High and low side on Guages

Tiny
JENKBYMOM
  • MEMBER
  • 2003 HONDA CRV
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 188,800 MILES
No issue just like to know why never open the red high side on gauges all other you tube video show to use both high and low side, thank you jax fl
Sunday, March 29th, 2026 AT 10:13 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,291 POSTS
You can open the high side valve when vacuuming down the system only! Never open the red side when charging or the system is on, this can pump high pressure into the charge can/jug and make it explode. This is why we don't open the red valve. I never do, I just let is vacuum down through the low side. FYI.
Was this
answer
helpful?
Yes
No
Monday, March 30th, 2026 AT 7:54 AM

Please login or register to post a reply.

Related Instrument Cluster Content

VIEW MORE