Air conditioner

Good afternoon.

What is the high side pressure and low side pressures while running?

How much Freon did you put in the system?

Roy

Capacity 33 oz (0.94 kg).

How does the dryer feel while it is running?

1. Visual inspection
Open the hood and visually inspect the heating and air conditioning systems for the following:
Coolant reservoir for correct coolant level.
Heater hoses for deterioration or loose connections.
Radiator and condenser for debris or damaged fins restricting airflow, loose mounting or connections.
Accessory drive belt(s) and cooling fan(s) for wear or physical damage.
Refrigerant lines and connections for physical damage or loose connections.
Compressor for physical damage or loose connections.
Suction accumulator/drier for physical damage or loose connections.
Wiring and connectors for excessive wear, loose or damaged connections, or incorrect routing.

2. A/C refrigerant analysis
Carry out air conditioning refrigerant analysis.
If the refrigerant falls the analysis, discontinue diagnosis and make recommendations for repairs.
If the refrigerant passes the analysis, carry out the air conditioning system check.

3. Air conditioning system check
Connect manifold gauge set or charging station with gauges to refrigerant system.
With the vehicle in park, parking brake set, thermometer installed in center panel vent, and air conditioning system on and set to MAX A/C, start the engine.
Record air refrigerant system pressures while running the engine at 1,500 rpm and allow engine to return to idle.
Operate the blower motor in all control positions and check for correct blower speed changes.
With the blower motor on HI, operate air discharge mode selector in all positions and check for correct airflow in each position.
Operate the temperature blend selector in all positions and check for correct change in discharge temperature. Check the air discharge temperature with the selector in the coolest position and the air conditioning on and set to MAX A/C to determine if the air discharge temperature is acceptable for the current ambient air temperature.
Carry out the EATC self-test (if applicable). See: Heating and Air Conditioning > Reading and Clearing Diagnostic Trouble Codes > Electronic Automatic Temperature Control Module Self-Test

If the refrigerant system pressures were low, carry out the refrigerant system leak test.

4. Refrigerant system leak test
Use either an Ultraviolet (UV) or an electronic leak detector to check for leaks at all refrigerant lines, connections, and components.

After all tests have been completed, report all findings and recommended repairs to your service advisor before carrying out further diagnostic procedures.

What was the low side pressure?

Roy

That is not good.

The low side should be 25-30 lbs and rock solid. At 40-50 lbs the Freon is flooding the evaporator and very little cooling will result.

Is the cooling fan working? That is critical to lower the high side pressure.

It already looks like you need an expansion valve and a dryer to start.

Roy

That is not the dryer.

I attached a picture for you. It is bolted to the firewall and has a low pressure switch mounted on it.

It is part of the low side line.

Roy

Glad to help. Feel free to follow up if you have any other questions.

Roy