Air conditioner charging is a very common and necessary repair in almost all automotive in almost all parts of the world. Car air conditioner is breaking down regardless of the car make and model. Almost every car experiencing air conditioner failure several times in its service life. The air conditioner is the unit in a car which is eating up a lot of money from a car owner. Never ever original air condition is lasting for the life time of a car. You will need a set of manifold gauges to check you Freon pressure.
Here are some general guideline for A/C system pressures and temperatures based on ambient outside temperature. Remember that these are a guideline and your actual temperatures and pressures will vary depending on humidity in the air and the condition of your system. When running the car at idle to check the freon level it is a good idea to have a water hose handy and spray water on the a/c condencer. The condencer is located in front of the radiator.
For vehicles currently running with freon R-134a only
You can also use this good rule of thumb with R134a, run fan on High with all windows open and engine at 1500 rpm. High side pressure in PSI should be about 2.2 to 2.5 times outside air temperature in degrees F. Example if it's 90 degrees F, high side should be no higher than 225PSI
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Parallel condensers are nearly impossible to flush, and when you flush any of them, getting all the oil out with a non oily flush solvent is the key, the oil must be broken down. If there's oil residue in it, even pulsating it with air won't be sufficient, some will still be in there.
As far as I know, the refrigerant coming into or out from the condenser is in high pressure (high temperature), whereas the refrigerant coming into the evaporator (from expansion valve or orifice tube) is in low pressure (low temperature).
But, I guess this occurs only when the AC is operating (ON).
Since it's very difficult to access the evaporator, we pick the condenser side instead of the evaporator side when we want to check the refrigerant level, right ? We have to make sure the AC is OFF when we work on the condenser side. Am I right ?
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