refrigerant pressure 15
8.142 refrigerant temp 112-121
code 1227 Outside Temperature Sensor Malfunction no codes
So is it 108 f outside?
posted values above are yours converted to f and mine from a known working system your evap temp is warm,and your outside temp is hot unless it was really 108f.Call the dealer for a part number for that sensor............
will keep you posted and let's not give up.
aut vincere aut more latin for--- To conquer or die --
ohlord
Lexrex's program like he said may need tweaking on this one,did you run the flap test?was it all working fine before you did the relay repair,could you have left something loose etc.?
ohlord
Leon
Last edited by Down South; 06-29-2007 at 07:20 PM.
06-29-2007, 09:27 PM
#33
MBWorld Fanatic!
Okay
replace the outboard ambient temp sensor,17 bucks at the dealer,replace the evap temp sensor 36 something at autohausaz,then your evap temp should drop down near 35f or so.check your r134 fill even tho your pressure seems spot on at current reading.What does your dash display read for outside temp,compared to a known thermo?
where the heck are you that it's 95?
the evap temp sensor still seems faulty if it is reading 70,but lexrex program seems to indicate you are operating okay and we know that not to be true.this model is known for failed evap sensors so maybe it's oh so close.
For 60 bucks or so and some of your time these are worth a try.did you run the flap test?what is the function of the relay you replaced? and could it be faulty?
ohlord
p.s. run the drivers seat all the way back,cuz there is not alot of room to crawl under the dash to replace the evap sensor....
where the heck are you that it's 95?
the evap temp sensor still seems faulty if it is reading 70,but lexrex program seems to indicate you are operating okay and we know that not to be true.this model is known for failed evap sensors so maybe it's oh so close.
For 60 bucks or so and some of your time these are worth a try.did you run the flap test?what is the function of the relay you replaced? and could it be faulty?
ohlord
p.s. run the drivers seat all the way back,cuz there is not alot of room to crawl under the dash to replace the evap sensor....
06-29-2007, 09:41 PM
#34
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replace the outboard ambient temp sensor,17 bucks at the dealer,replace the evap temp sensor 36 something at autohausaz,then your evap temp should drop down near 35f or so.check your r134 fill even tho your pressure seems spot on at current reading.What does your dash display read for outside temp,compared to a known thermo?
where the heck are you that it's 95?
the evap temp sensor still seems faulty if it is reading 70,but lexrex program seems to indicate you are operating okay and we know that not to be true.this model is known for failed evap sensors so maybe it's oh so close.
For 60 bucks or so and some of your time these are worth a try.did you run the flap test?what is the function of the relay you replaced? and could it be faulty?
ohlord
p.s. run the drivers seat all the way back,cuz there is not alot of room to crawl under the dash to replace the evap sensor....
where the heck are you that it's 95?
the evap temp sensor still seems faulty if it is reading 70,but lexrex program seems to indicate you are operating okay and we know that not to be true.this model is known for failed evap sensors so maybe it's oh so close.
For 60 bucks or so and some of your time these are worth a try.did you run the flap test?what is the function of the relay you replaced? and could it be faulty?
ohlord
p.s. run the drivers seat all the way back,cuz there is not alot of room to crawl under the dash to replace the evap sensor....
I replaced the ambient temp sensor already, it's the one in the pic a few posts upwards. I will order the evap temp sensor tonight and try that out. The blower motor regualtor was what I replaced from the tutorial on this site. My dash is reading anywhere between 88 to 92 depending on the time of day. I haven't check to a known thermo, I don't have one. I haven't had the chance to run the flap test yet, will probably give a run tomorrow. Is the evap temp sensor in the car? I thought it would be under the hood! How do I check the r134 fill level? I'm in South Florida...
06-29-2007, 11:24 PM
#35
MBWorld Fanatic!
a/c
the evap sensor is under the drivers side dash,instructions under my post about a/c tips it's about a one hour job and easy except the lack of room to move around and make sure you have a headlamp on it makes it easy to locate everything.You are probably better off if you don't have the proper guages to have an a/c shop check the 134 fill,or you can buy a kit at most auto parts stores that has all you need plus instructions.kits cost like 30 or so.If you're not sure have the shop do it.when you get the evap sensor,pm me and I'll talk you through it online or by cell phone if need be,its really a piece of cake if you have someone explain what you are looking for.
ohlord
ohlord
06-29-2007, 11:41 PM
#36
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the evap sensor is under the drivers side dash,instructions under my post about a/c tips it's about a one hour job and easy except the lack of room to move around and make sure you have a headlamp on it makes it easy to locate everything.You are probably better off if you don't have the proper guages to have an a/c shop check the 134 fill,or you can buy a kit at most auto parts stores that has all you need plus instructions.kits cost like 30 or so.If you're not sure have the shop do it.when you get the evap sensor,pm me and I'll talk you through it online or by cell phone if need be,its really a piece of cake if you have someone explain what you are looking for.
ohlord
ohlord
on ths post.Leon
06-29-2007, 11:58 PM
#37
Super Member
I think you need to take it in to a mechanic. The first thing the mechanic would have done is replace the outside temp sensor, which you did yourself and saved a few bucks. You've already ruled out that sensor as the cause.
It's difficult to assess your problem because I don't know what measurement units your climate control uses. Most W210 have Fahrenheit for temperature and bar for pressure. Yours obviously uses Celsius for temp, but it's not clear whether pressure is bar or psi. If your refrigerant pressure is in fact reported in units of psi, then it's way too low. Low pressure means you either have a leak or a faulty compressor. On a hot day, the pressure should be at least 8 bar or ~115 psi.
A refrigerant leak is consistent with your evap, right & left temp sensor readings. The A/C is cooling the air just barely from 80 degrees outside to 70 inside.
I do not see any evidence that your evap temp sensor is bad.
It's difficult to assess your problem because I don't know what measurement units your climate control uses. Most W210 have Fahrenheit for temperature and bar for pressure. Yours obviously uses Celsius for temp, but it's not clear whether pressure is bar or psi. If your refrigerant pressure is in fact reported in units of psi, then it's way too low. Low pressure means you either have a leak or a faulty compressor. On a hot day, the pressure should be at least 8 bar or ~115 psi.
A refrigerant leak is consistent with your evap, right & left temp sensor readings. The A/C is cooling the air just barely from 80 degrees outside to 70 inside.
I do not see any evidence that your evap temp sensor is bad.
Last edited by lexrex; 06-30-2007 at 12:03 AM.
06-30-2007, 12:20 AM
#38
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I think you need to take it in to a mechanic. The first thing the mechanic would have done is replace the outside temp sensor, which you did yourself and saved a few bucks. You've already ruled out that sensor as the cause.
It's difficult to assess your problem because I don't know what measurement units your climate control uses. Most W210 have Fahrenheit for temperature and bar for pressure. Yours obviously uses Celsius for temp, but it's not clear whether pressure is bar or psi. If your refrigerant pressure is in fact reported in units of psi, then it's way too low. Low pressure means you either have a leak or a faulty compressor. On a hot day, the pressure should be at least 8 bar or ~115 psi.
A refrigerant leak is consistent with your evap, right & left temp sensor readings. The A/C is cooling the air just barely from 80 degrees outside to 70 inside.
I do not see any evidence that your evap temp sensor is bad.
It's difficult to assess your problem because I don't know what measurement units your climate control uses. Most W210 have Fahrenheit for temperature and bar for pressure. Yours obviously uses Celsius for temp, but it's not clear whether pressure is bar or psi. If your refrigerant pressure is in fact reported in units of psi, then it's way too low. Low pressure means you either have a leak or a faulty compressor. On a hot day, the pressure should be at least 8 bar or ~115 psi.
A refrigerant leak is consistent with your evap, right & left temp sensor readings. The A/C is cooling the air just barely from 80 degrees outside to 70 inside.
I do not see any evidence that your evap temp sensor is bad.
On a not so hot day what should the psi be roughly?
06-30-2007, 01:30 AM
#39
MBWorld Fanatic!
lexrex
Knew you would have more to offer,that's why I asked about the evap sensor reporting a converted to Fahrenheit temp of 70 degrees.normal evap temp should be around 33-35 right? if not then maybe down south is due for a trip to the shop.
ohlord
ohlord
06-30-2007, 02:23 AM
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I ordered the sensor already, when it comes, I'll drop it in and see what happens. I will bring it to a Mercedes specialist on Monday to have it looked over.
06-30-2007, 01:38 PM
#41
Super Member
I can't give you exact figures since the pressure depends on (a) how much refrigerant is in the system and (b) the temperature, but I wouldn't ever expect the pressure in a fully charged system to drop below 40 PSI (3 bar) even with the AC off on a cool day. For the pressure to drop down near 15 PSI, you're talking about temperatures in the single digits or below zero.
Replacing the evap sensor is not necessarily money down the drain... Those things fail so often that you might have needed a new one anyways a couple months down the road.
Replacing the evap sensor is not necessarily money down the drain... Those things fail so often that you might have needed a new one anyways a couple months down the road.
Last edited by lexrex; 06-30-2007 at 01:42 PM.
06-30-2007, 04:41 PM
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07-03-2007, 04:40 PM
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I'M HERE AT WORK BRAINSTORMING AND SOMETHING CAME TO MIND THAT I DIDN'T REMEMBER TO MENTION BEFORE. Several months ago when the AC first started acting up, I ran the diagnostics and came up with the code for the refrigerant temp sensor which I no longer get. Do you think this could be adding to my situation?
Leon
Leon
1999, actuatore320, air, blows, conditioning, e320, flap, hissing, moisture, refrigerant, reset, side, temperature, vent, w210, warm
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