is this a safe pressure for the ac?

hanzbe420 · Post by **hanzbe420** » 02 Jun 2012, 22:50

i filled the ac up with some r22. My pops had a whole tank laying in the garage. so i put the gauge on and i filled it to about 45-50 witch was the end of the green area on the gauge. so there's about 45-50 psi. is this safe or should i let some out immediately tomorrow or next week when i go back to my pops or will it be OK pressure wise? but i got it working blowing cold as ice, but the compressor sounded like it was under allot of load so was just wondering if the pressure is to high.

Post by **jblackburn** » 02 Jun 2012, 23:50

Proper pressure in the system really depends on the outside (ambient) temperature.

R-22 should NOT be used in a R-134a system. It may damage the compressor.

R-22 is a high pressure refrigerant; R-134a is a low pressure refrigerant.

Post by **jblackburn** » 02 Jun 2012, 23:55

http://www.refrigeration-engineer.com/f ... 22281.html

Post by **erikv11** » 03 Jun 2012, 00:24

I have read that R-22 will damage the o-rings, rubber lines and the desiccant of an R-134a system.

hanzbe420 · Post by **hanzbe420** » 03 Jun 2012, 00:56

so should i drain it first thing in the morning? and will it damage anything from it being in there over night? will the mineral oil mix with the pag oil and create sludge? or will i be fine if i just let it all out and refill with a artic freeze can with oil and sealers and gauge?

Post by **MoVolvos** » 03 Jun 2012, 01:18

hanzbe420 wrote:so should i drain it first thing in the morning? and will it damage anything from it being in there over night? will the mineral oil mix with the pag oil and create sludge? or will i be fine if i just let it all out and refill with a artic freeze can with oil and sealers and gauge?

A flush is in order and replace the filter/dryer (EDIT: desiccant per Erikv11). Your accumulator should be fine as well as your other parts as you have no metal contaminants but just mixed oil and refrigerant.

Blessings,
BKM
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hanzbe420 · Post by **hanzbe420** » 03 Jun 2012, 06:19

all i did was fill a ac that was pretty much empty after prolly a few yrs of non use. wheres the filter located.

hanzbe420 · Post by **hanzbe420** » 03 Jun 2012, 07:27

OK so this is what i did. i drained as much of the r2 out as possible, went to Walmart and got a can of ez chill 18oz with oil and sealers. now i notice the only way it will cycle on is if i jumper the low pressure switch. and then the coolant gets in there and it stays on when i replace the switch, otherwise if i don't jump it no matter how much coolant goes in there it goes on and off on and off. it was like 61 degrees F. and i added the whole can witch was about 25 psi. And the temperature chart said for 65 to put 25-35 in so after putting the whole can in, the compressor was staying on and cold air starting blowing. now when i hit the gas with the pressure gauge still hooked up the pressure actually goes up and shuts of the compressor. now when i was adding the r22 yesterday when i hit the throttle the pressure lowered. what do you guys think i am a little short on coolent? 25 is the lowest range in the full section its 25-35 when its filled. i haven't took it for a ride yet to see if the compressor stays on while driving. I put 18 oz can in there do you guys think i will need more or what? In the Manuel it says the system holds 1.65 pounds witch if i am correct is 26.4 oz and the can says it contains 15 oz r134a, 3 oz system safe leak sealer,lubricant, ac performance booster and ac system cleaner. what would cause the pressure to go up when i hit the gas(not floor it) All i did was tap the throttle under the hood and it shuts of the compressor? And then when it returns to idle it comes back on and stays on blowing cold air. And yesterday when i had the r22 it ran perfect no shut offs or pressure builds. i think its because i had about 45 psi. so i think i will put it to about 35 psi and then see what happens. but lemme no if u guys no anything thanks.

Post by **jblackburn** » 03 Jun 2012, 08:16

25 is the bare minimum for the compressor and it will cycle off if it goes below that. The system must be filled with idle held steady around 1500 RPM to simulate full load on the compressor. Hold open the throttle wheel with your right hand and add more refrigerant until it stops cycling.

Try between 28-30 psi.

hanzbe420 · Post by **hanzbe420** » 03 Jun 2012, 08:28

it just sucks cause now i gotta buy another whole can. i should of got the 20 ounce can! OK yea that defiantly sounds like the problem. so ill have my girl hold the throttle at 1500 while i add more till it stays on. 25 psi is all these 18 oz cans give you. Cause it only contains about 15 oz of coolant. But the system says it hold 1.65 pounds (26.4 oz) in the manual so i dunno lol. but thanks man i will do that. And how come i had to jumper'd the switch for it to stay running. like i said before when the switch was on and was empty i put most of the bottle in and it was still cycling on and off so i jumper'd the switch, it stayed running, and i added the rest of the can. Replaced the pressure switch and clutch continued to stay on and the air was nice and cold. I always thought that after u add like half it should just kick in and stay on why did i have to jumper it to make it take in the coolant?