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When the A/C works well at higher speeds but not at idle, the condenser fan is often weak or inoperative. At highway speeds, natural airflow cools the condenser, but at idle, insufficient cooling leads to warm air. Blocked heater cores affect heating, not cooling. Blower resistors control fan speeds, not cooling performance. Thermostats affect engine temperature, not A/C cooling. ASE G1 emphasizes HVAC system airflow and condenser performance as essential diagnostic areas.

The TPS signals throttle movement. If faulty, the ECM may not enrich fuel properly during acceleration, causing hesitation. Alternators, clutches, and brake fluid are unrelated. ASE G1 stresses sensor input diagnosis for performance issues.

If the battery is charged but no power reaches the system, corroded or loose battery terminals are the prime suspect. Alternators affect charging, coils affect ignition, and injectors affect fuel. ASE G1 stresses verifying basic connections in electrical troubleshooting.

If the ABS module does not detect a signal, the wheel speed sensor is likely dirty or faulty. Pads, gaskets, and alternators do not cause loss of wheel speed signals. ASE G1 requires knowledge of ABS electronics and sensor diagnostics.

Rotor warpage creates uneven contact surfaces, producing pedal pulsation. Boosters cause hard pedals, air in lines causes spongy feel, and fluid level issues trigger warning lights, not pulsation. ASE G1 emphasizes brake rotor inspection as a routine service step.