Winnebago 1987-1989 LeSharo Service Manual page 607

I
DIAGNOSIS OF Ale SYSTEM
In most instances, when a vehicle is brought in for
air conditioning service work, the complaint will be
"Lack of Cooling" or "Insufficient Cooling". The
first problem will be to determine why the air
conditioner is not operating at normal efficiency.
The conditions summarized on the following pages
cover the common causes of the air conditioner
failure to cool the vehicle satisfactorily. A
corrective procedure is detailed for each condition.
Perform the following diagnostic procedure to
determine the conditions applying to each
particular case.
DIAGNOSIS PROCEDURE
1. Connect the gauge manifold set to the high
and low side connections at the compressor.
2. Operate air conditioner to stabilize system and
perform an operating test.
3. Note gauge readings and other indications as
listed under "Conditions". Refer to
"Pressure-Temperature Relationship" chart if
ambient temperature is not the same as that
listed. NOTE: "Shaded" section of chart
indicates normal operating range (see page
N4-3).
4. Note trouble as listed under complaint and
make any additional tests indicated.
5. Perform all corrective procedures indicated
under "Correction".
N4-1