Ford Corsar Repair Manual page 794

A/C PERFORMANCE TEST
Performance Test Diagnoses
Characteristics revealed by the manifold gauge In the following table, the portion smeared with
readings for the air conditioning system are shown ink on each gauge scale indicates the range showing
in the following.
that the air conditioning system is in good order.
For how to do the performance test, refer to the This range is described in Performance Chart.
item "Performance Chart".
Condition
INSUFFICIENT REFRIGERANT CHARGE
Insufficient cooling.
Bubbles appear in sight
glass.
ALMOST NO REFRIGERANT
Probable cause
Refrigerant is low, or
leaking slightly.
Serious refrigerant leak.
Expansion valve restricts
refrigerant flow.
Expansion valve is
clogged.
Expansion valve is in-
operative.
Valve stuck closed.
Thermal bulb has
lost charge.
AC353A
Corrective action
1
.
Leak test.
2. Repair leak.
3. Charge system.
Evacuate, a s necessary, and
recharge system.
Stop compressor immedi-
ately.
1. Leak test.
2. Discharge system.
3.
Repair leak(s).
4. Replace receiver drier if
necessary.
5.
Check oil level.
6. Evacuate and recharge
system.
If valve inlet reveals sweat
or frost:
1. Discharge system.
2. Remove valve and clean
it. Replace i t if necessary.
3. Evacuate system.
4. Charge system.
I f valve does not operate:
1. Discharge system.
2.
Replace valve.
3. Evacuate and charge
system.
No cooling action.
A lot of bubbles or
something like mist
appears in sight glass.
FAULTY EXPANSION VALVE
AC354A
Slight cooling.
Sweat or frosting on
expansion valve inlet.