A/C gets colder as i drive but at idle it stops blowing cold like it should

2003 TOYOTA HIGHLANDER
170,000 MILES • 4 CYL • 2WD • AUTOMATIC
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TOYPACIFIC
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I know i was here recently about finding the evaporator and expansion valve, but i have this question that might help me understand whats going on. so i changed out the condenser and A/C compressor both new .
i filled up the Freon with one of those gauges i bought from Napa. i got it filled up but not to high just to where my gauge reads full. anyways A/C compressor goes on, cooling fan is spinning and A/C is cold. although it's not as cold as it should be and it does get cold like it should when driving, but as i'm idling it will get a little warmer. now just to be clear this was the reason why i changed out those components with newer ones. A/C had just the right amount of oil. so i'm stuck here thinking maybe i still need to change out the expansion valve and evap.. any suggestions as to why this problem might still be happening?
Sep 19, 2020 at 2:40 AM
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ASEMASTER6371
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Good morning,

What is the pressure at idle with the A/C on?

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

You cannot tell Freon level by gauge readings at all.

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

You really should have a set of gauges so you can read the high and low side pressures.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

The correct way of filling the system is to evacuate the system for about an hour and then fill with the exact amount of Freon .

I need to see both readings so I can determine if you need the expansion valve.

Roy
Sep 19, 2020 at 4:18 AM
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TOYPACIFIC
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okay, good idea. I will probably take it into a shop have them evacuate and refill to recommended levels.
Sep 19, 2020 at 4:59 AM
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ASEMASTER6371
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Keep us updated.

Roy
Sep 19, 2020 at 5:05 AM