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John
John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience:  A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
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How do I replace a heater core in a 2003 impala

This answer was rated:

How do I replace a heater core in a 2003 impala

HelloCustomer

This one is not too bad,here is some info to help you.

Heater Core Replacement

Tools Required

Hose Clamp Pliers

  1. Remove the fuel injector sight shield, if equipped with 3.8L.
  2. Drain the coolant. .
    Object Number: 415886  Size: SH

  3. Use hose clamp pliers in order to position aside the heater hose inlet and outlet clamp at the heater core.
  4. Disconnect the inlet and outlet heater hose from the heater core.
  5. Remove the vacuum tank. Remove the floor carpet.
  6. Remove the rear floor air outlet duct from the holes in the floor reinforcement.
  7. Disconnect the rear floor air outlet duct from the heater core outlet cover.
  8. Remove the bolts from the vacuum harness bracket and position bracket aside.
    Object Number: 508311  Size: SH

    Important: Position the heater outlet cover downward and rearward in order to disconnect the cover from the rear area floor duct assembly.

  9. Remove the heater outlet cover screws.
  10. Remove the heater outlet cover.
    Object Number: 295349  Size: SH

  11. Remove the heater core cover screws.
  12. Remove the heater core cover.
    Object Number: 143978  Size: SH

  13. Remove the heater core cover.
  14. Remove the caulk (3) from the heater core outlet cover.
    Object Number: 296242  Size: SH


Object Number: 295351  Size: SH

  1. Remove the heater core pipe retainer clamp screw (2) from the heater core retainer clamp.
  2. Remove the heater core retaining clamp screw (1) from the heater core.
  3. Remove the retaining clamp from the heater core.
    Object Number: 295353  Size: SH

  4. Remove the heater core from the HVAC lower case.
  5. Remove the heater core pipe retainer clamp from the heater core pipes.
    Object Number: 143987  Size: SH


Object Number: 143992  Size: SH

Check seals
Object Number: 143985  Size: SH
Check seals before reinstalling.


Object Number: 143990  Size: SH

Check seals before reinstalling.

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