Where to check freon - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 09-14-2009, 10:45 AM Thread Starter
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Exclamation Where to check freon

I have a 1999 mercedes slk 230 and i need to know where to check my freon level,because my a/c has stoped blowing cold air.
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post #2 of 3 (permalink) Old 09-14-2009, 05:21 PM
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Easy. Go look for your AC compressor. It should have a peep hole on top made of glass. When the AC is on and fully charged you will see freon fly across the glass, if not then you have a leak and need a recharge. Do you use your AC often or once in a while? The seals dry out if you dont use it and it begins to leak. Most likely you can charge the AC yourself using the Ultra Synthetic R134A freon at Walmart. $30 bucks a bottle and has a convenient gauge that detaches to tell you if its full or not according to the chart and the temperature you are at. Also freon is mixed with oil, and leak sealer so it stops your leak for you too. No need to mix chemicals. Plug in to low pressure port valve (blue screw cap) and turn on engine, shake can and press to refill. Thats it. Rev engine to fill it to max and you are done. Best to have two people. I just recharged all my cars AC systems myself. Its ice cold even in idle at stop lights in 90 plus degrees. Havent tried it in 117 degrees of Las Vegas heat yet. hehe. I hope it works there. PM me if you have any questions. I am not familiar with the SLK engine but will try to help ya if you wanna learn to recharge it yourself.

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post #3 of 3 (permalink) Old 09-14-2009, 05:32 PM
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It may even be easier than that, but first things first. Click the user cp link and complete your profile for vehicle and location because that is often useful information.

Second, this is the general forum, but if you have issues specific to your car -- which you do -- you are far better off posting (or searching) into the R170 forum as that is the forum specific to your car.

Third, if you have the electronic controls for your AC unit (I'm not sure when they made it into the 170) then you can check every important aspect of your system from the comfort of your seat. A link for it is in the 210 DIYs, may also be posted in the 170 forum.

At any rate, the worst thing you can do is just start dumping in refrigerant (and you don't have freon) because if you overpressure the system you can injure yourself and some expensive components.

Good luck...

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