I am speaking of my '79 SD. It's too hot again thsi summer and I've sworn tp myself that I'm going to have A/C this summer. Anyways, my mom's cousin has manifold gauges for r22/r12. They don't fit my fittings.
My fittings have the needle maybe 1/4" down in the fitting body? So when you are looking at the fitting, the needle piece is 1/4" below the surface? I am speaking in idiot terms, I know, so please be gentle. Do these seem like r-134 fittings? The threads are in the inside of the fitting if that helps any.
Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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The fittings you discribed are R134. The R12 have the threads on the outside and the valve stem in the middle is right at the top. The gages will need adapters or R134 hoses to check the system pressure.

Where could I get r-134a adapters?
Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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One source is www.ackits.com

A professional conversion would have stickers to indicate.

r134a fittings resemble a the quick-disconnect fittings used for air compressors, though shorter. r12 fittings are threaded on the outside.

Frequently, the r12 -> r134a conversion fitting are screwed right onto the old r12 fittings. Perhaps they are still under there.

BTW, it is better to use a separate gauge set for each to avoid cross-contamination. Also, this is the legal way to do it. r134a sets are required to have 'closed' hose fittings that keep the gas in the hoses even when they are disconnected.

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1986 300E 5-Speed 240k mi.

Well, we did it today. We put about 3 cans in and it's blowing as cold as it's going to. I bought a hose set from NAPA. All it was was a tap to go on the can and then the connection for r-134a on the other end. We cut that in half and bought 2 barbed connections and a copper "T". We then just used one gauge form his manifold set and screwed it into the "T". Let me know if you guys want more detailed instructions, but anyways, it's done. At about 2500rpm's, the low pressure is pretty steady at 25-26, which ios where it should be from the conversion chart of freezing, etc. My mom's cousin helped and he worked at a hospital and often did refrigeration stuff there. I don't think my car will be doing very well though sitting at a light when it's 85 outside though.
Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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