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Alex
Alex, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1161
Experience:  ASE Certified Master Technician, L1 Advanced Level Specialist
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2003 Chevy S10: I replaced the heater core and radiator..heater hoses

Customer Question

Ok I have a 2003 Chevy S10 I replaced the heater core and radiator, but still no heat, both heater hoses are hot, but still no heat?
Submitted: 6 years ago.
Category: Chevy
Expert:  Alex replied 6 years ago.
Hello,

Is the blower working but only blowing cold air?
Customer: replied 6 years ago.
Blower is blowing cold are
Expert:  Alex replied 6 years ago.
Because both heater hoses are hot we know you are getting coolant flow through the heater core. The most likely problem is with the blend door actuator. If the blend door actuator is faulty, it will not direct airflow through the heater core. Another known problem on these vehicles is the blend door itself can come off. I would inspect the blend door and also inspect the wiring, electrical connector, and vacuum hose going to the blend door actuator. If everything else is ok, replace the blend door actuator.
Expert:  Alex replied 6 years ago.
Here's the procedure:

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.
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Disconnect the electrical connector (2).

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  1. Remove the air temperature actuator retaining screws.
  2. Remove the air temperature actuator from the HVAC module.
INSTALLATION PROCEDURE


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  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) .



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  1. Connect the electrical connector (2).
  2. Install the instrument panel carrier.