I get this strange subtle but annoying air con humming noise especially when idle to accelerate, or low speed creeping...
any idea what and how to fix it?


Maybe because i have added freon, ac was empty completely, or added cleaning foam on evaporator?

 

https://youtube.com/shorts/CUrONl5r3ho?feature=share4

 

How to check and add ac nd11 oil
teach me, masters

 

r134a leaked out.
I want to add some more r134a.
should I add ND11 oil too, or all the oil stays in the compressor, and there is no need for it?
Why is ND11 SOOO expensive?

how much oil to add?
where to?
How do I find out how much oil is in the system?

 

if you are only topping up the unit you shouldn't need oil. usually when components are changed (i.e. condenser, compressor, drier, etc)

 

By topping up i meant completely empty and fully leaked r134a with zero psi left in the loop

 

No, only add AC oil if replacing components, done this multiple times, full vacuum, add R134a only. Each component has an oil amount to add if it is replaced.

 

If i vacuum AC then the low pressure valve would collapse and intake air from outside till it reaches 1 bar right?

I don't understand how to add r134a and a sealant.
If I do without vacuum the the pressure is already there and i cannot add

I just don't understand how to introduce gas into ac system


Is vacuum pump only used to suck out air and moisture?
Thus instead of air there is a r134a gas

 

What is the max good AC low pressure and high pressure psi at 30 degrees Celsius?

should i rev the engines or on idle enough?


rx400h 2008


​​​​​​I Should not care about grams and cans, look at high and low pressures psi right?

 

>>>>Best to take it to a shop & have it repaired correctly........

 

Best to hit up a a/c shop to get it handled correctly.......

 

A massively useless 'advice', why did you even bother typing?

Let's just close this forum and website and put a banner with "just go to a car shop" text