hornepirate

iTrader: (23)

My low side pressure is 35. Did a uv test and found no leaks. Ac blows at 78* when set to 65. Low side lines are warm.

Any ideas?

bullet187

You may have moisture in the system and need to evac/recharge.

hornepirate

iTrader: (23)

No, already did that but thanks

njmaxseltd

iTrader: (19)

Are you measuring static or compressor running pressures?

cashoit

jus had this issue...

Are you sure the compressor is turning on? How did u measure the pressure? Are the cooling fans turning on with the compressor? U sure u got proper charge?

If you answer is that all this stuff is good, then your expansion valve may be broken.

When was the last time the AC worked?

hornepirate

iTrader: (23)

Measured using guages and ac worked a week ago and was ice cold. Clutch is engaging so its not a compressor issue i narrowed to be the txp valve or the evap core

Im gonna tear it down tomorrow when i do my wheel bearing

hornepirate

iTrader: (23)

Fans are turning on as well. Which leaves the txp and evap core

hornepirate

iTrader: (23)

I Evac'd the system and changed the TXP. It was in rough shape, looked to be leaking oil. When i went to recharge the system, it did not take but a few onces but the low side pressure numbers were correct. A/C high full cold no recirc. i tried it with recirc and same low side readings

maybe i have air in the lines?

Did i not do something right? (technically)

cashoit

How did u evac the system? Did u have a shop do it?

If you evac the system and are doing full charge, it should take about a small can and a half. (Dont use the expensive AC-COLD synethtic big can refirgerant, it didnt work for me)

U have air in the line. you can verify by bleeding the high side. If u have only refrigerant in the lines, when u bleed on the high side, u will only get white plume refrigerant.

Add refrigerant until u get proper charge or the compressor is running. This should take about a can. Or just add an entire can, wont hurt. Bleed air outta the lines using the high side port until the compressor kicks off. Add refrigerant until proper charge. Bleed again. Continue this process until only white plume refrigerant comes out. this is what i did to remove air. You might have to bleed twice. Two cans should work. Three if u got the cash and wanna top it off.

If you only have refrigerant in the lines and still no AC maybe the evap core is blocked or something

hornepirate

iTrader: (23)

I just did this until i got the white plume and could smell refrigerant and AC still did not get cold and only took maybe 8 oz. until it was full post bleeding. I did this with two cans, possible that I still have air in the lines?

njmaxseltd

iTrader: (19)

You can't bleed the refrigerant system, it needs to be evacuated and charged, by weight while the system is under a vacuum state.

I think your not reading the pressures correctly. The compressor will not run until you have over 30 psi static pressure. Even then it will cycle quickly. The readings you want are while the compressor is running. It will take much more the a few oz to bring the system pressures up.

hornepirate

iTrader: (23)

I understand that the system needs to be running and the compressor is running when taking readings from the low side. I am buying a vacuum pump and renting the manifold gages to get the system under a vacuum of 27 hg

It's odd becuase I've had systems evacd in other cars and not needed to vacuum them once the system had been open and I know the Maxima takes 1.7 lbs of r134

I'll report back once the systems been evacuated and vacuumed