I was helping a friend yesterday with their E53 X5's AC system when I noticed this strange behavior:
- Before turning the AC on for the first time both high-side and low-side pressures read the same
- After turning the AC on the high-side pressure reading went higher and low-side went lower (as expected)
- After adding some refrigerant via the low-side charging port and turning the AC off the high-side and low-side pressures did not equalize immediately as I have seen it do on other vehicles. After 2-3 minutes there was still a healthy 60 psi difference in the two readings
Is this behavior indicative of something? A clogged expansion valve, perhaps?
