Hi,
|I wanted to add a few additional thoughts. If you are not getting heat, pay attention to the temperature gauge in the vehicle. When it gets cold, a faulty thermostat can prevent the engine from reaching operating temperature. If that is the case, you won't get heat. IF you find it isn't warming up, here is a link that shows in general how it's done:
https://www.2carpros.com/articles/replace-thermostat
Next, if it is warming up properly, try this. Start the engine and allow it to reach operating temperature. While it warms up, make sure the heater is on high. Once temp is reached, feel both heater core hoses under the hood. They will run to the firewall. If you look at pic 1, I highlighted what to look for. One is a supply and the other a return. Both should be hot.
If you find one is hot and not the other, the heater core is plugged. Here is a link that explains how to flush a cooling system. You will need to remove the two hoses first. Then, using a garden hose, flush one direction and then backflush the opposite way until the water flows clean.
Now, if both hoses are hot, then heat is in the vehicle. The blend air door is likely the concern. The blend door is responsible for the air temp entering the cab. Here is a link that shows in general how one is replaced:
https://www.2carpros.com/articles/replace-blend-door-motor
Here are the directions specific to your vehicle. The attached pics correlate with the directions.
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2003 Chevy Truck S10/T10 P/U 4WD V6-4.3L VIN X
Air Temperature Actuator
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Procedures HVAC System - Manual Air Temperature Actuator
AIR TEMPERATURE ACTUATOR
AIR TEMPERATURE ACTUATOR REPLACEMENT
REMOVAL PROCEDURE
The air temperature actuator is located on the top right hand side of the HVAC module.
1. Remove the instrument panel carrier.
Pic 2
2. Disconnect the electrical connector (2).
pic 3
3. Remove the air temperature actuator retaining screws.
4. Remove the air temperature actuator from the HVAC module.
INSTALLATION PROCEDURE
pic 4
1. Install the air temperature actuator to the HVAC module. Ensure that the actuator is seated on the locating tab.
2. Install the air temperature actuator retaining screws.
NOTE: Refer to Fastener Notice in Service Precautions.
Tighten
Tighten the screws to 1.9 N.m (17 lb ft).
pic 5
3. Connect the electrical connector (2).
4. Install the instrument panel carrier.
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I hope this helps. Let me know if you have other questions.
Take care and God Bless,
Joe
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Friday, February 19th, 2021 AT 8:21 PM