LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1998 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing 7.4L >> Component Locations
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Component Locations

NOTE: Component location illustrations are not available at time of publication.
COMPONENT LOCATIONS (VIN J)

Component Location
A/C Compressor Clutch Cycling Switch On Top Of Accumulator, Right Rear Of Engine Compartment
A/C Compressor Clutch Relay In Power Distribution Box At Left Rear Of Engine Compartment
A/C High Pressure Cut-Out Switch On Rear Of A/C Compressor
A/C Low Pressure Cut-Off Switch On Top Of A/C Compressor, In High Pressure Line
Air Injection Reaction Relay In Power Distribution Box At Left Rear Of Engine Compartment
Auxiliary Cooling Fan Relay Left Rear Side Of Engine Compartment
Camshaft Position (CMP) Sensor In Distributor
Crankshaft Position (CKP) Sensor Lower Right Front Of Engine Block, Near Crankshaft
Cruise Control Module Left Rear Side Of Engine Compartment, On Bulkhead
Data Link Connector (DLC) Under Left Side Of Instrument Panel
Distributor Top Of Engine, Near Bulkhead
EGR Valve Left Center Of Engine, Above Valve Cover
Engine Coolant Temperature (ECT) Sensor On Left Cylinder Head, Near No. 1 Spark Plug
EVAP Canister Purge Solenoid Right Center On Intake Manifold, Near MAP Sensor
EVAP Canister Vent Near Master Cylinder, At Left Front Wheelwell
EVAP Purge Solenoid Vacuum Switch Right Rear Top Of Engine, Right Of Purge Solenoid
Fuel Injectors On Intake Manifold
Fuel Pump Oil Pressure Switch Rear Center Of Engine, Behind Distributor
Fuel Pump Prime Connector At Instrument Panel Harness, Near Instrument Panel Fuse Box
Fuel Pump Relay In Power Distribution Box
Fuel Tank Pressure Sensor In Fuel Tank
Heater & A/C Control Module Center Of Instrument Panel, At Heater Control
Idle Air Control (IAC) Valve Right Rear Of Throttle Body
Ignition Coil Right Rear Of Engine
Ignition Control Module Right Rear Of Engine
Intake Air Temperature (IAT) Sensor On Air Intake Duct
Knock Sensor Right Side Of Engine, Below Exhaust Manifold, Forward Of Starter
Manifold Absolute Pressure (MAP) Sensor Top Center Of Intake Manifold, Near Fuel Injectors
Mass Airflow (MAF) Sensor On Air Intake Duct, Near Air Filter
Oxygen Sensors In Exhaust Pipe, At Front & Rear Of Catalytic Converter
Power Distribution Box Left Rear Of Engine Compartment, On Wheelwell
Power Steering Control Module Under Center Of Instrument Panel
Throttle Position (TP) Sensor On Side Of Throttle Body
Transfer Case Relay Right Rear Of Engine Compartment, Near Center Of Cowl
Vehicle Control Module (VCM) In Engine Compartment, Near Master Cylinder, At Left Front Wheelwell
Vehicle Speed Sensor Left Rear Side Of Transmission, (Left Side Of Transfer Case On Vehicles With 4WD)