A/C Trouble

[morgan]

Hello Eirc have a 1986 Dodge Ram D150 and the a/c is r12 and I’m trying to recharge the freon and I put new hoses and a rebuilt Compressor. And now the A/C will run and then turn off then do it all over. It has freon in the System.

Thanks Morgan

Topic

[Billy]

Are you saying that the compressor cycles on and off? Cause it’s supposed to do that.

[morgan]

Yes but it’s not blowing any cold air it’s just hot air out of the vents I have put a 2 cans of freon in the system.

[Billy]

Charging the system properly and verifying proper function requires a gauge manifold. You can probably borrow one from your local auto parts store.

[Daniel]

It requires more than that. If you don’t have what I call a triple R machine (recover, recycle, recharge) then you have to do it all manually with the proper tools. You need:

Digital or proper scale analog gauges with low loss or core depressor and ball valve ends. Proper scale means 120PSI before retard on the low side gauge and a temp scale for the refrigerant in question.

A charging scale to weigh in refrigerant.

A 2 stage vacuum pump with new vacuum pump oil. Not single stage or air operated.

A micron vacuum gauge.

A cylinder of dry inert gas like nitrogen for leak checking.

Thermometers for vent temp and also preferably some clamp on ones so you can verify proper subcooling or superheat when applicable.

If converting to 134a you need the biggest parallel flow condenser that you can fit in front of the radiator, and it needs proper airflow. Seal the gaps around the edges between the condenser and radiator and if you don’t have a fan shroud either try to install one or upgrade to electric fans with an alternator upgrade to match.

Sent from my LG-US996 using Tapatalk

[Billy]

You did evacuate before putting in refrigerant, right? And replace the oil you removed?

[Andrew Phillips]

Did you replace the expansion valve? I would certainly have done that with a vehicle of this age. A sticking expansion valve would cause the symptoms you indicate.

[Author]

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