I am about to change out my heater core on my 04 Blazer,is there any advice anyone can give that will help? I do understand that it's a lot of work. Do I really need to take out my whole dashboard?


Asked by May 24, 2015 at 08:50 AM about the 2004 Chevrolet Blazer LS 2-Door 4WD

Question type: Maintenance & Repair

2004 Chevy Blazer LS 2dr 4x4 V6 4.3

3 Answers


First thing to always do is disconnect the negative (-) battery cable. You'll need to remove the lower dash panels on both sides and the entire center console assembly, if equipped. I'd suggest visiting your local auto parts store and get a Haynes or Chilton's repair manual. The manual will give you step by step instructions plus pictures. You can also watch a youtube video on it as well. Have some towels handy as some coolant will spill out of the old heater core when you remove it. HTH. -Jim

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Thank you. I also heard that I need to unhook the fuses on the drivers side area. Is this correct?

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Since your disconnecting the battery, no need to remove the fuses, but if you have to remove the fuse assembly to get to the heater core, possibly, I'd watch the video.

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