Att: Techs... A/C Problem
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Newbie
Joined: May 2003
Posts: 7
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From: New Jerz
97 E320
Att: Techs... A/C Problem
Att: Techs....
I have a 1997 E-320. The air conditioning is not working... The economy light stays on and can not be turned off. A mercedes tech told me that the refrigerant needs to be refilled and another tech told me the control unit is bad. One day i turned on my A/C and i heard a hissing noise. How can this problem be fixed? Can someone help me? What parts are needed?
I have a 1997 E-320. The air conditioning is not working... The economy light stays on and can not be turned off. A mercedes tech told me that the refrigerant needs to be refilled and another tech told me the control unit is bad. One day i turned on my A/C and i heard a hissing noise. How can this problem be fixed? Can someone help me? What parts are needed?
Newbie
Joined: Feb 2003
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2010 X204 GLK350 4matic
Does the A/C compressor engage when car starts?
I had a problem where AC would engage briefly when the car is started but then stop working (fan worked and blew out ambient temperature air). There was no refrigerent leak.
I was worried about having to replace the evaporator (supposedly a big-time labor charge) but it turned out to be a <$60 plastic temperature sensor of some kind. My independent shop guy told me that this part is a somewhat common failure in the E class.
Luck.
Not a tech guru by any means...
I was worried about having to replace the evaporator (supposedly a big-time labor charge) but it turned out to be a <$60 plastic temperature sensor of some kind. My independent shop guy told me that this part is a somewhat common failure in the E class.
Luck.
Not a tech guru by any means...
Super Member
Joined: Nov 2004
Posts: 588
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'98 E320 4Matic, '85 380SL
fast_car,
Your problem is most likely a faulty evaporator temperature sensor. Have you run the diagnostic to check the codes and actual sensor values? Post all the codes and post sensor values #3, #4, #5, #7 & #8 with the engine & A/C switched on.
Here are the instructions to access the diagnostics:
http://www.continentalimports.com/ser_ic40142.html
Your problem is most likely a faulty evaporator temperature sensor. Have you run the diagnostic to check the codes and actual sensor values? Post all the codes and post sensor values #3, #4, #5, #7 & #8 with the engine & A/C switched on.
Here are the instructions to access the diagnostics:
http://www.continentalimports.com/ser_ic40142.html
Almost a Member!
Joined: Apr 2004
Posts: 41
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1999 E320 / 1988 BMW 635Csi / 1987 Porsche 911 TL Cab Triple Black
AC blow cool air then blow ambient
Here is the code from my 1999 E320 with the engine & A/C switched on.
Does it mean I have a bad evap temp sensor, where is this sensor located ?
Thanks
The AC temp was set as 72 per instruction and car was park in side garage while I took this value
1 = 75
2 = 73
3 = 80
4 = 78
5 = 143
6 = 85
7 = 06
8 = 76
9 = 27
10 = 1.1
11 = 0.3
12 = 4.3
20 = 3.2
21 = 32
22 = 00
23 = 32
24 = 11.6
40 = 164
41 = 85
42 = 40
43 = 136
Does it mean I have a bad evap temp sensor, where is this sensor located ?
Thanks
The AC temp was set as 72 per instruction and car was park in side garage while I took this value
1 = 75
2 = 73
3 = 80
4 = 78
5 = 143
6 = 85
7 = 06
8 = 76
9 = 27
10 = 1.1
11 = 0.3
12 = 4.3
20 = 3.2
21 = 32
22 = 00
23 = 32
24 = 11.6
40 = 164
41 = 85
42 = 40
43 = 136
Super Member
Joined: Nov 2004
Posts: 588
Likes: 1
'98 E320 4Matic, '85 380SL
The problem is without a doubt your evaporator temp sensor. Your evaporator temp sensor (#5) is indicating 143 degrees, which is clearly impossible given that the outside air temp is 73 degrees and your left & right heater (#3 & #4) core temps are 80 and 78 degrees respectively.
The system thinks your A/C temp is 143 degrees. It's blowing ambient air because the outside air temp is much cooler than 143!
The system ignores the evaporator temp sensor data for the first 10 minutes of operation. The fault is characterized by your A/C quitting 10 minutes after the ignition is switched on.
I believe the sensor is installed in the airflow behind the evaporator case. Not sure how to access it. Maybe someone else can help with this. I had a shop replace mine; labor was minimal.
The system thinks your A/C temp is 143 degrees. It's blowing ambient air because the outside air temp is much cooler than 143!
The system ignores the evaporator temp sensor data for the first 10 minutes of operation. The fault is characterized by your A/C quitting 10 minutes after the ignition is switched on.
I believe the sensor is installed in the airflow behind the evaporator case. Not sure how to access it. Maybe someone else can help with this. I had a shop replace mine; labor was minimal.
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Almost a Member!
Joined: Apr 2004
Posts: 41
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1999 E320 / 1988 BMW 635Csi / 1987 Porsche 911 TL Cab Triple Black
Evap temp sensor locate
I bought the new sensor and now have to find where is located, I remove the panel under streeing wheel, but still can not find it
Can some one point where to look for
Car is 1999 E320
Thanks
Tan
Can some one point where to look for
Car is 1999 E320
Thanks
Tan
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Member
Joined: Apr 2005
Posts: 92
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From: San Jose, Ca.
2000 E430, 2001 Harley Fatboy
If the hissing was comming from the center vent area, it could be the Expansion valve #202-830-01-84 This is common and I beleive you need to remove dash to access it.
Super Member
Joined: Feb 2002
Posts: 782
Likes: 6
From: Buffalo NY
3 Porsche rotation
My wife;s 2002 E55 air condition is not cold at all too. I just ran the diagnostic and got these code,
1=76
2=75
3=75
4=67
5=73
6=152
7=06
8=82
9=31
I found #6 sensor is call ECT Sensor and the number seems high. What is ECT Sensor? And is this the problem? Any suggestion will be greatly appreciated.
John
1=76
2=75
3=75
4=67
5=73
6=152
7=06
8=82
9=31
I found #6 sensor is call ECT Sensor and the number seems high. What is ECT Sensor? And is this the problem? Any suggestion will be greatly appreciated.
John
Super Member
Joined: Nov 2004
Posts: 588
Likes: 1
'98 E320 4Matic, '85 380SL
ECT = engine coolant temperature; 152 means your car is partially warmed up
#5 is your evaporator temp sensor. This should be in the 30s, not ambient. So, the car agrees with you that the air isn't cold.
#3 & #4 are the temps of your left & right sides respectively.
#7 & #8 are your refrigerant pressure and temperature. #7 varies depending on how much compression is needed to cool your car. #8 always needs to be more than outside air temp (#2 = 75) to move heat from inside your car to the great outdoors. It is higher than the outside temp, so it looks like your A/C is working, but just barely.
You're probably low on refrigerant. Any hissing noises from the center vent? Is the passenger side center vent cooler than the driver side center vent? Oh, and the EC light is off, right?
#5 is your evaporator temp sensor. This should be in the 30s, not ambient. So, the car agrees with you that the air isn't cold.
#3 & #4 are the temps of your left & right sides respectively.#7 & #8 are your refrigerant pressure and temperature. #7 varies depending on how much compression is needed to cool your car. #8 always needs to be more than outside air temp (#2 = 75) to move heat from inside your car to the great outdoors. It is higher than the outside temp, so it looks like your A/C is working, but just barely.
You're probably low on refrigerant. Any hissing noises from the center vent? Is the passenger side center vent cooler than the driver side center vent? Oh, and the EC light is off, right?
Super Member
Joined: Feb 2002
Posts: 782
Likes: 6
From: Buffalo NY
3 Porsche rotation
Originally Posted by lexrex
ECT = engine coolant temperature; 152 means your car is partially warmed up
#5 is your evaporator temp sensor. This should be in the 30s, not ambient. So, the car agrees with you that the air isn't cold. #3 & #4 are the temps of your left & right sides respectively.
#7 & #8 are your refrigerant pressure and temperature. #7 varies depending on how much compression is needed to cool your car. #8 always needs to be more than outside air temp (#2 = 75) to move heat from inside your car to the great outdoors. It is higher than the outside temp, so it looks like your A/C is working, but just barely.
You're probably low on refrigerant. Any hissing noises from the center vent? Is the passenger side center vent cooler than the driver side center vent? Oh, and the EC light is off, right?
#5 is your evaporator temp sensor. This should be in the 30s, not ambient. So, the car agrees with you that the air isn't cold.
#3 & #4 are the temps of your left & right sides respectively.#7 & #8 are your refrigerant pressure and temperature. #7 varies depending on how much compression is needed to cool your car. #8 always needs to be more than outside air temp (#2 = 75) to move heat from inside your car to the great outdoors. It is higher than the outside temp, so it looks like your A/C is working, but just barely.
You're probably low on refrigerant. Any hissing noises from the center vent? Is the passenger side center vent cooler than the driver side center vent? Oh, and the EC light is off, right?
John
MBWorld Fanatic!
Joined: Nov 2001
Posts: 3,861
Likes: 3
From: Jacksonville Florida
209/W210 Estate /W211 modded by MBENZNL
Originally Posted by fast_car
I bought the new sensor and now have to find where is located, I remove the panel under streeing wheel, but still can not find it
Can some one point where to look for
Car is 1999 E320
Thanks
Tan
Can some one point where to look for
Car is 1999 E320
Thanks
Tan
Senior Member
Joined: Jul 2002
Posts: 340
Likes: 0
Originally Posted by JohnAMG
I didn't notice any hissing noise and the EC light is off. I will double check this afternoon when I get home. I suspect the refrigerant is low too. Thanks for your repsonse.
John
John
Super Member
Joined: Nov 2004
Posts: 588
Likes: 1
'98 E320 4Matic, '85 380SL
14-17 bar is possible on a really hot day, but you're unlikely to see pressures that high when it's in the low to mid 70s. Our A/C compressors are variable displacement, which helps with efficiency. This means they compress the refiregerant only as much as necessary to bring the evaporator temperature below 40 degrees.
You might also notice that your right side (#4) is quite a bit cooler than the left side (#3). When both sides are set to the same temp on the climate control, and the right side blows colder, this is symptomatic of low refrigerant.
You might also notice that your right side (#4) is quite a bit cooler than the left side (#3). When both sides are set to the same temp on the climate control, and the right side blows colder, this is symptomatic of low refrigerant.
Last edited by lexrex; Apr 22, 2006 at 11:25 PM.
Super Member
Joined: Feb 2002
Posts: 782
Likes: 6
From: Buffalo NY
3 Porsche rotation
Originally Posted by lexrex
ECT = engine coolant temperature; 152 means your car is partially warmed up
#5 is your evaporator temp sensor. This should be in the 30s, not ambient. So, the car agrees with you that the air isn't cold. #3 & #4 are the temps of your left & right sides respectively.
#7 & #8 are your refrigerant pressure and temperature. #7 varies depending on how much compression is needed to cool your car. #8 always needs to be more than outside air temp (#2 = 75) to move heat from inside your car to the great outdoors. It is higher than the outside temp, so it looks like your A/C is working, but just barely.
You're probably low on refrigerant. Any hissing noises from the center vent? Is the passenger side center vent cooler than the driver side center vent? Oh, and the EC light is off, right?
#5 is your evaporator temp sensor. This should be in the 30s, not ambient. So, the car agrees with you that the air isn't cold.
#3 & #4 are the temps of your left & right sides respectively.#7 & #8 are your refrigerant pressure and temperature. #7 varies depending on how much compression is needed to cool your car. #8 always needs to be more than outside air temp (#2 = 75) to move heat from inside your car to the great outdoors. It is higher than the outside temp, so it looks like your A/C is working, but just barely.
You're probably low on refrigerant. Any hissing noises from the center vent? Is the passenger side center vent cooler than the driver side center vent? Oh, and the EC light is off, right?
John
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Joined: Mar 2005
Posts: 3,187
Likes: 38
From: Right Behind You
1998 E430; 2007 Porsche 911 C4S Cabriolet; 2011 Expedition EL Limited; 2014 E350 Estate
What does the hissing noise canote? My AC stopped working 2 weeks ago and yes I heard a hissing noise when I tried to turn it back on again today
Edit - I pulled the codes from my car. They look to be in Celcius.
1 40
2 28
3 33
4 33
5 57
6 65
7 03
8 37
9 05
10 4.5
11 2.1
12 4.0
20 0.0
21 00
22 00
23 00
24 11.4
40 71
41 34
42 72
43 152
Error codes
Eb1234 <--- Sun Sensor, how would this failing affect my AC and whats the part replacement cost?
E FF <---- No idea what this means.
Edit - I pulled the codes from my car. They look to be in Celcius.
1 40
2 28
3 33
4 33
5 57
6 65
7 03
8 37
9 05
10 4.5
11 2.1
12 4.0
20 0.0
21 00
22 00
23 00
24 11.4
40 71
41 34
42 72
43 152
Error codes
Eb1234 <--- Sun Sensor, how would this failing affect my AC and whats the part replacement cost?
E FF <---- No idea what this means.
Last edited by MG; May 4, 2006 at 02:09 PM.
Super Member
Joined: Feb 2002
Posts: 782
Likes: 6
From: Buffalo NY
3 Porsche rotation
Finally the AC is fixed under warranty. A pipe line(210-830-46-15) was leaking and drained all the refrigerant, and I was told the hissing sound came from the empty refrigerant. The tech. also replace the tank(210-830-04-83) and if it was not for the warranty I would be out $500 dollars.
John
John
Last edited by JohnAMG; May 4, 2006 at 11:42 PM.
Super Member
Joined: Nov 2004
Posts: 588
Likes: 1
'98 E320 4Matic, '85 380SL
Originally Posted by MG
Eb1234 <--- Sun Sensor, how would this failing affect my AC and whats the part replacement cost?
Newbie
Joined: May 2006
Posts: 7
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2001 E320 (W210)
2001 E320 A/C problem
I have a 2001 E320 that makes a hissing sound when I turn the A/C on. I can't remember all my diagnostics readouts but I remember #7 being 05. Is this low for the freon? If so what should that number be?
Thanks
Thanks
Junior Member
Joined: Jan 2004
Posts: 59
Likes: 0
From: Big Valley
E430, Ferrari 360 Modena, BMW m3
if you over charge a refrigaration in a cars A/C will this blow hot air in the car as i try to recharge my e430 yesterday and now i'm having a reading of :
01=123
02=141
03=116
04=116
05=154
06=200
07=E
08=130
09=27
i just hope i did not mess up thing i have not since this numbers here
01=123
02=141
03=116
04=116
05=154
06=200
07=E
08=130
09=27
i just hope i did not mess up thing i have not since this numbers here
