Air condition low and high side PSI?

Tiny
JOE1953
  • MEMBER
  • 2008 JEEP GRAND CHEROKEE LAREDO
  • V6
  • 4WD
  • AUTOMATIC
  • 259,000 MILES
The A/C wasn't blowing cold air. I checked the low side it was 15 PSI, so I put 12oz of freon in it, it went up to 45 PSI, is that a good number? I didn't check the high side what the PSI should be on the high side? The temperature is 35 °F at the left vent.
Tuesday, June 24th, 2025 AT 12:58 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
The system was low that is for sure, the high side should be about 225 in about 75 degree weather. I the system seems cold there is a chance it is overcharged or under charged. Here is a video guide to help you:

https://www.youtube.com/watch?v=4EqdrBVb0sY

Let us know if you need anything else.
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Wednesday, June 25th, 2025 AT 11:20 AM
Tiny
JOE1953
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I vaccum the system for about 30 minutes and close the vaccum gague and pump and the gauge hold steady at 30 do that mean there is no leak in the system?
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Wednesday, August 13th, 2025 AT 10:08 PM
Tiny
KEN L
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Yes, this means the system is holding and ready to recharge. Let me know how it goes.
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Thursday, August 14th, 2025 AT 8:13 AM
Tiny
JOE1953
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What's the low and high side pressure should be?
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Thursday, August 14th, 2025 AT 11:33 AM
Tiny
KEN L
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If you watch that video it shows the high and low side pressures. Depending on temperature the high side should be about 240 and the low should be about 40 in about 70 degree weather. I would stop once the the starts to get cold.
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Friday, August 15th, 2025 AT 11:29 AM

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