Ac compressor issue keeps cycling?

2003 HUMMER H2
172,000 MILES • 4WD • AUTOMATIC
Avatar
BHAMDOC1
  • MEMBER
  • 280 POSTS
Found the ac belt broken and just sitting behind the harmonic balancer. Clutch moves by hand. Put a new belt and chefked the system. It keps cycling, these r new gauges so i cannot tell what is going on. This video shows it. Picture is after the car was off
Jul 10, 2026 at 10:37 PM
Advertisement
Avatar
STRAILER
  • ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Hello,

Is the high side connected? I would make sure the high side valve is connected to the system correctly so it reads pressure. If it is connected correctly try putting more refrigerant in to see if you can get a high side pressure response, please go over this video as well.

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

Thanks for the videos, they help. Please go over this video and get back to me.
Jul 11, 2026 at 3:00 PM
Avatar
BHAMDOC1
  • MEMBER
  • 280 POSTS
ya it is connected. This new ac can tap design is driving me crazy, I cannot tell whether it is letting freon out or not compared to the old ones that just pinch the can
Jul 11, 2026 at 3:15 PM
Avatar
BHAMDOC1
  • MEMBER
  • 280 POSTS
but I did not open the port from either side of high pressure I think
Jul 11, 2026 at 3:19 PM
Avatar
BHAMDOC1
  • MEMBER
  • 280 POSTS
This is with both open at the charging ports and both closed at the gauges
Jul 11, 2026 at 3:37 PM
Avatar
BHAMDOC1
  • MEMBER
  • 280 POSTS
Turned out maybe i was using the wrong tap. I connexted the normal hose that comes with a can and i was able to add but its at the limit between green abd yellow now. Ac is cold. Compressor making a noise so maybe bad
Jul 11, 2026 at 3:49 PM
Avatar
MECHTRIX
  • ASE Certified Mechanic
  • 393 POSTS
  • ASE Certified Mechanic
sounds like this might be the last resort...it might have been low on pag oil if it hasn't been long maybe ad some pag oil to see if it quiets down but if it doesn't then the damage has been done and you might need a new pump
Jul 11, 2026 at 10:18 PM
Avatar
MECHTRIX
  • ASE Certified Mechanic
  • 393 POSTS
  • ASE Certified Mechanic
sounds like this might be the last resort...it might have been low on pag oil [hence the noise] but if it hasn't been long maybe ad some pag oil to see if it quiets down but if it doesn't then the damage has been done and you might need a new pump ..but its worth trying because of the fact its still making pressure or it wouldn't be cold and it is' so it might not be to late to save it ..good luck
Jul 11, 2026 at 10:27 PM
Avatar
STRAILER
  • ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Great to see ya back on MECHTRIX!
Jul 12, 2026 at 10:13 PM
Avatar
MECHTRIX
  • ASE Certified Mechanic
  • 393 POSTS
  • ASE Certified Mechanic
thanks' great to be back.
Jul 13, 2026 at 9:38 AM
Avatar
MECHTRIX
  • ASE Certified Mechanic
  • 393 POSTS
  • ASE Certified Mechanic
Also it will cycle like that when you dont have enough refrigerant in the system so you might need more ... while adding it slowly you can hear a change the cycling it gets longer in between times clicking on and off but finally stops cycling when it nears max capacity also make sure youre using the correct refrigerant for the vehicle r1234? Or r134a? And another side note the cans come different ways some have pag oil in the can and some dont and the oils are also different for different types of gas so if you dont think it needs oil you can just buy the type without the pag oil in the can... hope this helps good luck '
Jul 18, 2026 at 12:10 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.