A/C charge pressure

3000GT MR · 06-23-2014, 10:50 AM

Could somebody with a good working A/C check the low pressure

-A/C max on
-fan 100%
-windows down
-idle for 5 minutes

Just let me know the ambeint temp.

I can only find how much in volume, not any pressures. If someone knows by all means tell.

Thank you

thomas88162 · 06-23-2014, 11:14 AM

With the compressor on, you typically want a PSI of ~40 although this value varies based on environmental conditions. There is a reason it is measured in volume, as that is the most accurate way to fill an AC system. If you add 134a and it doesn't fix your problem, it would be a good idea to let a qualified AC shop take over.

shadow191 · 06-23-2014, 11:21 AM

Last year after I fixed my system, I was at about 38 psi and 75F after recharging. That was AC at max for almost 10 minutes. Not sure what the range is, but I think if it's somewhere between 35-45 you're ok.

3000GT MR · 06-23-2014, 04:01 PM

I replaced my condenser and vacuumed it down to for a few hours then i put it the recommended volume. The low side ended up in the 80's causing my compressor to kick off. so i depleated it down to 60 and it works a lot better but in 100*F its still not 100%.

thomas88162 · 06-23-2014, 06:03 PM

Quote:

Originally Posted by 3000GT MR

I replaced my condenser and vacuumed it down to for a few hours then i put it the recommended volume. The low side ended up in the 80's causing my compressor to kick off. so i depleated it down to 60 and it works a lot better but in 100*F its still not 100%.

You might want to try a lower level, over pressurization is not good for your system.

talisman311 · 06-23-2014, 10:59 PM

Quote:

Originally Posted by 3000GT MR

I replaced my condenser and vacuumed it down to for a few hours then i put it the recommended volume. The low side ended up in the 80's causing my compressor to kick off. so i depleated it down to 60 and it works a lot better but in 100*F its still not 100%.

Whoa. 60 is still high for a working compressor. Id get a manifold set and check high pressure side as well.

Your compressor might be going into high pressure shutoff hence the worse performance while driving.

06-23-2014, 10:50 AM	#1
3000GT MR Major 265 Rep 1,392 Posts Drives: 09 335i/3000gt vr4 Join Date: Jun 2012 Location: Sav GA iTrader: (6)	A/C charge pressure Could somebody with a good working A/C check the low pressure -A/C max on -fan 100% -windows down -idle for 5 minutes Just let me know the ambeint temp. I can only find how much in volume, not any pressures. If someone knows by all means tell. Thank you __________________ Have a single turbo and/or tired of burning up O2 sensors? Ask me about the new ADV O2 sensor retro kits! 335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust 335i 2009 e90 665RWHP VFF900 ST RIP .
	Appreciate 0 Tweet Quote

06-23-2014, 11:14 AM	#2
thomas88162 Lieutenant 19 Rep 595 Posts Drives: E92 328i Join Date: Jun 2013 Location: Clinton, IN iTrader: (0)	With the compressor on, you typically want a PSI of ~40 although this value varies based on environmental conditions. There is a reason it is measured in volume, as that is the most accurate way to fill an AC system. If you add 134a and it doesn't fix your problem, it would be a good idea to let a qualified AC shop take over.
	Appreciate 0 Quote

06-23-2014, 11:21 AM	#3
shadow191 Lieutenant Colonel 181 Rep 1,681 Posts Drives: 2017 Volvo XC90 R-Design Join Date: Dec 2012 Location: GA iTrader: (3)	Last year after I fixed my system, I was at about 38 psi and 75F after recharging. That was AC at max for almost 10 minutes. Not sure what the range is, but I think if it's somewhere between 35-45 you're ok.
	Appreciate 0 Quote

06-23-2014, 04:01 PM	#4
3000GT MR Major 265 Rep 1,392 Posts Drives: 09 335i/3000gt vr4 Join Date: Jun 2012 Location: Sav GA iTrader: (6)	I replaced my condenser and vacuumed it down to for a few hours then i put it the recommended volume. The low side ended up in the 80's causing my compressor to kick off. so i depleated it down to 60 and it works a lot better but in 100F its still not 100%. __________________ Have a single turbo and/or tired of burning up O2 sensors? Ask me about the new ADV O2 sensor retro kits!* 335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust 335i 2009 e90 665RWHP VFF900 ST RIP .
	Appreciate 0 Quote