Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling is sufficient

2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

Check the trouble area using a set of manifold gauge set. Read the manifold gauge pressure when following conditions are detected.

Test conditions:

♦ Temperature at the air inlet with the switch set at RECIRC is 30 - 35 °C (86 - 95 °F)

♦ Engine running at 2,000 rpm

♦ Fan speed selector at "HI" position

♦ Temperature control dial on "COOL" position

HINT:

It should be noted that the gauge indications may vary depending on ambient temperature conditions.

(1) Normally functioning refrigeration system.

Gauge reading:

Low pressure side:

High pressure side:

(2) Moisture present in refrigeration system.

I01387

Symptom seen in refrigeration system

Probable cause

Diagnosis

Remedy

During operation, pressure on low pressure side sometimes become a vacuum and sometime normal

Moisture entered in refrigeration system freezes at expansion valve orifice and temporarily stops cycle, but normal state is restored after a time when the ice melts

♦Drier in over-saturated state ♦Moisture in refrigeration system freezes at expansion valve orifice and blocks circulation of refrigerant

(1) Replace condenser

(2) Remove moisture in cycle through repeatedly evacuating air

(3) Charge proper amount of new refrigerant

Was this article helpful?

0 0

Post a comment