Contents Wiring diagrams Section: Cooling System (Mechanical) All sections

Engine Cooling System: Specifications Chevrolet Silverado Classic 2500 HD

Cooling System (Mechanical) 10 illustrations ~106 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Air Cleaner Outlet Duct Clamp4 N.m35 lb in
Air Conditioning (A/C) Compressor Bolt (6.6L)50 N.m37 lb ft
Air Inlet Tube Nut (6.6L)25 N.m18 lb ft
Auxiliary Water Pump Bracket Nut9 N.m80 lb in
Bypass Pipe to Water Pump Bolt (6.6L)21 N.m16 lb ft
Charged Air Cooler Duct Clamp (6.6L)6 N.m53 lb in
Coolant Air Bleed Pipe Cover Bolt (4.8L, 5.3L, and 6.0L)12 N.m106 lb in
Coolant Air Bleed Pipe Stud/Bolt (4.8L, 5.3L, and 6.0L)12 N.m106 lb in
Coolant Heater (4.8L, 5.3L, and 6.0L)50 N.m37 lb ft
Coolant Heater (8.1L)60 N.m47 lb ft
Coolant Heater Bolt (4.3L)2 N.m18 lb in
Coolant Heater Bolt (6.6L)2 N.m18 lb in
Coolant Heater Cord Bolt8 N.m71 lb in
Coolant Outlet Pipe Clip Bolt (6.6L)9 N.m80 lb in
Cooling Fan Motor Bolt10 N.m89 lb in
Engine Block Coolant Drain Plug60 N.m44 lb ft
Engine Cooling Fan Shroud Bolt8 N.m71 lb in
Engine Shield Bolt20 N.m15 lb ft
Exhaust Gas Recirculation (EGR) Coolant Pipe Bolt (6.6L)21 N.m16 lb ft
Exhaust Manifold Pipe Nut (4.8L, 5.3L, and 6.0L)50 N.m37 lb ft
Fan Clutch Bolt23 N.m17 lb ft
Fan Clutch Nut56 N.m41 lb ft
Fan Pulley Bolt/Nut (6.6L)46 N.m34 lb ft
Fan Shroud Bolt9 N.m80 lb in
Fuel Line Bracket Bolt (6.6L)21 N.m15 lb ft
Fuel Line to Fuel Injection Control Module Bolt (6.6L)35 N.m26 lb ft
Generator Bracket Bolt (6.6L and 8.1L)50 N.m37 lb ft
Generator Bracket Stud (8.1L)20 N.m15 lb ft
Generator Control Module (GCM) Brace Bolts25 N.m18 lb ft
Generator Control Module (GCM) Coolant Pump Bolts9 N.m80 lb in
Generator Control Module (GCM) Coolant Tank Bolts20 N.m15 lb ft
Generator Control Module (GCM) Coolant Tank Nuts9 N.m80 lb in
Generator Control Module (GCM) Cooling Fan Bolt9 N.m80 lb in
Generator Control Module (GCM) Radiator Bolt9 N.m80 lb in
Generator Positive Cable Nut (6.6L)9 N.m80 lb in
Heater Inlet Pipe to Fuel Filter Bolt (6.6L)21 N.m16 lb ft
Heater Inlet Pipe to Thermostat Bolt (6.6L)21 N.m16 lb ft
Heater Outlet Hose Bracket Bolt (6.6L)21 N.m16 lb ft
Hood Hinge Bolts25 N.m18 lb ft
Idler Pulley Bolt (6.6L)43 N.m32 lb ft
Intake Manifold Cover Clamp (6.6L)6 N.m53 lb in
Junction Block Bracket Bolt (6.6L)9 N.m80 lb in
Main Electrical Harness Bracket Bolt (6.6L)21 N.m15 lb ft
Main Engine Electrical Harness Connector Bolt (6.6L)10 N.m89 lb in
Oil Cooler Hose Adapter Bolt (6.0L)12 N.m106 lb in
Oil Cooler Hose Bracket Bolt (6.0L)25 N.m18 lb ft
Oil Cooler Hose Bracket Bolt (8.1L)50 N.m37 lb ft
Positive Crankcase Ventilation (PCV) Oil Separator Bracket Nut (6.6L)21 N.m16 lb ft
Power Steering Pump Bracket Bolt (6.6L)46 N.m34 lb ft
Radiator Bolt25 N.m18 lb ft
Starter/Generator Stator Coolant Inlet Pipe Bolt9 N.m80 lb in
Surge Tank Bolt/Nut9 N.m80 lb in
Thermal Bypass Fitting35 N.m26 lb ft
Thermal Bypass Hose Bolt10 N.m89 lb in
Thermostat Housing Bolt (4.8L, 5.3L, and 6.0L)15 N.m11 lb ft
Thermostat Housing Cover Bolt (6.6L)21 N.m16 lb ft
Thermostat Housing Crossover Bolt/Nut (6.6L)21 N.m16 lb ft
Transmission Control Module (TCM) Cover Bolt9 N.m80 lb in
Transmission Control Module (TCM) Electrical Connector Bolt8 N.m71 lb in
Turbocharger Coolant Bypass Valve (6.6L)60 N.m44 lb ft
Turbocharger Coolant Feed Pipe Bracket Bolt (6.6L)21 N.m16 lb ft
Turbocharger Coolant Feed Pipe Nut (6.6L)9 N.m80 lb in
Turbocharger Coolant Inlet Banjo Bolt (6.6L)25 N.m18 lb ft
Turbocharger Coolant Outlet Pipe Bolt/Nut (6.6L)9 N.m80 lb in
Water Crossover Bolt (8.1L)50 N.m37 lb ft
Water Outlet Bolt (8.1L)30 N.m22 lb ft
Water Outlet Stud (4.3L)25 N.m18 lb ft
Water Outlet Tube Bolt (6.6L)21 N.m16 lb ft
Water Pump Bolt (4.3L)45 N.m33 lb ft
Water Pump Bolt (4.8L, 5.3L, and 6.0L)
First Pass15 N.m11 lb ft
Final Pass30 N.m22 lb ft
Water Pump Bolt (6.6L)21 N.m16 lb ft
Water Pump Bolt (8.1L)50 N.m37 lb ft
Water Pump Inlet Pipe Bolt (6.6L)21 N.m16 lb ft
Water Pump Pulley Bolt (4.3L)25 N.m18 lb ft
Water Pump to Oil Cooler Inlet Pipe Nut (6.6L)21 N.m16 lb ft
Wiring Harness Bracket to Thermostat Housing Bolt (6.6L)8 N.m71 lb in

Fastener Tightening Specifications

Scheme 1

Scheme 1: Engine Cooling Schematics

Scheme 2

Scheme 2

Scheme 3

Scheme 3: Cooling System Component Views
CalloutComponent Name
1Auxiliary Battery Relay (TP2)
2A/C Accumulator
3A/C Low Pressure Switch
4Inner Wheel Well
5Coolant Level Switch Connector Diesel and 8.1L
6Mass Air Flow (MAF) Sensor
7Air Cleaner Assembly
8Engine Coolant Recovery Reservoir
9Auxiliary Battery Relay Electrical Connector (TP2)
10Battery Right (TP2)

Scheme 4

Scheme 4
CalloutComponent Name
1Auxiliary Water Pump

Scheme 5

Scheme 5
CalloutComponent Name
1Cooling Fan - Right
2Radiator Core Support
3Starter/Generator Control Module Coolant Pump

Scheme 6

Scheme 6
CalloutComponent Name
1Cooling Fan - Left
2Cooling Fan - Right
3Forward Lamp Harness

Scheme 7

Scheme 7: Auxiliary Water Pump (HP2)
Connector Part Information OEM: 12084126 Service: 89046833 Description: 2-Way F Sealed (BK)

Auxiliary Water Pump (HP2) Connector & Terminal Parts Information

PinWire ColorCircuit No.Function
1BK550Ground
2TN/WH5543Auxiliary Heater Pump Voltage

Auxiliary Water Pump (HP2) Terminal Identification

Scheme 8

Scheme 8: Coolant Level Switch (8.1L)
Connector Part Information OEM: 12052644 Service: See Catalog Description: 2-Way F Metri-Pack 150 Series Sealed (GY)
Terminal Part Information Pins: A Terminal/Tray: See Terminal Repair Kit Core/Insulation Crimp: See Terminal Repair Kit Release Tool/Test Probe: See Terminal Repair Kit Pins: B Terminal/Tray: 12048074/2 Core/Insulation Crimp: E/1 Release Tool/Test Probe: 12094429/J-35616-2A (GY)

Coolant Level Switch (8.1L) Connector & Terminal Parts Information

PinWire ColorCircuit No.Function
AL-GN1478Coolant Level Switch Signal
BBK550Ground

Coolant Level Switch (8.1L) Terminal Identification

Scheme 9

Scheme 9: Coolant Level Switch (Diesel)
Connector Part Information OEM: 15324243 Service: Not Serviced Description: 2-Way F Metri-Pack 150 Series Sealed (GY)
Terminal Part Information Terminal/Tray: 12048074/2 Core/Insulation Crimp: E/1 Release Tool/Test Probe: 12094429/J-35616-2A (GY)

Coolant Level Switch (Diesel) Connector & Terminal Parts Information

PinWire ColorCircuit No.Function
AL-GN1478Coolant Level Switch Signal
BBK550Ground

Coolant Level Switch (Diesel) Terminal Identification

Scheme 10

Scheme 10: Cooling Fan - Left (10 Series)
Connector Part Information OEM: 15454358 Service: 88987983 Description: 2-Way F GT 630 Series (BK)
Terminal Part Information Terminal/Tray: 15455571/23 Core/Insulation Crimp: F/3 Release Tool/Test Probe: 15315247/J-35616-42 (RD)

Cooling Fan - Left (10 Series) Connector & Terminal Parts Information

PinWire ColorCircuit No.Function
AYE5358Cooling Fan Motor Control
BGY532Cooling Fan Motor Supply Voltage

Cooling Fan - Left (10 Series) Terminal Identification