How to readR134A ac manifold gauges

See the pressures list in this post

http://ricksfreeautorepairadvice.com/abnormal-ac-manifold-gauge-readings/

not mentioned but did you replace with equipment specific for r134a gas
are you connected to the suction line and are sucking gas not liquid
are you using the duel gauge ,3 hosed manifold for the charging process or have you just connected the bottle and hoping for the best
take it to a qualified ac specialist shop

Verify ambient temperature is above 65 degrees F.

1. Safety> - safety glasses, long sleeves and gloves, (exposure to refrigerant can cause frostbite).

2. Attach hoses to manifold> assembly, (hi, lo, and fill).

3. Remove caps from service ports, (Low press. Larger tube from evaporator to accumulator - passenger side over fender well; High Pressure - smaller tube from evaporator along firewall towards driver's side). Verify service> ports are clean.

4. Attach low press. and high press hoses to proper service ports.

5. Start car>, reset low refrig code, and turn ac on high and fan on high.

6. Read gauges and compare with chart provided with gauge set.

7. If low and high press readings are both low, then system needs recharge.

8. To recharge, attach fill hose to can of R134a and slowly open low press valve>, (NOT HIGH PRESS VALVE), until low press side reads 40 psi.

9. When flow stops and pressures stabilize close valves> and disconnect manifold from service ports and refrigerant can. Replace service port caps.

It doesn't take freon, it takes R134A. There should be a sticker in the engine compartment that tells the amount. but when filling low side should be somewhere between 25-45 and high side 150-300. if you are serious about charging your own system please purchase a set of manifold gauges. it is the only way to properly charge the system. Harbor freight tools has a set for $45 and big lots sells refrigerant for $6. using the pregauged cans to fill your system is a hack way to do it and can be harmful to your ac system. Properly charging the system has a direct relationship to the outside ambient temperature and you can find a R134A reference chart on google images with a simple search. Good luck and also there are some pretty good videos on youtube about using manifold gauges and recharging refrigerant.

by using manifold gauge. and must read on it, 38psi for the low side and 180psi for the high side.

To connect the hose to the can, it should have a locking ring with a valve. Some connectors screw on clockwise, and others snap on and clamp downward with a locking lever. To open the can, just turn the T valve down clockwise. To release the freon into the hose, turn the valve to the left. Never remove can from the valve assembly, until the can is empty. If you have no clamp and valve for the freon, just a hose, you can buy one at your local auto parts store

The most common manifold are only for r-12 and R134A. Because of the pressure differences between that and R22 and R-410A ( and the manufactors make more money by keeping the types of manifolds seperate). I haven't seen a universal manifold that would cover all types freon.

The AC manifold gauges set have the three chambers: the low pressure chamber (left side), utility chamber (middle), and the high pressure chamber (right side).

When technicians connect the HVAC manifold gauge to the air conditioner units, he connects the low pressure side of air conditioner unit to low pressure gauge side.

If he wants to read the pressure in discharge line he connects the high pressure gauge hose to the air conditioner high pressure side.

The utility port (the middle chamber) is a place you connect the hose to vacuum pump, recovery units or add or remove refrigerant from AC units.

Air conditioning gauges is used to measure air conditioner units pressure within closed-system to evaluate or troubleshoot the AC units. Gauges manifold set is the most frequently used item when it comes to refrigerant or pressure.

Air conditioning gauge set allows the HVAC technician to check AC units operating pressures, transfer AC refrigerant, pressure test system, purge the system with nitrogen, and perform other necessary tasks.

The gauges manifold set includes the hoses, the manifold, the valves, the compound gauge (low pressure gauges) and high pressure gauge.

The ac system may need freon added,if the system is low,or out of freon,it will not allow the ac compressor to come on.

This car uses R134A no freon