This is a beginners tutorial on how your automotive (134a) air conditioning system works. Hopefully this gives beginners and diy owners an idea of how their system works and how to diagnose certain problems.

AC gauge set and pump kit:

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  1. Manuel Martinez

    So I recharged my A/C and everything worked fine and was blowing cold air with no issues. Left out of town for 2 months and came back to my car not blowing Cold air. I tried recharging it with more A/C but it showed me it had already A/C recharge fluid already and didnt need any but its blowing hot air. Anyone know what is causing it?

  2. dont worry about it

    Damn man. What a wealth of knowledge. I'm currently trying to get my wife's car ice cold. This helps a lot.

  3. Red Bu11

    Your voice is incredibly familiar. Do you have a secondary Channel? 😁

  4. Anthony Skallet

    Not sure if this is a question you'd be able to answer with the limited info I have, but I have a question regarding possible short cycling. Just bought a 2018 Mazda3 and have noticed the compressor is kicking on for about 8 seconds then off for ~15 seconds over and over basically on repeat. This is with the A/C set to 69 degrees, low fan speed and recirculation on. The A/C works great, always blows cold, no issues I've noticed anyway. All over the internet I've read that it's both totally normal, while others say it's short cycling. Would this typically be considered abnormal cycling?

  5. Baja Joe

    I wish manufacturers would tell customers that ac systems need to be serviced every two years.

    Meaning recharged….suck and filled.

    I tell my customers that ac systems can naturally leak 1-5% of they’re charge every year. And a biannual recharge is the best way to spot leaks

  6. Christian Daniel

    What about when low pressure is normal and high pressure is low?

  7. 35jays

    Thanks for the very informative video. I have not looked yet, do you have a video on checks for the compressor not starting, beside a fuse check?
    Thanks!

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