Cheers,

My car AC has a leak and until I fix it I have o refill few times a year.

What is funny is that the only real way to know how much gas there is in the system, is to empty it (flush), and then put the amount required.

When they just refill I wonder how they know what is the total gas in the system.

For example my car should have 630g, but what they see when they refill is only low and high pressure, not the total gas in the car. Please check the pictures before and after refill, do you think that they refilled enough ? Or it's clearly impossible to know ?

And what if they put too much ?

 

I am wondering if any place is actually able to totally empty/flush the gas and refill it with required amount ?

But how can they know that they inject 630g even when they gauge does not show any quantity ?

Please tell me what I do not understand ?

 

Greetings !

 

I found this:

https://www.rechargeac.com/how-to/ac-system-pressure-chart

 

R-134a TEMPERATURE PRESSURE CHART (Tabla de Temperaturas y Lecturas)
Ambient temp is the outside atmospheric temperature.
Ambient Temperature °F / °C (Temperatura Ambiental)	Low-Pressure Gauge (Puerto de Servicio del Lado de Baja Presion)	High-Pressure Gauge (Puerto de Servicio del Lado de Lado de Alta Presion)
65°F (18°C)	25-35 psi / 172-241 kPa	135-155 psi / 931-1069 kPa
70°F (21°C)	35-40 psi / 241-276 kPa	145-160 psi / 1000-1103 kPa
75°F (24°C)	35-40 psi / 241-310 kPa	150-170 psi / 1034-1172 kPa
80°F (27°C)	40-50 psi / 276-345 kPa	175-210 psi / 1207-1448 kPa
85°F (29°C)	45-55 psi / 310-379 kPa	225-250 psi / 1551-1724 kPa
90°F (32°C)	45-55 psi / 310-379 kPa	250-270 psi / 1724-1862 kPa
95°F (35°C)	50-55 psi / 345-379 kPa	275-300 psi / 1896-2068 kPa
100°F (38°C)	50-55 psi / 345-379 kPa	315-325 psi / 2172-2241 kPa
105°F (41°C)	50-55 psi / 345-379 kPa	330-335 psi / 2275-2310 kPa
110°F (43°C)	50-55 psi / 345-379 kPa	340-345 psi / 2344-2379 kPa

INTERPRETING PRESSURE READINGS
Low-Pressure Gauge	High-Pressure Gauge	Action Required
IN RANGE	IN RANGE	A/C is working properly.
LOW	LOW	Add Refrigerant.
LOW	HIGH	Need service, possible blockage of the expansion valve or orifice tube.
HIGH	LOW	Needs service, possibly faulty compressor.
HIGH	HIGH	System is overcharged. Slowly remove refrigerant. Venting is illegal in USA.

 

Edited April 1, 20215 yr by sncoem

If the pressure reading are correct, you have the right amount of refrigerant. If both pressures are high, it's overcharged. If both sides are low, it's undercharged. If the low is high and the high is low you have a problem in your system. 

 

The technician has no incentive to not fill the system completely, as they charge you for the refrigerant and mart it up accordingly.

 

If you are adding refrigerant a few time a year the system is leaking and you should get it fixed.  

Find the leak, repair the leak, refill with required amount of refridgerant

 

36 minutes ago, Yellowtail said:

If you are adding refrigerant a few time a year the system is leaking and you should get it fixed.

 

 From the OP:     My car AC has a leak and until I fix it I have o refill few times a year.

 

My suggestion would be to just go ahead and get the Aircon fixed.      Thailand is pretty  darn hot and there's a reason it's uncommon to see a car driving down the street with windows open.

 

Automobile  repairs are relatively or comparatively inexpensive here and  instead of letting a polluting gas escape go the atmosphere knowingly  why not deal with the source of the leak?

 

 

 

You already posted this topic HERE

 

//CLOSED//