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Old 07-23-2001, 09:43 AM
Join Date: Sep 2000
Location: Sugarland, TX
Posts: 285
My 95-S320 A/C is a little low, and tried to recharge the system. But was unable fill freon into the system. I connected both high/low pressure connection, and turn on valves on quick connect. The low pressure was about 30, and the high pressure is about 225.

I am charging the system from the low pressure side, am I doing something wrong?


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Old 07-23-2001, 09:12 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
You should only turn on the low side valve when charging. Be sure to turn on the valve at the gauge as well. This allows the low pressure line and the can to be connected.
Donnie Drummonds
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Old 07-23-2001, 09:22 PM
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'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,933
. . . monitor your results

If the sight glass shows 'bubbles' when the A/C is running, then it might need a charge. If the temp/humidity is high, then a 'few' bubbles are ok.

To monitor the A/C system, check my page (red house) and click on menu #14. Perform the 'Operational Checks' described to check the temps/pressures in the A/C. With the car running, check the evaporator temperature (press REST button five (5) times), sb cycling from 37F to 42F. If so, everythings ok.

[Edited by JimF on 07-23-2001 at 08:29 PM]
Regards . . . . JimF
'94 S500 Cpe

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Old 07-24-2001, 08:50 AM
Join Date: Sep 2000
Location: Sugarland, TX
Posts: 285
update on a/c charge

Thank you for the reply, the problem I have put the supply line backward, the needle pressure valve was installed wrong on the menifold, disable freon flow from tank to low pressure connection.


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