Note: This procedure charges the A/C system with liquid refrigerant through the high pressure service port. The refrigerant bottle in this procedure must be installed with the valve down to supply liquid refrigerant.
Caution: Never start the engine while priming the system through the high pressure service port. Do not open the gauge manifold low pressure valve when charging the system with liquid refrigerant.
1. Close both valves on the gauge manifold fittings tightly when the system has been evacuated.
2. Install a valve on the refrigerant charge cylinder as described in section "Preparing the refrigerant bottle for charging the system".
3. Fully open the high pressure valve and install the filling cylinder with the stopcock down.
4. Charge the air conditioning system with the nominal amount of refrigerant. Determine the amount of refrigerant charged by weighing the cylinder on a balance. Overcharging refrigerant will cause an unacceptably high compressor delivery pressure (in the high pressure line). Close the high pressure valve after filling.
- Coolant quantity: 680±25g
Note: if the low pressure gauge does not show the pressure in the system, then the system is clogged (pipelines blocked) and needs to be repaired.
5. After charging the system with the nominal amount of refrigerant, close all the gauge manifold valves.
6. Check the system for refrigerant leaks using a leak detector and repair any problems found (leaks). (See section "Locating refrigerant leaks").
Note: for quality work, it is recommended to test the efficiency of the air conditioner before disconnecting the measuring manifold from the system.