AC Blows Hot
#1
Junior Member
Thread Starter
Join Date: May 2009
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
2001 CLK 55 AMG
AC Blows Hot
I did AC diagnostics using http://www.eclassbenz.com/acdiag
and found my ac pressure was 3 bar and i have to recharge it.
I bought Arctic Freeze R134a 18oz can with gauge.
I recharged it and now the reading says 8 bar.
I think thats still low.
the air is blowing little colder but not like 55 or 60. its doing 69-70 i guess.
and found my ac pressure was 3 bar and i have to recharge it.
I bought Arctic Freeze R134a 18oz can with gauge.
I recharged it and now the reading says 8 bar.
I think thats still low.
the air is blowing little colder but not like 55 or 60. its doing 69-70 i guess.
Last edited by rajramineni; 05-26-2009 at 05:23 PM. Reason: change
#4
Senior Member
Join Date: Aug 2005
Location: Las Vegas
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
2005 SL600 by SPEEDRIVEN
I am going to do this this weekend also. Was it hard or are there any special tips you can give as a result of your completing this task? Thanks in advance.
#5
Junior Member
Thread Starter
Join Date: May 2009
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
2001 CLK 55 AMG
If you know where the low pressure port is, you are all set to do it yourself.
Prerequisite: Perforrm diagnostics before doing a recharge using http://www.eclassbenz.com/acdiag
record the sensor readings and the above link will tell you if you really need to recharge or if there's something else wrong.
For A/c: its the sensor 7 which has the pressure reading, mine was at 3 when i checked and i understood i was running low on FREON.
Recharging took about like 20 minutes and when i rechecked sensor 7 reading it went to 12. I tried more but it didn't go up ( i got cold air, so i stopped).
Note :Shake that R134a Can every few seconds and check the gauge so you don't overfill.
Prerequisite: Perforrm diagnostics before doing a recharge using http://www.eclassbenz.com/acdiag
record the sensor readings and the above link will tell you if you really need to recharge or if there's something else wrong.
For A/c: its the sensor 7 which has the pressure reading, mine was at 3 when i checked and i understood i was running low on FREON.
Recharging took about like 20 minutes and when i rechecked sensor 7 reading it went to 12. I tried more but it didn't go up ( i got cold air, so i stopped).
Note :Shake that R134a Can every few seconds and check the gauge so you don't overfill.
#6
Senior Member
Join Date: Aug 2005
Location: Las Vegas
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
2005 SL600 by SPEEDRIVEN
I do not see the low side port for recharging. Can you tell me how to locate?
Also, I believe I am at 12 for sensor number 7, which is a little low. Looks like should be between 14 and 16.
How do you know when to stop adding the R134a?
Also, I believe I am at 12 for sensor number 7, which is a little low. Looks like should be between 14 and 16.
How do you know when to stop adding the R134a?
#7
MBWorld Fanatic!
I think it depends ‘when’ you are seeing the Freon pressure at 12 . On my car, when the car is started, and the AC is turned on, in park, without touching the gas, I see as high as 15. but it’s 7 while driving, and 11/12 while waiting at lights. On a hot day, my AC blows very cold air.
![](https://mbworld.org/forums/members/marcusf-albums-marcusf-picture603-cold.jpg)
Trending Topics
#8
Senior Member
Join Date: Aug 2005
Location: Las Vegas
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
2005 SL600 by SPEEDRIVEN
Thanks Marcus. Mine was at 12 at idle, in park and not touching the gas. I hear the hissing sound sometimes so I assume it is low.
Can you point me to where the low pressure port is so I can recharge today? Thanks in advance.
Can you point me to where the low pressure port is so I can recharge today? Thanks in advance.
#10
Senior Member
Join Date: Aug 2005
Location: Las Vegas
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
2005 SL600 by SPEEDRIVEN
Low side port for recharging AC Location
Can anyone point me to the location of the low side port for recharging the AC? Thanks in advance.
#12
Senior Member
Join Date: Aug 2005
Location: Las Vegas
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
2005 SL600 by SPEEDRIVEN
Thank you very much! Did you use the gauge in the car to determine when it was full? At what level would that be- 14 to 16? My bottle has the trigger lever and a gauge but not sure at what point it will be full. Thanks.
#13
Junior Member
Thread Starter
Join Date: May 2009
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
2001 CLK 55 AMG
i did it with Arctic Freeze 134a+ which has gauge. On that if you are in Blue zone under 45 psi, you are okay.
donot over fill. what kind of refrigerent do you have?
I checked in my car, it fluctuates between 11 and 12.
donot over fill. what kind of refrigerent do you have?
I checked in my car, it fluctuates between 11 and 12.
#14
Senior Member
Join Date: Aug 2005
Location: Las Vegas
Posts: 453
Likes: 0
Received 0 Likes
on
0 Posts
2005 SL600 by SPEEDRIVEN
Arctic Freeze 134a+ with the seperate triger and gauge for filling. Online says between 14-16 is good. Your amount seems low so how do you know that 45psi is to much?
2001, ac, amg, clk55, diagnostics, eclassbenzcom, forums, freon, installation, mercedees, mercedes, r134a, recharging, refrigerant, w208
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)