Bearings, Bushings, Cv Joints & Universal Joints - RayTek Rayst25 Autopro User Manual

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A/C-Heater System (Cont.)
compartment, near the front of the vehicle. Most
in-car temperature sensors are mounted on the
instrument panel. See manufacturer's information
to identify exact location of sensors, if equipped.
To verify correct operation of sensors, use the IR
thermometer to measure ambient temperature
near the ambient temperature sensor and in-car
temperature near the in-car temperature sensor.
Compare readings to A/C control. If the
measured and displayed temperatures are not
approximately the same, a problem with the
sensor or A/C system may exist.
Heater System
WARNING:
Engine coolant can reach
temperatures exceeding 125°C (260°F). Allow
engine to cool before performing repairs on
heater system or serious injury may occur.
Heater systems on most vehicles are connected
directly to the engine cooling system using the
engine water pump and coolant system pressure
to provide coolant to the heater core. On other
vehicles a separate water pump is used to
circulate water for the heater system. A heater
control valve, controlled by the A/C system, is
used in some applications to stop flow of coolant
into heater core to prolong heater core life and to
aid in cooling the passenger compartment when
A/C is in use. When trouble shooting heater
cores, ensure A/C system is off and heater
control valve is open as to not stop flow of
coolant to heater core. Inspect coolant level and
top off as necessary to ensure air will not be
trapped in heater core during testing.
Ensure vehicle is at operating temperature,
approximately 85-105°C (190-220°F). Verify
operating temperature has been reached by
measuring temperature at upper radiator hose
near the thermostat housing. If vehicle does not
reach operating temperature, trouble shoot the
cooling system first.
Using the IR thermometer, measure inlet and
outlet hose temperature near firewall. The
temperature reading of the inlet hose should be
approximately 10°C (20°F) hotter than the outlet
8
hose. If the outlet hose is not hot or the
temperature differential between the inlet and the
outlet hose is greater than 10°C (20°F), coolant
is not flowing through the heater core. Check for
the following:
Plugged/Restricted heater core.
Heater control valve not opening.
Bearings, Bushings, CV Joints
& Universal Joints
Bearings, bushings, CV joints and universal joints
all have friction surfaces that require proper
clearance and lubrication to operate properly.
Some of these components are sealed and do
not require service while some are equipped with
fittings to allow regular maintenance. Following
manufacturers recommended maintenance
intervals is key to ensuring proper operation of all
friction surfaces.
Bearings & Bushings – Including
Trailers
Most bearing and bushing problems can be
related with a growl noise or metal-on-metal
contact. Once a noise is heard, damage has
occurred. A bearing or bushing that has
deteriorated this far can possibly damage the
component it has been designed to protect. To
prevent this type of damage, whenever possible,
perform a through visual inspection to check for
damaged or leaking seals. On wheel bearings,
check for uneven wear of brake pads or
excessive axial movement of wheels.
Bearings and bushings can be checked before
damage occurs. To check for deteriorating wheel
bearings, test-drive vehicle a short distance. Stop
vehicle, place in Park (auto trans) or neutral
(manual trans) and set parking brake.
Using the IR thermometer, measure
temperatures at all wheel bearings and/or hubs.
The bearing or hub with a higher temperature as
compared to other bearings/hubs will indicate
potential bearing failure. Verify that a brake drag
is not causing the difference in temperature.
Inspect components and repair as necessary.
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