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.
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HOMESERVICE MANUALSCHEVROLET1999ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCONTROL ASSEMBLYDESCRIPTION AND OPERATIONHVAC SYSTEM - MANUALMODE CONTROLS
1999 Chevrolet Astro Van 2WD V6-4.3L VIN W
Mode Controls
1999 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Mode Controls
Temperature Control Motor Circuit Description
The temperature control motor is powered from the CKT 141 (BRN) cavity 10. The rotation of the temperature control motor moves a wiper contact along the resistance body. The rotation varies the voltage which is passed through the CKT 733 (LT BLU) to the temperature control motor. The temperature control motor senses the voltage provided at CKT 733 (LT BLU) cavity 8. Rotating the temperature control knob to one direction signals the temperature control module to command the motor to rotate proportionally to the correct voltage. Full voltage is a full rotation in one direction. A very low voltage is a full rotation in the opposite direction.
The temperature control motor is powered from the CKT 141 (BRN) cavity 10. The rotation of the temperature control motor moves a wiper contact along the resistance body. The rotation varies the voltage which is passed through the CKT 733 (LT BLU) to the temperature control motor. The temperature control motor senses the voltage provided at CKT 733 (LT BLU) cavity 8. Rotating the temperature control knob to one direction signals the temperature control module to command the motor to rotate proportionally to the correct voltage. Full voltage is a full rotation in one direction. A very low voltage is a full rotation in the opposite direction.
RENDER: 1.0x
NO RELATED
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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.