My 2006 Honda Accord has an ongoing issue with the A/C - it is only blowing cool (65F) on passenger side, warm on driver side. This can be a symptom of low refrigerant because the refrigerant enters the evaporator on the passenger and is only able to cool that side.
I took it to a shop that evacuated and recharged the system and didn't find any leaks. Because of the temp difference they think it's just a blend door problem, even the passenger side is not very cold.
With rented gauges I did this test on a hotter day (88F and sunny):
1. Ambient pressure with A/C off: 105 psi on both sides.
2. Turning A/C on at idle: immediate drop to 65 High, 15 Low.
3. While at idle: High wobbled and climbed to 80, Low would climb to 24, then lower to 16, then back up again. ???
4. Increase to 2000rpm: High remained around 80, Low dropped to 11.
5. After a minute holding at 2000rpm: High 95, Low 14.
Why does the High side drop below ambient? And what could be the problem based on these readings?