rajramineni

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.

AMG10

First if you need to recharge the a/c you may have a leak somewhere. You can charge it but it will most likely go down again. Go to a A/C shop and have it checked.

rajramineni

I have finished recharging and now i am getting the cold air from the vents.

ashutt

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.

rajramineni

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.

ashutt

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?

MarcusF

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.

ashutt

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.

MarcusF

Unfortunately, I can't get to my repair CDs from where I am.

ashutt

Can anyone point me to the location of the low side port for recharging the AC? Thanks in advance.

rajramineni

see the attachment pic.

its on the driver side near washer fluid.

ashutt

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.

rajramineni

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.

ashutt

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?