Air con manifold pressures

[pdhart]

Hi, I have an issue with the A/C on my 2012 E70.  Left side is blowing cold, right side is warmer but still a bit cold. I've seen a few videos about low A/C refrigerant causing that, as it prioritises the driver side (left in most of the world). I have a set of manifold gauges, but not totally sure what the low and high pressures should be on the X5. I'm guessing around 45 to 50 on low and around 150 on the high. Can anyone confirm 100% what is the correct pressure?

thanks Paul.

[Greydog]

Morning Paul

Your problem may not be AC related but climate control related 

First get the heater water valves checked if they are sticking then that could well be the issue I have changed water valves on an E53 and E71 for this problem. Hose clamps on the hoses unplug the valve disconnect the hoses stick a towel underneath to catch the spill. Fit the new valve re-connect and top up the header tank.

If it were me I would also book an AirCon service systems loose a small percentage each year KwikFit have some deals on at the moment and as it is carried out by an automated machine that Vacs out the system holds the Vacuum as a leak check and refills with the correct type and quantities of lubricant and refrigerant. 

And to answer your original question anything around or below 30psi on the low pressure side after about 15 to 20 mins running will give poor cooling it should around 45 to 50psi 

Dave

[pdhart]

Thanks Dave. Will investigate.

Paul.

[Backyard Bimmer]

Did you ever resolve this?  I have the same issue and am looking for pressure data.

[Greydog]

Morning Mike

Welcome to the Forum

The Post is 3 years old and I am not sure if the original poster even still has the car?

As said you can check pressure at the Low Pressure side after 15/20mins running anything below 30 psi points to low /no Gas. Most systems loose a little every year particularly if the system is shut down during the winter months as many folks do, the seals dry out and leaks start it's better to use the Climate Control and leave it running. 

If your topping it up yourself make sure the kit has the correct compressor oil as low compressor oil levels can give issues. 

If the water control valves are OK and working, the Climate Control unit is functioning correctly, then I would use someone like Kwik Fit to service the AC the systems they use are automatic and pre-programmed it will vac out the system, providing the system holds the vacuum for a measured time (no leaks) it will introduce the correct oil and re-gas the system. I expect to get mine done every 3 to 5 years depending on the car and AC performance 

Dave

Note your car should be Type R134A you can't mix gasses