Chevrolet Silverado / GMC Sierra. Manual — part 1217
Starter clutch slipping
See STARTER article
Broken clutch housing
See STARTER article
Pinion shaft rusted or dry
See STARTER article
Engine basic timing incorrect
See Ignition Timing in
TUNE-UP article
Broken teeth on engine flywheel
Replace flywheel and
check for starter pinion
gear damage
Starter Will Not Crank Engine
Faulty overrunning clutch
See STARTER article
Broken clutch housing
See STARTER article
Broken flywheel teeth
Replace flywheel and
check for starter pinion
gear damage
Armature shaft sheared or reduction gear teeth stripped
See STARTER article
Weak battery
Charge or replace battery
as necessary
Faulty solenoid
See On-Vehicle Tests in
STARTER article
Poor grounds
Check all ground
connections for tight and
clean connections
Ignition switch faulty or misadjusted
Adjust or replace ignition
switch as necessary
Starter Cranks Engine Slowly
Battery weak or defective
Charge or replace battery
as necessary
Engine overheated
See ENGINE COOLING
SYSTEM article
Engine oil too heavy
Check that proper viscosity
oil is used
Poor battery-to-starter connections
Check that all between
battery and starter are
clean and tight
Current draw too low or too high
See Bench Tests in
STARTER article
Bent armature, loose pole shoes screws or worn bearing
See STARTER article
2008 Chevrolet Silverado 1500
GENERAL INFORMATION Trouble Shooting - Basic Procedures
Burned solenoid contacts
Replace solenoid
Faulty starter
Replace starter
Starter Engages Engine Only Momentarily
Engine timing too far advanced
See Ignition Timing in
TUNE-UP article
Overrunning clutch not engaging properly
Replace overrunning
clutch. See STARTER
article
Broken starter clutch
See STARTER article
Broken teeth on engine flywheel
Replace flywheel and
check starter pinion gear
for damage
Weak drive assembly thrust spring
See STARTER article
Weak hold-in coil
See Bench Tests in
STARTER article
Starter Drive Will Not Engage
Defective point assembly
See Testing in STARTER
article
Poor point assembly ground
See Testing in STARTER
article
Defective pull-in coil
Replace starter solenoid
Starter Relay Does Not Close
Dead battery
Charge or replace battery
as necessary
Faulty wiring
Check all wiring and
connections leading to
relay
Neutral safety switch faulty
Replace neutral safety
switch
Starter relay faulty
Replace starter relay
Starter Drive Will Not Disengage
Starter motor loose on mountings
Tighten starter attach bolts
Worn drive end bushing
See STARTER article
Damaged engine flywheel teeth
Replace flywheel and
starter pinion gear for
damage
Drive yolk return spring broken or missing
Replace return spring
2008 Chevrolet Silverado 1500
GENERAL INFORMATION Trouble Shooting - Basic Procedures
Faulty ignition switch
Replace ignition switch
Insufficient clearance between winding leads to solenoid
terminal and main contact in solenoid
Replace starter solenoid
Starter clutch not disengaging
Replace starter clutch
Ignition starter switch
Replace ignition switch
contacts sticking
Starter Relay Operates but Solenoid Does Not
Faulty solenoid switch, switch connections or relay
Check all wiring between
relay and solenoid or
replace relay or solenoid
as necessary
Broken lead or loose soldered connections
Repair wire or wire
connections as necessary
Solenoid Plunger Vibrates When Switch is Engaged
Weak battery
Charge or replace battery
as necessary
Solenoid contacts corroded
Clean contacts or replace
solenoid
Faulty wiring
Check all wiring leading to
solenoid
Broken connections inside switch cover
Repair connections or
replace solenoid
Open hold-in wire
solenoid
Low Current Draw
Worn brushes or weak brush springs
Replace brushes or brush
springs as necessary
High Pitched Whine During Cranking Before Engine Fires but Engine Fires and Cranks
Normally
Distance too great between starter pinion and flywheel
Align starter or check that
correct starter and
flywheel are being used
High Pitched Whine After Engine Fires With Key released. Engine Fires and Cranks
Normally
Distance too small between starter pinion and flywheel
Flywheel runout
contributes to the
intermittent nature
2008 Chevrolet Silverado 1500
GENERAL INFORMATION Trouble Shooting - Basic Procedures
AIR CONDITIONING & HEAT
AIR CONDITIONING TROUBLE SHOOTING
BASIC AIR CONDITIONING TROUBLE SHOOTING CHART
WARNING:
This is GENERAL information. This article is not intended to
be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to problem
symptoms. For model-specific Trouble Shooting, refer to
SUBJECT, DIAGNOSTIC, or TESTING articles available in the
section(s) you are accessing.
CONDITION
POSSIBLE CAUSE
Compressor Not Working
Compressor clutch circuit open.
. .
Compressor clutch coil inoperative.
. .
Poor clutch ground connection.
. .
Fan belts loose.
. .
Thermostatic switch inoperative.
. .
Thermostatic switch not adjusted.
. .
Ambient temperature switch open.
. .
Superheat fuse blown.
Excessive Noise or
Vibration
Missing or loose mounting bolts.
. .
Bad idler pulley bearings.
. .
Fan belts not tightened correctly.
. .
Compressor clutch contacting body.
. .
Excessive system pressure.
. .
Compressor oil level low.
. .
Damaged clutch bearings.
. .
Damaged reed valves.
. .
Damaged compressor.
Insufficient or No Cooling;
Compressor Working
Expansion valve inoperative.
. .
Heater control valve stuck open.
. .
Low system pressure.
. .
Blocked condenser fins.
2008 Chevrolet Silverado 1500
GENERAL INFORMATION Trouble Shooting - Basic Procedures
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