A/C works intermittently

2001 SATURN SL2
220,443 MILES • 1.9L • 4 CYL • 2WD • AUTOMATIC
Avatar
CAWLADY1
  • MEMBER
  • 14 POSTS
My AC works intermittently. It charged and will produce cold air when idling but when I start driving, the engine surges and it feels like the compressor it disengaging. I can also hear a knocking sound when that happens. Is it the pressure switch, console button or compressor?
May 20, 2018 at 9:10 AM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good afternoon.

Do you have a set of gauges to check the pressures when running?

Hard to say without knowing specifics of the pressures. The system could be overcharged.

Roy

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak
May 20, 2018 at 2:16 PM
Avatar
CAWLADY1
  • MEMBER
  • 14 POSTS
My nephew checked and said pressure was good.
May 20, 2018 at 4:26 PM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
I need the numbers.

What is the high and low side readings while the A/C is on?

Roy
May 20, 2018 at 4:27 PM
Avatar
CAWLADY1
  • MEMBER
  • 14 POSTS
Hi, I am not sure. My nephew is out of town. How do I go about checking the pressure?
May 24, 2018 at 8:21 AM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
You need a set of gauges. You can rent them at a parts store and then hook them up to the ports on the AC lines and start the car and turn on the AC.

Roy

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system
May 24, 2018 at 12:20 PM