Ac advice needed

[pass1over]

Just replaced all AC components but evaporator. Flushed lines and core, blew tons on shit through it and let it sit for a few days, etc. Vacuumed it down for almost 2 hours after pressure testing system overnight.
Freon charge says 21oz. I used most of 2 cans to refill (some accidentally escaped but I don't know how much). Which would be 24oz max. It's cold, not I think it should be colder.


Today was 85°, 55% humidity when testing.
At idle gauges are 30 low 175 high. temp from center vent was mid 58°
At 1500 rpm, gauges were 25/195. Temp from center vent was 48°
From my limited knowledge of reading I've done, sounds like it needs a little more freon?
Isn't pressures supposed to be 45-55 low and 225-250 high?

 

[86GT351]

You are correct. It needs a little more freon. Getting a specific charge off the small cans is very hard because it is hard to measure what is coming out of them.

 

[Juice]

Yes, the high side is a bit low. But as you add more refrigerant, the low side will start climbing. And vent temp rising, indicating full or slightly over charged.

 

[86GT351]

Even using an AC scale makes it very hard with the small cans

 

[pass1over]

Even using an AC scale makes it very hard with the small cans

I tried using a scale to measure the second can when I put it in, but it was not working like I saw in the demonstration video.

I think I'm going to get another small can and slowly add more Freon, see if I can get the pressures to climb a little. Thank you for confirming

 

[Juice]

My method/hack for filling a system.
After vacuum, start adding refrigerant.
Start engine, AC on fresh air, fan on high.
I grab the low side at the evaporator. Once it feels cold, I call it done. The compressor will also stop cycling fast and stay engaged longer as you reach "full-charge". More refrigerant will only reduce cooling.

 

[pass1over]

My method/hack for filling a system.
After vacuum, start adding refrigerant.
Start engine, AC on fresh air, fan on high.
I grab the low side at the evaporator. Once it feels cold, I call it done. The compressor will also stop cycling fast and stay engaged longer as you reach "full-charge". More refrigerant will only reduce cooling.

I basically did something similar. I vacuumed it down, let it sit overnight, system held perfect. Vacuumed it down for almost 2 hours. Attached 1st can and let it flow into system with engine off. Something came up and I didn't get back to it until the next day. Everything stayed attached overnight. The next day, I started engine and added 2nd can watching my gauges, but it never got to the pressures that are recommended on charts that I found.

Charging was done, max AC, max fan, windows down and driver door open. I tested it both with recirculate on and off, and idle and 1500rpm but again, pressures never got to where the chart specified.

Like I said, it's cold, but not as cold as I think it should be.

 

[86GT351]

I tried using a scale to measure the second can when I put it in, but it was not working like I saw in the demonstration video.

I think I'm going to get another small can and slowly add more Freon, see if I can get the pressures to climb a little. Thank you for confirming

That's the best you can do at this point