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 MANUALSCHEVROLET2000K TAHOE 4WD V8-5.3L VIN TREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGBLOWER MOTORDESCRIPTION AND OPERATIONHVAC SYSTEM - AUTOMATIC
2000 Chevrolet K Tahoe 4WD V8-5.3L VIN T
HVAC System - Automatic
2000 Chevrolet K Tahoe 4WD V8-5.3L VIN TSECTION HVAC System - Automatic
The Electronic Climate Control (ECC) modules (front and rear) serves as an interface between the passenger and the blower motor. System voltage is supplied to the ECC modules by the following sources:
- Continuous battery voltage source:
- RADIO fuse (front module)
- CKT 340 (ORN)
- Interrupted battery voltage source:
- Ignition switch
- HVAC I fuse (front module)
- IGN 3 fuse (rear module)
The ground path is provided to grounds G200/G410. The ECC modules determines the appropriate blower motor speed and sends a Pulse Width Modulated (PWM) signal to the blower motor. The ECC module may produce the blower motor speed signal in two modes of operation:
- Automatic operation
- Manual operation
In the manual operation mode 13 speed settings are available and, once selected, the fan speed remains constant until a new speed is selected. In the automatic operation mode the ECC module will determine what blower speed is necessary in order to maintain customer selected temperature.
- Continuous battery voltage source:
- RADIO fuse (front module)
- CKT 340 (ORN)
- Interrupted battery voltage source:
- Ignition switch
- HVAC I fuse (front module)
- IGN 3 fuse (rear module)
The ground path is provided to grounds G200/G410. The ECC modules determines the appropriate blower motor speed and sends a Pulse Width Modulated (PWM) signal to the blower motor. The ECC module may produce the blower motor speed signal in two modes of operation:
- Automatic operation
- Manual operation
In the manual operation mode 13 speed settings are available and, once selected, the fan speed remains constant until a new speed is selected. In the automatic operation mode the ECC module will determine what blower speed is necessary in order to maintain customer selected temperature.
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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.