/C Evaporator Temperature Regulator On left side of heater/evaporator housing. A/C-Heater Blower Motor Resistors On right side of evaporator housing. Alarm Horn Behind battery. Auxiliary Fan Normal Speed Resistor On fan shield, ahead of radiator. Cruise Control Actuator On left front wheelwell, just forward of main fuse/relay box. Diagnostic Connector (528e) On intake manifold. Diagnostic Connector (535i) On top, front of engine. Filter Capacitor Behind battery. Main Fuse/Relay Box On left front wheelwell. Heater Blower Motor Resistor Below heater motor cover. Heater Regulator Behind A/C selector switch. Heater Water Shutoff Valve (528e) Below brake master cylinder. Heater Water Shutoff Valve (535i) At center rear of engine compartment. Idle Speed Control Valve On top right rear side of intake manifold. Lock Heater In left front door. On-Board Computer Alarm Horn Behind battery. On-Board Computer Filter Capacitor Behind battery. On-Board Computer Relay Box Mounted on left under dash cover. Power Window Circuit Breaker Under left side of dash. Purge Valve Behind right side headlights.

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.

Safety Warning

Miscellaneous Components

Use the Manual With the Right Hardware

When to See a Mechanic