AC freon charge

gfreek · 06-28-2005, 01:38 AM

Since there is no site glass on the AC system,( 95 SL), how do you know how much to add? Not quite as cold as it should be.

**Ssicarman** · 06-28-2005, 02:05 AM

The AC system is filled by weight of R-134. With modern cars this needs to be very precise. To much and the system will not work and possible damage will occur. Not enough and the system will not cool properly. There will be a sticker on the beam over the rad. It will have the system charge on it.

goochs · 06-28-2005, 07:46 PM

You normally would have to pump out the freon into a measuring device that will weigh it then put it back in and add the amount missing. PROBLEM is most people just add freon until it cold and usually overcharge the system which will put a tremdous load on the engine, the compressor and seals and usually be the demise of the compressor. Take it to a known good ac guy to repair it.

gfreek · 06-29-2005, 12:35 PM

There is no capacilty label for the AC under the hood. You know what it is?

goochs · 06-30-2005, 12:11 AM

Quote:

Originally Posted by gfreek

There is no capacilty label for the AC under the hood. You know what it is?

In my factory air on a 97 sl2 it says 1.32 lbs.
If the air was added aftermarket I don't know what it would be.

gn85 · 06-30-2005, 12:18 AM

Quote:

Originally Posted by gfreek

There is no capacilty label for the AC under the hood. You know what it is?

Was your car involved in an accident? Have aftermarket front end parts? It's possible that the sticker is no longer there. I found my information on a sticker up front.

ian12 · 06-30-2005, 01:22 AM

whatever you do, do not attempt to go buy that crap from a store that you just press a button to fill the system. you need gauges and the cans to charge it. if you have never charged an a/c system dont try yourself because it does need to be precise or overcharge can cause leaks or much bigger damage, and undercharge wont cool. also possibly the system has a leak so an uv die should be put in to check for leaks at the moment its charged or for later help if it tends to leak.

FeeJ · 06-30-2005, 12:57 PM

not to hijack but I do have a similar question on the topic...

I've a '91 SL1 with a/c thats never run as long as I've had it because of a complete lack of R-12 (which is too expensive to even think about), whats it take to convert to R-134 safely and simply, so I can stop using my 4x60 a/c?

goochs · 06-30-2005, 01:29 PM

Quote:

Originally Posted by FeeJ

not to hijack but I do have a similar question on the topic...

I've a '91 SL1 with a/c thats never run as long as I've had it because of a complete lack of R-12 (which is too expensive to even think about), whats it take to convert to R-134 safely and simply, so I can stop using my 4x60 a/c?

You will need to change fittings (suction and high pressure) CHANGE the accumulator/drier.. get as much old r12 oil out of the system.. recharge the oil and freon 134 once it has been pumped down to a vacuum. I had a 95 bonneville converted and it cost me right around $250

Revolver · 06-30-2005, 02:05 PM

If you only need a little more cooling capability, buy Maxi-Cool. It is a 3 oz. can and when you add it the temp. inside the car will lower by about 6-10 degrees. I have added it to over 10 cars now and eveyone that has used it loves it. It costs $7 at Autozone.