Applications; A/C-Heater System - RayTek AUTOPRO Manual De Instrucciones

APPLICATIONS

TABLE OF CONTENTS
A/C-HEATER SYSTEM ...................................... 7
BEARINGS, BUSHINGS, CV JOINTS &
UNIVERSAL JOINTS ......................................... 8
BRAKES ......................................................... 9
COOLING SYSTEM ........................................ 11
ENGINE PERFORMANCE ................................ 13
HEATED SEATS ............................................. 15
REAR WINDOW DEFROSTER .......................... 16
TIRE PRESSURES & WHEEL ALIGNMENT ........ 16

A/C-Heater System

A/C System - Cooling
NOTE: Before and after perform-
ing repairs on the A/C refrigerant
system, discharge/charge refrig-
erant using approved refrigerant
recovery/recycling equipment.
When A/C is on and set at maximum cooling, air
temperature from instrument panel ducts should
be a minimum of 15°C (25°F) cooler than ambient
temperature. To verify A/C outlet temperature, start
vehicle and set A/C to coldest setting using dash
vents. Set A/C controls to MAX-A/C or re-circulate
position. Test-drive vehicle if possible. If test is
to be performed in service bay, place a large fan
in front of the vehicle to ensure A/C condenser
has sufficient airflow for an accurate temperature
reading. If vehicle is stationary, raise idle and allow
A/C system to stabilize before measuring outlet
temperature. Ensure windows are rolled up and
doors are closed.
CAUTION: To avoid thermal-shock
of IR thermometer, DO NOT hold
unit directly in the flow of the A/C
outlet when measuring A/C duct
surface temperature or measuring
other components near A/C ducts.
Hold unit off to one side when
measuring to avoid direct contact
with cold airflow.
Using the IR thermometer, measure A/C outlet
temperature. If outlet temperature is at 15°C
(25°F) cooler than ambient temperature, A/C
system is cooling sufficiently. If outlet temperature
is less than 15°C (25°F) cooler than ambient
temperature, check for the following:
n Restricted liquid line to evaporator (check for
ice on liquid line to
evaporator).
n Restricted expansion valve or orifice tube
(check for ice on expansion valve or orifice
tube).
Measure temperature of condenser to check
for cold spots. If cold spots are found, this will
indicate a restriction in the condenser. Parallel
flow condensers will normally have an even
temperature drop from one side to the other
while serpentine condensers will show a drop in
temperature from top to bottom.
If A/C compressor is cycling on and off with less
"on" time than normal, check for low refrigerant
charge. If A/C compressor is not operating at all,
diagnose and repair A/C system using appropriate
service information.
Automatic A/C System
On many vehicles with automatic A/C systems,
sensors are used to determine ambient (outside)
and cabin (in-car) temperatures to control func-
tions of the A/C-Heater system. Often, along with
these sensors, the A/C system may have
the ability to display current ambient and in-car
temperature provided by these sensors, on the
A/C controls. Most ambient temperature sensors
are mounted outside the passenger compartment,
near the front of the vehicle. Most in-car tempera-
ture sensors are mounted on the instrument panel.
See manufacturer's information to identify exact
location of sensors, if equipped. To verify correct