68 AC needs freon - Team Camaro Tech
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post #1 of 7 (permalink) Old Jul 29th, 11, 05:54 PM Thread Starter
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Ed
 
Join Date: Jun 2004
Location: Northern CA
Posts: 463
68 AC needs freon

My 68 factory AC doesn't seem as cold as it used to be. I have a few cans of R12 that came with the car but it's been a long time since I've charged a system.

I've looked on eBay and they sell the can tap and hose for $10.

I also know I need to figure out which is the low and high pressure.

So my question: can someone tell me which is the factory low connection and do I need a gauge or can do I just hook up the can run the AC? How do I know when it's done?

Sorry for the basic questions. It's been a long time.

Thanks!
Ed
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post #2 of 7 (permalink) Old Jul 29th, 11, 08:08 PM
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Join Date: Aug 2001
Location: Dallas, Texas
Posts: 847
Re: 68 AC needs freon

If you have the Chevrolet Service Manual for your car it shows a lot of drawings & photos concerning your ac system.

The low port is located on your POA valve & should have a metal dust cap screwed down on it, kind of like a dust cap on a tire.

The POA valve is sitting almost on top of the fiberglass evaporator "suitcase," sandwiched between the case & the blower motor. It has a pipe coming out the front & back.

The high side port is located on the compressor muffler. It should also have a cap screwed down on it.

I can't answer your other questions about charging the system because I'm too new at this myself.

Also, if you can get a Camaro Assembly Manual, it has great exploded views of your ac.

I'm sure other (more knowledgeable) guys will chime in soon.


Good Luck.
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post #3 of 7 (permalink) Old Jul 29th, 11, 09:43 PM Thread Starter
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Ed
 
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Re: 68 AC needs freon

Thanks. I'll check the manual in the morning.
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post #4 of 7 (permalink) Old Jul 29th, 11, 10:33 PM
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JAY
 
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Re: 68 AC needs freon

Greetings from Arizona
your 68 may have two different sizes of charging ports, the smaller one is the High side and not to be charged with. Your local parts store may have a can tap and hose unit for sale. Once you ID low side, you can charge thru low side, I'd do 1 can only, don't think there is sight glass on receiver dryer to see if it clears up, other option is take to your local ac shop and have them recharge using your freon. Jay


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post #5 of 7 (permalink) Old Jul 29th, 11, 11:04 PM
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John
 
Join Date: Feb 2004
Location: Bloomingdale, Il
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Re: 68 AC needs freon

ED, I agree with Jay. Run it by a shop to have them evaluate your system.

In most cases you really need to put a set of gauges on the A/C system to check the preformance. The problem might not be the freon charge at all. Any A/C tech will tell you that simply dumping in another can of refrigerent isn't a cure-all for mild performing systems. It is really easy to over charge these small systems if you aren't familiar with them. Then the bad stuff starts hapening... slugged compressors, split cores, blown seals, etc. R12 is too dammmed expensive to blow away!

Take it to a real automotive AC place. Not a fix-all repair facility. A couple bucks for experienced shop labor could just save you a bunch of money in the end!....Jb

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Last edited by Johnny B; Jul 29th, 11 at 11:19 PM.
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post #6 of 7 (permalink) Old Aug 2nd, 11, 06:30 AM
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Michael
 
Join Date: Apr 2010
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Re: 68 AC needs freon

For what it's worth..

Clean off the sight glass on your receiver/dryer, start your car and turn on the air.

If the sight glass shows bubbles or is cloudy, you most likely need freon.
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post #7 of 7 (permalink) Old Aug 2nd, 11, 01:17 PM
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Tom
 
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Re: 68 AC needs freon

Quote:
Originally Posted by emdoller View Post
My 68 factory AC doesn't seem as cold as it used to be. I have a few cans of R12 that came with the car but it's been a long time since I've charged a system.

I've looked on eBay and they sell the can tap and hose for $10.

I also know I need to figure out which is the low and high pressure.

So my question: can someone tell me which is the factory low connection and do I need a gauge or can do I just hook up the can run the AC? How do I know when it's done?

Sorry for the basic questions. It's been a long time.

Thanks!
Ed
If you don't have real knowledge and experience in the proper methods of automotive AC, please take a class or hire a professional.


Tossing in a can with a charge hose can give you a very wide range of results from, cold air for a while or could result in your family and friends calling you stumpy after you blow your hand off.

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