Chevrolet Silverado / GMC Sierra. Manual

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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Chevrolet Silverado / GMC Sierra. Manual - part 1217