Hello, I am new to the forum and have been researching a problem on internet sites for a few days and have multiple answers. I am trying to narrow down some of the items hopefully by providing as much info as I can.

The problem I am having is my AC unit will only cool after it's been off (not cycled) for about 10 hours or so. If I switch the thermostat to cool it will cool as expected for the first cycle, but when it shuts off because it reached the set temp it will no longer cool after that until I leave it off as mentioned above. The unit will cycle back on and the compressor seems to start without any odd noises, but the refrigerant lines stay pretty close to air temp (the low pressure line gets slightly cool, but not cold as it normally would the high pressure line is cool to the touch). I have had a tech out to look at it, but all he wanted to do was to clean the evaporator coil and condenser coils, I was fine with that, but then he wanted to cut out my aquecoil heating coil and clean it even though you could see through it, because he said it was restricting air flow (he was measuring airflow at a vent that I later found out was blocked due to a cable being pulled tight over it in the attic. I felt that this person was only trying to build up hours to bill me for so I told him I wouldn't pay for his time to remove the aquecoil if it didn't fix the problem. He howed up at my house, hooked up his guages to the Condenser and said the pressur is equal on both sides you need a new compressor and someone from the office will call you with a quote.

I have a new guy coming out today who I told all this too and he thinks it's just a stuck valve and that the compressor is fine.

Anyone here have any ideas?

The unit is a Carrier model# 38ckc042340, serial# 3502e03162, prod#38ckc042---341--

I had another tech come out and we found that there was a restriction in the Dryer and that the condenser coils were clogged. The high side pressure was 325lbs when he started troubleshooting. After a good cleaning the pressure dropped to about 225 and the system ran good for about 3 days. Now I have to leave it off for about 4-6 hours once it stops cooling and then it will work fine again. The tech said he believes the compressor is damaged due to running at such high pressure for so long.

In any case I am getting a whole new system tomorrow hopefully.

It's an R22 system, he did replace the liquid line dryer (the old one was icing up on the exit end). He did put the system under vacuum and then charge it as well. He did not do an Ohm test on the compressor. The compressor kicks on and pulls 14 amps, but it does not pressurize the line.

Yes I have replaced the air filter, usually do that every month or so.