A/C works intermittently

CAWLADY1

MEMBER
2001 SATURN SL2
1.9L
4 CYL
2WD
AUTOMATIC
220,443 MILES

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?

5 Replies

ASEMASTER6371

MECHANIC
52,797 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

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Sunday, May 20th, 2018 AT 2:16 PM

CAWLADY1

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14 POSTS

My nephew checked and said pressure was good.

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Sunday, May 20th, 2018 AT 4:26 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

I need the numbers.

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

Roy

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Sunday, May 20th, 2018 AT 4:27 PM

CAWLADY1

MEMBER
14 POSTS

Hi, I am not sure. My nephew is out of town. How do I go about checking the pressure?

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Thursday, May 24th, 2018 AT 8:21 AM

ASEMASTER6371

MECHANIC
52,797 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