hi im new my name is tony gorrell im 59 years old i have a 2007 hummer h3 i need to know how to replace the heater core.

[tony gorrell]

hi im new my name is tony gorrell im 59 years old i have a 2007 hummer h3 i need to know how to replace the heater core.

 

[alrock]

Welcome Tony! I don't know how to do it but I'm sure someone will chime in soon.

 

[GMOG78]

Welcome Tony! Never replaced a heater core in a H3 but have in other vehicles. Not a fun job. Here's a video with a 2009 H3T Alpha from Paul Kelley. It will give you a good idea of what you are in for. There's also some good information at 17:30 showing the sunroof drain hoses. Good luck.

 

[alrock]

Here are some reference materials. https://schwarttzy.com/h3-hummer/#h3-hummer-manual

 

[Gunner_45]

OMG!

The engineer that designed that system needs a swift kick to the nads!

Multiple times.