Toyota Prius 2010 Repair Manual page 333

2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
HINT:
This is a method where a manifold gauge set is used to help locate the problem.
(a) Read the manifold gauge pressure when the following conditions are met:
Test conditions:
Temperature at the air inlet with the switch set at RECIRC is 30 to 35°C (86 to 95°F).
The blower speed control switch position is at "HI".
The temperature control dial position is at "COOL".
The A/C switch is on.
Doors are fully open.
The power switch is in a position that enables the A/C compressor to run.
(2) Moisture is present in the refrigeration system.
2010 Toyota Prius
Immediately after air
conditioning is turned
6 off, refrigerant foams
and then becomes
clear
*: Bubbles in the sight glass with the vehicle's interior temperature above
35°C (95°F) can be considered normal if cooling is sufficient.
(1) Normally functioning refrigeration system
Gauge Reading
Pressure Side
Low 0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm
High 1.37 to 1.57 MPa (13.9 to 16.0 kgf/cm
Proper
Refrigerant Volume
amount of
refrigerant
-
2
, 21 to 36 psi)
2
, 199 to 228 psi)
Repair Manual