Re: air conditioning 49 or 50 Packards

Posted by A man who owns one! On 2010/9/10 13:56:07

The cars that are on the road today {in the USA} have a compressor clutch that cycles on until the pressure switch is satisfied, then freewheels until needed again. Often in 20-60 sec intervals. One could almost compare it to an engine cooling system with respect to the thermostat. Because the cycle begins, then ends heat exchange occurs, liqued to gas and vise versa, then cycles again for more of the same.

I've never run across a compressor that stays on all of the time, but it would seem like an unneccesary load on the engine during winter months.

It has been my experience that when converting from r12 to 134a you simply intall the very low cost adapters, less than $10 us, vacuum the system and recharge with 134a. It has worked 100% of the time for me.

Best of Luck !