Checking With Expansion Valve And Receiver/Dryer, Without Regulated A/C Compressor: Checking
-- Turn off the ignition.
-- Connect pressure gauge battery (A/C service station).
-- Take pressure gauge readings. There are two possible results A and B.
| Ambient Temperature in Degrees Celsius (Fahrenheit) | Pressure in Refrigerant Circuit in Bar (psi) Positive Pressure |
|---|---|
| 15 °C (60 °F) | 3.9 (57 psi) |
| 20 °C (68 °F) | 4.7 (68 psi) |
| 30 °C (86 °F) | 6.7 (97 psi) |
| 40 °C (104 °F) | 9.1 (132 psi) |
- A- The pressure in the refrigerant circuit is lower than the pressure specified in the table. There is not enough refrigerant in the circuit.
- Search for leak with leak detection device.
- The pressure release valve is open, check coolant fan activation according to the wiring diagram.
Check refrigerant pipes and hoses to see if they are bent too sharply (cross-section constrictions) or have external damage. If no malfunction is found, flush refrigerant circuit.
- B - The pressure in the refrigerant circuit matches the table or is higher.
-- Start the engine.
-- Set A/C system to maximum cooling output.
-- Open doors.
-- Open vents in instrument panel.
The A/C compressor is driven by the engine via the magnetic clutch using the ribbed belt.
If the A/C compressor is not driven, check A/C Clutch -N25- voltage supply.
If the voltage supply is OK, repair the magnetic clutch.
If the A/C compressor is driven, check refrigerant circuit:
-- Bring engine speed up to 2000 RPM.
-- Observe manometer battery: