1960 A/C refill port

[ricoman]

I have the r12 to refill a/c but cannot find the connection to the fill port. It is not the modern clip on it is a screw on 7/16 x 20 hose needed for connection. Cannot find anything to rig up so I can fill. Any ideas or does someone have an old school fill hose?..

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[goose18]

I have the r12 to refill a/c but cannot find the connection to the fill port. It is not the modern clip on it is a screw on 7/16 x 20 hose needed for connection. Cannot find anything to rig up so I can fill. Any ideas or does someone have an old school fill hose?..

 

[goose18]

That’s 1/4” male flare if you have gauges the hose should screw on to it. Then unscrew the black cap and turn the stem a quarter turn that opens the system to your gauges

 

[goose18]

That’s 1/4” male flare if you have gauges the hose should screw on to it. Then unscrew the black cap and turn the stem a quarter turn that opens the system to your gauges

Some auto supply stores will loan gauges. Make sure when you open the stem you bleed a small amount of Freon out to purge the air.

 

[ricoman]

Some auto supply stores will loan gauges. Make sure when you open the stem you bleed a small amount of Freon out to purge the air.

My system is completely empty, the ports under the black caps, should they be open or closed???

 

[doug7740]

The stem under the black cap should be turned a quarter turn to open the system to your gauges.

doug7740
1955 Thunderbird Blue

 

[goose18]

The stem under the black cap should be turned a quarter turn to open the system to your gauges.

doug7740
1955 Thunderbird Blue

To close the port turn the stem ccw while looking at the end of stem. If your system is flat you will want to add either nitrogen to try and find the leak using soap bubbles at all fittings or add some R-12 and then use a electronic leak detector. Don't use air to pressurize the system. After repairing the leak you should replace the receiver/dryer and use a vacuum pump to remove all noncondensibles before recharging. The low side port is the one that goes to the firewall and the highside port goes to the condenser next to the radiator.

 

[doug7740]

My system is completely empty, the ports under the black caps, should they be open or closed???

Are you sure the system is completely empty? If the stem type service valve is in the front seated or back seated position, the service port is closed and there will be no pressure readings on the gauge. The service valve must be set to the mid-position before you can get any pressure readings on the gauge.

doug7740
1955 Thunderbird Blue

 

[ricoman]

Are you sure the system is completely empty? If the stem type service valve is in the front seated or back seated position, the service port is closed and there will be no pressure readings on the gauge. The service valve must be set to the mid-position before you can get any pressure readings on the gauge.

doug7740
1955 Thunderbird Blue

View attachment 21659

To check that I understand, I need to screw in the valves to allow system to fill and then out once filled to allow free flow of Freon. And yes I am sue the system is completely empty, so am I reading your response correctly?

 

[jimntempe]

To check that I understand, I need to screw in the valves to allow system to fill and then out once filled to allow free flow of Freon. And yes I am sue the system is completely empty, so am I reading your response correctly?

Yes, screw in PARTIALLY. As the diagram of the valve shows, if you screw it in all the way you close off the other side of the valve. In that position on these old systems it allowed you to close both the high and low side off to the entire "plumbing" of the car and then you could remove the compressor by unbolting it from the valves and put a new compressor on without having to empty the freon out of the "plumbing". This multi-position multi-function aspect of these valves can make it confusing. Normal operation requires the valve to be completely "unscrewed" so it seats so as to close off the charging port. Service position with a gauge set installed is with the valve in "neutral", i.e. screwed in halfway. "remove compressor while system is still charged" is screwed in all the way.