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HEATER SYSTEM TROUBLE SHOOTING BASIC HEATER SYSTEM TROUBLE SHOOTING CHART ..... Blocked evaporator fins. ..... Vacuum system leak. ..... Vacuum motors inoperative. ..... Control cables improperly adjusted. ..... Restricted air inlet. ..... Mode doors binding. ..... Blower motor inoperative. ..... Temperature above system capacity. NOTE: This is GENERAL information. This article is not intended to be CONDITION POSSIBLE CAUSE Insufficient, Erratic, or No Heat Low Coolant Level ..... Incorrect thermostat. ..... Restricted coolant flow through core. ..... Heater hoses plugged. ..... Misadjusted control cable. ..... Sticking heater control valve. ..... Vacuum hose leaking. ..... Vacuum hose blocked. ..... Vacuum motors inoperative. ..... Blocked air inlet. ..... Inoperative heater blower motor. ..... Oil residue on heater core fins. ..... Dirt on heater core fins. Too Much Heat Improperly adjusted cables. ..... Sticking heater control valve. ..... No vacuum to heater control valve.
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
BRAKES BRAKE SYSTEM TROUBLE SHOOTING BRAKE SYSTEM TROUBLE SHOOTING CHART ..... Temperature door stuck open. Air Flow Changes During Vacuum system leak. ..... Bad check valve or reservoir. Air From Defroster At All Times Vacuum system leak. ..... Improperly adjusted control cables. ..... Inoperative vacuum motor. Blower Does Not Operate Blown fuse. ..... Blower motor windings open. ..... Resistors burned out. ..... Motor ground connection loose. ..... Wiring harness connections loose. ..... Blower motor switch inoperative. ..... Blower relay inoperative. ..... Fan binding or foreign object in housing. ..... Fan blades broken or bent. NOTE: This is GENERAL information. This article is not intended to be CONDITION & POSSIBLE CAUSE CORRECTION Brakes Pull Left or Right Incorrect tire pressure Inflate tires to proper pressure Front end out of alignment See WHEEL ALIGNMENT Mismatched tires Check tires sizes
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Restricted brake lines or hoses Check hose routing Loose or malfunctioning caliper See DISC BRAKES or BRAKE SYSTEM Bent shoe or oily linings See DRUM BRAKES or BRAKE SYSTEM Malfunctioning rear brakes See DRUM, DISC BRAKES or BRAKE SYSTEM Loose suspension parts See SUSPENSION Noises Without Brakes Applied Front linings worn out Replace linings Dust or oil on drums or rotors See DRUM, DISC BRAKES or BRAKE SYSTEM Noises With Brakes Applied Insulator on outboard shoe damaged See DISC BRAKES or BRAKE SYSTEM Incorrect pads or linings Replace pads or linings Brake Rough, Chatters or Pulsates Excessive lateral runout Check rotor runout Parallelism not to specifications Reface or replace rotor Wheel bearings not adjusted See SUSPENSION Rear drums out-of-round Reface or replace drums Disc pad reversed, steel against rotor Remove and reinstall pad Excessive Pedal Effort Malfunctioning power unit See POWER BRAKES or BRAKE SYSTEM Partial system failure Check fluid and pipes Worn disc pad or lining Replace pad or lining Caliper piston stuck or sluggish See DISC BRAKES or BRAKE SYSTEM Master cylinder piston stuck See MASTER CYLINDERS or BRAKE SYSTEM Brake fade due to incorrect pads for linings Replace pads or linings Linings or pads glazed Replace pads or linings
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Worn drums Reface or replace drums Excessive Pedal Travel Partial brake system failure Check fluid and pipes Insufficient fluid in master cylinder See MASTER CYLINDERS or BRAKE SYSTEM Air trapped in system See BRAKE BLEEDING or BRAKE SYSTEM Rear brakes not adjusted See Adjustments in DRUM BRAKES or BRAKE SYSTEM Bent shoe or lining See DRUM BRAKES or BRAKE SYSTEM Plugged master cylinder cap See MASTER CYLINDERS or BRAKE SYSTEM Improper brake fluid Replace brake fluid Pedal Travel Decreasing Compensating port plugged See MASTER CYLINDERS or BRAKE SYSTEM Swollen cup in master cylinder See MASTER CYLINDERS or BRAKE SYSTEM Master cylinder piston not returning See MASTER CYLINDERS or BRAKE SYSTEM Weak shoe retracting springs See DRUM BRAKES BRAKE SYSTEM Wheel cylinder piston sticking See DRUM BRAKES or BRAKE SYSTEM Dragging Brakes Master cylinder pistons not returning See MASTER CYLINDERS BRAKE SYSTEM Restricted brake lines or hoses Check line routing Incorrect parking brake adjustment See DRUM BRAKES
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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