I did a retrofit and the car held vacuum for over 30 mins. put in pag and 134 to spec and once a month it gets low where the compressor cut on and off. I dont see any leaks under the hood-figured i'd see oil at the fittings but didnt. when I completely filled up system manifold read 60+ low 200+ high. how can i stop the leak. I dont want my compressor to prematurely burn up.


another thing it'll do is hessitate to come on when its full sometimes. or if coming to a sudden stop it'll cut off. does the computer have any effect on controling a/c? what regulates it?

 

Sounds like your compressor is going BYE BYE..but 60+ is way to high for a 1.5 pound system.

U should read 40-45 MAX on the low side !!!

So u blew something i bet !

 

i dont think anything is blown..If i went now and bout 134a it would be fine for the time being.
my system is to be 90% of the 3.2 lbs is calls for of R-12.

that number was wrong on the hotest days highest humidity in indy and in daytona beach it was around 50 psi low side. and the evavporator drain tube was pouring water

 

still never worked this out. the whole winter nnot enough 134 to energize compressor and now that weather has got warmer its working again. have checked the charge but i think it'll be too cool to gauge. purchased whole oring set with a few gaskets but I doint think its every been fully up to charge. my system is bigger guy due to the fact its in a L03 caprice. would like to get this sorted out before it gets hot. 65* high today and A/C worked fine for the 5 mins i had it on but at night it cycles on and off.

 

there is no sign of leakage. I have no odor of anything-idk if there is an refrigerent smell... i figure there would be oil at a joint but there is not. do those dye cans work?

 

if u converted it u needa change the presure switch, thats why ur presusre is so high

 

never seen anything about it, but there are to different parts on oreilley's website. whats this do? didnt see this in the TSB. have to read up again

 

so getting cool at night makes the pressure high?

 

I suspect your air conditioning is working as it should be.

Wintertime air temperature in Indy is how cold? 0°F? 30°? Negative temp?.....If the outside temp is below 40°F, the compressor generally won't turn on at all. The system spends it's entire time below the low pressure cut off point (around 25 psi).

As the seasons warm up and it gets to 65°, your system will cool nicely and cycle every so often. Maybe once a minute. Depends on traffic, how clean your condenser is. (Got any leaves in there?).....But at nighttime, the solar heat gain disappears and the system cycles way more often.

For a comparison, imagine putting your refrigerator outside. In 65° weather in the sun, it will cycle on and off about the same as it does in your kitchen. At night time with the sun down and the temps a little lower, it will run less often. In wintertime with near freezing or below freezing temps, it wouldn't run at all. In all these situations, it's not a matter of losing refrigerant. It's simply the temperature-pressure relationship.

 

well I got the o rings. will get the accumulator the week and orifice. doing a through cleaning the i did notice dirt/ grime build up at the connection where the orice is so thats probably the other leak. but im going to flush the condenser and the evaprator will still have to find the new high cut off switch.
I thought the clutch would cycle for the defrost in winter

 

Once the outdoor temps drop below 40°, your compressor won't turn on at all. The pressure will be below the cycle off point.

Even at 45°, the compressor will be off for the majority of the time, as the car will zoom down to the cycle off point quite quickly when it's that cold.

 

well got in town and bought new orifice and the r134 clutch cycle switch, no one had the accumulator in stock near my side of town. I put the switch on to see if system would work... it did ice cold. going to take note of pressures and post them but does anyone have a figure of what i should reading. temp is 65* 78% humidity

 

65° outside, I'd say around 35 psi low and around 210 psi high.

 

well 76 today with humidity 75% but I have a reading of 44psi low side; a lil over 200 psi high side. everything steady and forgot to get a vent reading but will do in a bit.

 

idk if the size difference of the a/c system make a difference at all; f-body is smaller than b-body

 

the vent temp was ~38* on highway and 45 at idle on max setting

 

For R-134a, those numbers are excellent.

 

found a chart for b-body lt1. bumped up to ~36 psi low; ~250high @ 2000rpm