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1979 300SD gray 1979 300SD ivory 1983 300D blue 1998 E320 green
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5 Posts
I understand the difference between the two systems. My car does not have any fault codes. I'm still wondering why would a 1998 use r12?
 

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1999 Mercedez Benz E320 4-Matic Sedan
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49 Posts
Working on my 1999 e320 4matic sedan. AC went out a few years ago and I didnt do anything. At the time it went from cold, to cooling only on drivers side to no cooling. I want to revive the system so I followed code reading procedure but got no codes. 3 yrs ago when the system went out I did get codes (no clue where I put those). How come no codes? thnx
 

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2010 E3504matic , 1998 E320
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52 Posts
I've been working on my '98 E320 and have it to the point where I'm ready to tackle the ac system and hoping posting here can help get my ac troubles straightened out.

Started out with only warm air when I'd turn on my air conditioning, so I added a can of R134a and my compressor did engage....great! Noticing it turned off after a couple of minutes, I go my garage to get it on the gauges & evacuate the system. It held -30lbs for 15 minutes, so there's no leak. I added R134a and the a/c blows great for about 5 minutes, but then quits. The one thing I'm not sure of is how much R134a went in as I didn't have my scale handy.

I pulled the following sensor values with no error codes.

1 25
2 28
3 24
4 24
5 62
6 81
7 16
8 61
9 01
10 6
11 4.4
12 4.3
20 5.3
21 06
24 13.1
40 71
41 34
42 72
43 152

Any ideas on where to look next to get it working properly?
 

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Premium Member
1998 E320 base sedan @ 160kmiles
Joined
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6,362 Posts
I've been working on my '98 E320 and have it to the point where I'm ready to tackle the ac system and hoping posting here can help get my ac troubles straightened out.

Started out with only warm air when I'd turn on my air conditioning, so I added a can of R134a and my compressor did engage....great! Noticing it turned off after a couple of minutes, I go my garage to get it on the gauges & evacuate the system. It held -30lbs for 15 minutes, so there's no leak. I added R134a and the a/c blows great for about 5 minutes, but then quits. The one thing I'm not sure of is how much R134a went in as I didn't have my scale handy.

I pulled the following sensor values with no error codes.

1 25
2 28
3 24
4 24
5 62
6 81
7 16
8 61
9 01
10 6
11 4.4
12 4.3
20 5.3
21 06
24 13.1
40 71
41 34
42 72
43 152

Any ideas on where to look next to get it working properly?
The item 5 is 62 which is the evaporator temperature sensor. It indicates 62 degrees C which is far too high. You don't have hot air blowing from the vents at 143 degrees F, do you ?

I believe there are stickies on how to do it at the top of this forum.
 

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1999 Mercedez Benz E320 4-Matic Sedan
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49 Posts
1999 W210 e320 4Matic Sedan AC had been empty for years so I charged the system (with oil). Worked great for 10 min then all the Refrigerant Gas came out under pressure pssssssssssssss (pressure release valve Im guessing). Any ideas? I do a lot but dont mess with AC. What failure should I suspect when bringing to my indie?
 

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Premium Member
1998 E320 base sedan @ 160kmiles
Joined
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6,362 Posts
1999 W210 e320 4Matic Sedan AC had been empty for years so I charged the system (with oil). Worked great for 10 min then all the Refrigerant Gas came out under pressure pssssssssssssss (pressure release valve Im guessing). Any ideas? I do a lot but dont mess with AC. What failure should I suspect when bringing to my indie?
Ask the indie to vacuum the system and test for leaks. Possible dried seals.
 

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2010 E3504matic , 1998 E320
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52 Posts
The item 5 is 62 which is the evaporator temperature sensor. It indicates 62 degrees C which is far too high. You don't have hot air blowing from the vents at 143 degrees F, do you ?

I believe there are stickies on how to do it at the top of this forum.

No I don't believe it's at 143 degrees....lol. I just pulled another set of sensor values this morning before running the car with sensor 5 reading 66.

Looks like I'll be reading the stickies on evap temp sensor replacement. Thank you for the information. :)
 

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1 Posts
I've got a 2001 e320 and had similar issue and this is how remedied. Turn ac on low/ auto and rev engine at a constant 4,000rpm for 3 to 5 min and you will feel the cold air kick in. Release foot off the gas and good to go.
 
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