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ase_master327
ase_master327, Shop Owner
Category: Chevy
Satisfied Customers: 5288
Experience:  +15 years experience with Chevrolet. Bumper to bumper diagnosis & repair.
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How do you change out a heater core in a 2003 chevy silverado

Customer Question

How do you change out a heater core in a 2003 chevy silverado
Submitted: 9 years ago.
Category: Chevy
Expert:  ase_master327 replied 9 years ago.
OK, this involved evacuating the air conditioning system. This is quite a lengthy job, as you can see from the labor chart.. depending on which accessories you have, and if you charge the AC back, etc..
graphic

Here is how to get the box out.

There are 2 different designs of the box, though, when it comes to the heater core..

Here is how to get the heater core out of the box (Delphi)

Here is the other one (Visteon).
Customer: replied 9 years ago.
Mine is v6 not a V8
Expert:  ase_master327 replied 9 years ago.
Same thing on the heater core.. Only difference is the engine, which has nothing to do with the heater core.

The only thing that would make a difference is the design of the case, which I have included both sets of instructions for you.