Air Conditioner Compressor concern

[JAdack]

My '66 Birds AC will blow really cold for about 45 seconds and then the compressor shuts down. It may take a minute or more for it to come back on. This repeats over and over so the car will not cool down. The system has been converted to 134A by the previous owner.
What might keep the compressor from constant running in this factory installed unit??

 

[HeadacheGuy]

Some conversions had a high pressure cut out switch installed as R134 tends to create higher high side pressure. See if it has one installed or not. If it does it may be overcharged or the airflow across the condenser is not good enough. Gauge readings will tell the story here.

 

[handana]

Ac repair

If you have problems with your 66, seek professional help. I have a 66 that has been converted and have no issues. I used a heating/cooling/radiator guy who was old enough to understand the complicated system in the car and knew what he had to do to update it. In the end it was cheaper than installing a new AC kit.

 

[rom324]

Make sure the min-max lever on the a/c panel is in the max position. Mine will keep cycling the compressor if it is at min. setting

 

[Terry64HT]

You usually have to replace the receiver/dryer when converting from R12. It's located under the rad cover. If it looks original, that may be your problem.
Terry
64HT

 

[amps1956]

could also be oil 134 uses synthetic and 12 uses mineral

 

[boogannex]

I have an ‘05 and tye ac comes on but only lasts about 20 min then turns hot and stays hot. Some times if the car cools down or i turn it off for an eztended period it will do it again but never turns cold unless i mess with it.

At one point tool to garage because it stayed hot all the time and they said they had to prop onenif the levers to the AC open because that was the issue (never understood why they didnt replace the lever/door but it did work several times before it happened again so not certain if the lever/ door is broken again . Had 3 people look at it and no one can figure it out simce not throwing “codes” and has freon.

Could this be same issue? (Not certain they ever changed the freon however. .
But i notice both sides of window do not defrost the same. Drivers side gets fogged up and doesnt clear but seems to blow some air while drivers side is clear as a bell