I'm having an issue with my A/C compressor cycling every 5 seconds or so when the A/C is set to LOW while idling and ECON OFF. It should remain on, correct? Here's a brief story of how I got to this situation:
My air conditioner was blowing hot air, so I decided to attempt a re-charge using R134A. Prior to the re-charge, the gauge reading on the low side was about 15 PSI. I don't think the compressor was turning on. Refrigerant was added to yield a pressure of about 35 PSI when the compressor was on (ambient temperature was about 75-80F). Air at about 40F blows out the vents at night when it is 75-80F outside, and about 50F when it is 90F outside.
So, here's the issue: When the hood is propped open, the A/C compressor doesn't cycle (again on the LOW setting, ECON OFF, car idling, fans at full blast). When the hood is closed, the A/C starts cycling every few seconds. When it is opened, it stops cycling and remains on after 30 seconds or so. I think that the additional heat is causing this when the hood is closed, but what can I do to fix it? Could the relay contacts be expanding and becoming unreliable, or do I need to do something else?
A second issue I noticed was while driving, I could feel the A/C cycling. There's a distinctive jerk when the clutch activates. I don't recall feeling this before. Is this normal?
Thanks for any guidance. Note that I'm fairly new to DIY auto repair, too, so don't assume much prior knowledge