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Just wanted to say thank you to everybody who helped me fix my A/C. It wasn't cool at all, low side was about 25psi, compressor was cycling normally. I charged with 1 can (low side 45psi), and nice and cold again for another month.
Started loosing it's cool, I went for a 2-part leak sealer, which pumped the low port to 55psi. It was cool, but not cold enuf. When 90deg ambient, it went down to 70deg.
Went to my mechanic, he recovered some refridgerant down to 35psi, and the high was just short of minimum (Forgot actual number). Warm air blew... Threw some water over the thing in front of the radiator, and no change.
Took out the expansion valve, wasn't clogged, but cleaned it, recharged, still no cool air. Low was 35psi, high was lower than spec. Replaced compressor with a refurb 1yr warranty, changed drier, vacuum, no leaks in system, recharge.
Everything within spec. 87deg ambient, 43deg from center vents. Sweet!
Ive been having an A/C problem as well that was just fixed the other day. Charged it, leaked out, fixed all the O-Rings, charged it again with two cans after evacuating, still not 100% cold. Finally went to a local place that evacuated the system and measured the amount of freon back into the system. Did that, and its awsome now
The bottom line is, you need to get just the right amount of R134 into the system.
The other day it was 90 degrees out and it was was blowing 39 degree air from the fans.
One question for you. How long does it take to get cold air up ?? I start driving on a hot day and it does take a little bit of time. I would LOVE instant cold air, but really how long should it take.
Correction it's not "freon". Freon is only the R12 which is for older vehicles. Our cars use the new stuff called R134a that does not harm the Ozone layer. But good job on the A/C compressor replacement. Mine went bad about 2 years ago. Measured the air coming from the center vents with an IR pyrometer and it read 58 degrees. Just the other day. A/C problems will sometimes leave you scratching your head.
about how much does it run for a shop to evacuate the system and recharge it? i'd like for my a/c to blow a little colder...or should i just follow the saying "if it aint broke dont fix it"?
Definetly go to a correct shop and have it done. They put it on vaccum for a few hours and make sure its all out and holds vaccum. If something is wrong with the system, leak or compressor shot, they will troubleshoot as well.
I am not sure what a vane is. The CWV618 in our A32 has 6 cylinders. This compressor has variable capacity working off the high side and low side pressure. When the pressure delta (difference) is large, it increases capacity. So when you have the fan on high and the evaporator dumps a bunch of heat into the Freon, it create a high pressure delta and in turn the compressor works harder. When the interior temp goes down, the evaporator absorbs less heat the pressure delta ease then the compressor also decrease capacity.
Really an ingenious design. It is also what I would call a self destructive design. Few engineers will do this kinds of design but this guy at Calsonic must be a thermal genius. The only thing protecting the compressor is the triple pressure switch on top of the dryer. When the high side pressure exceed around 300PSI, it cuts out the clutch. This happened to me when I over filled the system with freon.
About 15 years ago, GM/Delco/Harrison licensed this design from Calsonic.
yeah hey just to add to this I thought the ac was sucking in my car too. So I check it the other day and it would only get 63 at the center vents. I noticed some oil in the lines and the low side would stay at 55. I change the expansion valve and now the low side goes to 45to 50. The center vent gets to about 49-50 with it about 80 outside. what eles may I check to try to get this thing good and cold?
About 1hr 45min of time. Gotta get the glovebox out. Then you'll see a big ol box. It's in that box. There's a writeup in another recent AC thread. Search "expansion valve"
Jae
if i recall correclty one of the guys change the valve by 'cutting open' the 'big ol box' you are refferring too. Is that correct? But i m worried that cutting open the box isnt the right way to do it, so is there another way to get access to the expansion valve?
Correction it's not "freon". Freon is only the R12 which is for older vehicles. Our cars use the new stuff called R134a that does not harm the Ozone layer. But good job on the A/C compressor replacement. Mine went bad about 2 years ago. Measured the air coming from the center vents with an IR pyrometer and it read 58 degrees. Just the other day. A/C problems will sometimes leave you scratching your head.
I’m sorry I just have to revive this thread to set everyone straight. “Freon” is only the manufacture of different refrigerants. They make R-134a they make R-22 etc. that’s like calling every suv a Jeep which is what some people do. Lol had nothing do so replied hahaha enjoy. If your systems needs refrigerant, in the auto industry they mostly use R134a not “Freon” which could be any type of refrigerant.
all jokes aside my compressor went out and just doing some research. I wasn’t trying to be a *****
Yup but As mentioned, there’s different manufactures.. coming from an HVAC background, it just annoys me when people think they know what they’re talking about.
I feel ya. I'm HVAC too. Hearing people say "Freon" is probably more annoying to me than getting a flat tire. I wanna slap anyone who says it. But I'm weird like that.
Low was 35psi, high was lower than spec. Replaced compressor with a refurb 1yr warranty, changed drier, vacuum, no leaks in system, recharge. 
