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I wouldn't try. Everything behind the firewall has to be "removared". The wiring and electronics will not survive this adventure unless you have the entire GM team on your side (They are NOT!). I cut the core out of the loop by disconnecting the hoses and joining them. But I live two blocks from the Sun. If you live in the Great White North you could build a campfire in the back seat for warmth or wait a couple of thousand years until the climate changes.

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Q: How to replace heater core on 1990 DeVille?
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