Calibrate AC Manifold Gauges (Before You Use Them)

[@JulianMerghart]

I guess gauges can go out of whack a little bit after using them and of course they don't come with instructions so I kept looking at that screw and wondering what it did thanks very helpful

[@melrobinson6919]

I borrowed a set from AutoZone and finally figured out that they weren't calibrated after only seeing -20PSI after vacuuming my POS Aveo's HVAC system. They were around 10PSI off, high, so now I see -30PSI under vacuum... Perfect. Now, to see if the vacuum holds.

[@wondersteven]

I noticed that my gauges were way off. Tried to figure out why and then duh!! I had moved from 1200' above sea level to 5000'. Used your video to confirm how to adjust. Thanks.

[@aqrealestateking]

Thank you!! Sweet and simple

[@papimasfuerte4671]

I like to bring them up to 40psi so i spend less money on refrigerant

[@JacobTheGunNut]

Mine goes up no matter which way I turn the screw

[@dannyhefner]

thank you for this information! my gauge wouldnt move past 25m when trying to vacuum my ac system. noticed it wasnt on 0 when first connecting it up. this was the solution!

[@boloyung88]

Do I need to release all the presssure first

[@quivsterderilo1244]

Short but very informative

[@DavidLopez-po6pb]

Thanks

[@frugaldiy1]

You're welcome, David. ;)

[@ivanechevarria7430]

Thank you. I almost threw away a set a perfectly working gages.

[@frugaldiy1]

You're welcome. Soooo glad to hear you didn't toss the gauges. Good for you! ;)

[@duckhunter8387]

Just what I needed

[@jameswright4777]

thank you

[@frugaldiy1]

You're welcome, James. ;)