How to service AC system using RobinAir 34788

[@ActiiVationz]

Damn the camera man is good! He should get a gold star or cookie.

[@anthonymartinka7712]

Very informative, Thanks

[@lucaswalker104]

I don’t understand why you Charge high side instead of low can you please explain this to me. This is the machine we use at work and I’m so frustrated with it I cannot take it anymore

[@paulkelley86]

You can change the fill to low side manually. Ultimately whether you charge low or high it is all going to the same place. The machine has the ability to "push" the refrigerant in vs. Old school charging with just a tank and gauges you would have to "draw" it out of the tank on the low side. You shouldn't be frustrated, it's a non issue. Change it to charge low if you want. :-)

[@PetePutros]

This is one of the easiest machines to use, if not THE easiest. If you want to charge on low side, when u enter your freon amount, hit the charge button and it will switch from high to low. Hit it again and it will switch to both.

[@PetePutros]

@@paulkelley86 btw, you do know that the compressor wasn't running at all when u were equalizing the hoses. Lol I'm sure you did, but u just finished ur demo.

[@paulkelley86]

@@PetePutros You are right! The truth is that these lab cars are used to remove and replace engines as well as various other jobs that require repeated AC recovery. In the interested of maximizing student lab time efficiency... we often keep them empty since we really want to focus on the specific task for that class rather than adding on AC evacuation and recharge time to every course (although it would be great practice) So when I grab a Lab car to do a demo on, sometimes I dont know the exact condition of the AC system since it is inop from bring empty. This one had a fault, so when it was all charged, the compressor did not run as a result. As you can see, the battery has seen better days as well. No one ever caught that the compressor did run based on gauge pressures before so congrats for being the first one! Ultimately I feel the video of how to still serves its purpose. We cover more about the compressor running, pressures, temperatures, etc later in system diagnosis so at this point, it is a practice "performance test" car that fails, and a good component R&R car that helps students practice using the machine :-) I believe the car had an open circuit to the pressure sensor or compressor solenoid that was to be used later in the course. :-)

[@slavikonufriychuk3485]

Anyone knows how to get in into service menu on robinair 34788?

[@lucaswalker104]

Why does mine say pressure too high to inject oil after I recovered the system

[@paulkelley86]

You need to vacuum it first then inject oil

[@lucaswalker104]

I have tried it both ways before Vacuum and After vacuum. it still says pressure too high to inject oil. Could it be something wrong with the machine

[@lucaswalker104]

Also I have confirmed that there’s no pressure in the system by opening the high and low side Schrader valve

[@paulkelley86]

@@lucaswalker104 The machine cant push oil, it can only allow it to be drawn in, which requires a vacuum. You need to have your system drawn into a vacuum or it will not work. It you cannot draw vacuum, maybe you have a leak or your vacuum pump is worn out.

[@pantera2137]

hi

[@kennygiang5136]

lol they didnt even know how to measure oil, and you guys are toyota techs? graduated 2.1 gpa, thanks for the info though.

[@paulkelley86]

They are students. They are in a community college class partnered with Toyota where they come to learn the skills necessary for the job. The purpose of the video (which was a recorded class demonstration) is to show them the machine for the very first time. The uniforms say nothing other than they have started their internship. Glad the video helped you though.

[@homecyber32283]

yes pushin bittons the anwer 🤣😂... probably could been wprd different or better ...👍👍

[@banzaibankai2671]

Before the last part where you guys disconnected the red high side and blue low side, you were supposed to start the vehicle and run the AC system with them connected but in the closed positions and look at the pressure readings. If the AC system worked correctly, you would have seen the blue low side drop down in pressure, meaning the compressor is kicking on and working and your red high side would go up in pressure, usually about twice ambient temps. Then you would open the low side while the AC is running to empty the lines so you can disconnect them from the vehicle. You skipped an important step in checking to see if the system was working as it should.

[@juanpaz6707]

Makes no sense. How would the machine read pressures with the valves closed and if you were to disconnect the hoses with valves open you’ll be letting the gas out.

[@paulkelley86]

Missed this, that instruction is to equalize the hoses. It is true we should have, but typically I like to just leave them both open and verify pressures with it running.