Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Geo Tracker L4-1590cc 1.6LFACTORY OEM SERVICE PROCEDURE
Text Description
A/C Amplifier: Behind Instrument Panel, On Evaporator
Backup Lamp Switch: Top Of Transfer Case
Blower Motor: Behind RH Instrument Panel
Charcoal Canister: RH Front Of Engine Compartment
Clutch Start Switch: Under Instrument Panel, Above Clutch Pedal
Combination Switch: RH Side Of Steering Column
Control Relay: Under LH Side Of Instrument Panel
Coolant Temperature Sending Switch: In Thermostat Housing
Coolant Temperature Switch: RH Side Of Engine
Defogger Switch: Left Of Steering Column
ECM: Under LH Side Of Instrument Panel
EGR Modulator: RH Side Of Engine
EGR Valve: RH Side Of Engine
Fuel Filter: Under RH Rear Of Vehicle
Fuel Pressure Regulator: Front Of Engine
Fuel Pump: In Fuel Tank
Fusible Link Box: RH Inner Fender
Fuse Box: Under LH Side Of Instrument Panel
Horn Relay: Mounted To ECM
Idle Speed Control Solenoid Valve: RH Side Of Throttle Body
Ignition Coil: LH Side Of Cowl
Ignition Switch: RH Side Of Steering Column
Inlet Air Temperature Sensor: RH Side Of Engine
ISC Solenoid: RH Side Of Engine
Main Switch: RH Rear Corner Of Engine Compartment
Manifold Air Temperature (MAT) Sensor: Below Throttle Body
Manifold Absolute Pressure (MAP) Sensor: Rear Engine Compartment Near Bulkhead
Noise Suppressor Condenser: Below Ignition Coil
Oxygen Sensor: In Exhaust Manifold
Power Steering Pressure Switch: In Power Steering Pump
Pressure Limit Valve: Near Strut Tower
Pressure Sensor: Mounted To RH Side Of Cowl
PTC Heater Relay (Automatic Transmission): RH Side Of Engine Compartment Recirculated Exhaust Gas Temperature
Sensor: RH Side Of Engine
Rear Wheel Anti-Lock Brake Controller: Near Fuse Block
Shift Lock Relay: Above Brake Pedal
Shift Switch (Automatic Transmission): RH Side Of Transmission
Stoplamp Switch: Under Instrument Panel, Above Brake Pedal
Throttle Opener Vacuum Switching Valve: Front Of Engine
Throttle Position Sensor: Front Of Throttle Body
Turn Relay: Under Instrument Panel, Mounted To ECM
Vacuum Switching Valve: RH Side Of Engine
Washer Pump Assembly: Mounted To Windshield Wiper Reservoir
Water Temperature Gauge: RH Front Of Engine
4WD Switch: Top Of Transmission
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.