How to bypass the heater core?

Tiny
CPILCHER1
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • 174,000 MILES
Water building in passenger floorboard, want to know how to bypass heater core.
Sunday, July 23rd, 2023 AT 12:04 PM

1 Reply

Tiny
BORIS K
  • MECHANIC
  • 795 POSTS
Hello,

It is not a hard job to bypass the heater core. There are several companies which offer bypass kits. See your local auto parts store.

A good video, not vehicle specific but give good direction:
https://youtu.be/6FEsrFd1Fso
and
https://youtu.be/Vi-Kwag78F8
and
https://youtu.be/g5rMUYOpzsk

The 2 coolant hoses leading to the heater core at the firewall will need to be disconnected.
These are located under the AC pipes, see image below.
Ensure that the engine is cold before attempting the repair.

Cheers, Boris
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Monday, July 24th, 2023 AT 2:35 AM

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