Exam question or EPA violator?
Low pressure line\ Larger hose from the compressor
Low pressure line from the compressor (Larger hose)
Freon is added to the low side of the a/c system, that is the big line and the capis normally blue in color.
Th low pressure valve s located to the right of the site glass (where you check your freon activity) The hose is black with a nozzle on it and has a nipple you can check for pressure. Close to black low pressure line a blue high pressure line
Check the ports to add freon--the low side is a large hose --the high pressure is the small line--on the large line if the valve is the large style----the freon is R134--if the valve is the small style it is R12--no longer used --retro valves are available to convert R12 systems to R134 R12 fittings can't be connected to R134 gauges, and vice versa. If it's R12 you won't be able to connect the hose from the supply can to fill it, or do anything else with R134 equipment.
Fabricate and adapt a smaller hose to your vacuum cleaner and attach the smaller hose to the drain tube to suck out the debris. You could blow it in with compressed air but then the debris will only plug it up again.
The line that you fill freon to in a car is known as the fill line. Going past the line can cause overflow, or even damage your vehicle.
your ac / evaporator coil can freeze up. check you liquid line ( smaller refrigerant line by ac evaporator coil) if line is pounding and very hot, chances are your system is low on Freon ,,, also check condenser and ensure that its clean an condenser fan / fans are operating as designed.
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The easiest way to tell on a R-134a system: The Low Pressure valve or Blue is on the big A/C Hose which gets cold. The high pressure or red, is on the smaller A/C hose which gets very hot!. NEVER recharge through the red service port. Pressure in excess of 200 psi are possible!!
there are 2 valves on the large refrigerant line on the front passenger corner of your engine compartment, one large and one small, freon is always added through the smaller of the 2. Pick up a kit for it at auto zone
Year? Just a brief suggestion, it will be difficult to find Freon and if you do, it is expensive. The newer refrigerant, 134a, is much more readily available and far cheaper. In general, connect your charging aparatus (whichever type you have) to the LOW side of the refrigeration system. Two lines lead from the compressor. One goes to the condenser (the radiator looking coil that's in front of the regular radiator) and the other line goes to the receiver/dryer. The line that goes to the receiver/dryer is the low pressure side. There should be a port somewhere near the receiver/dryer, that's where you connect to add refrigerant. You'll need a gauge to know when to stop, and you may need to jumper the low pressure switch that is on the side of the receiver/dryer, otherwise it will take forever to get enough refrigerant to start getting the system to pump.