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Old 06-27-2011, 02:59 PM
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Exclamation help with air conditioning

hi guys/girls...

ok some background...when i bought my baby (1987 420sel) 8 yrs ago, didn't have ac belt to drive the compressor.

put the belt on and never had ac....with the drought in west tx i have decided to recharge the system

it is r-12 at about 18.00 a can

i need help with the controls.....which buttons so i push to feel the cold air once we put the freon in the system??

today found a leak...tightened up the fitting...mech is going to mityvac the system in the near future to see if it holds vacuum....if it does then we recharge system



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Old 06-27-2011, 03:57 PM
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Turn the temperature control to a cold, (blue area) setting. Push the fan setting to high speed, (top button), although the center (auto) would be OK also. On the main control buttons, use the center button. After operation begins you might like the operation of the one to the left of center better. The button to right of center is for (E) for economy, no compressor. The far right is every thing off.
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Old 06-30-2011, 05:29 PM
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See other recent posts about the quality of available r12. Make sure you're using the real thing.
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Old 06-30-2011, 05:45 PM
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Location: Philadelphia
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Exclamation Before anything!!

Lyle my honest opinion is that you have a lot more reading to do before embarking on this and filling the system up. You can't just dump refrigerant in and hope it works. Here is a good place to start:

A/C recommendations for the MB vehicles

Huge list of very informative A/C DIY threads:
Climate Control:

First off, a vacuum test is not a very efficient way to test the integrity of an A/C system (certainly not a little handheld mityvac). The seals will not behave the same way under vacuum as they do under high pressure. It is a good way to initially boil off any moisture (and no way will you get that much pressure with a mityvac), but then you need to flush the entire system with dry air. You can pressurize the system with dry air (dry nitrogen, CO2 or R22) and see if it holds and THAT will be a decent test before dumping R12 into the system. Second, you will need to replace at least the receiver dryer after pulling a vacuum and flushing if its been sitting for that long. Third, you are required to have an EPA license (easy to get) to purchase R12 in the United States. Freeze 12 does not require a license because it is not R12. The reason R12 was banned/replaced is because it is very harmful to the atmosphere, and that is why they take this stuff so seriously. You can't just wing it and vent the R12 into the atmosphere in a trial-and-error process. I'm sorry if I'm coming off as extremely critical, but between this thread and your other one it is clear you need to read up a lot more on the whole process. R12 is a potent chemical. There are some extremely knowledgeable members on this board (I would not consider myself one, at least not for A/C...I only have a basic understanding of the system) who I'm sure will be happy to help out.
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Old 06-30-2011, 05:55 PM
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Location: central Texas
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Listen to TC or risk wasting a lot of money and time.
Run from that mechanic if he does not know that a mityvac is not appropriate for that procedure... not even close to effective.

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