Q: How to remove the heater core on 1999 Mercury Grand Marquis

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What needs done to remove the heater core from my car. It needs replacement and need to expert way to get at it.
(1) Answer
This is a really involved job, including removing the seats, carpet, steering column and much more.
I can't possibly address this here. I can recommend a couple of websites that could help you if you want to find out what you're in for.
For AllData:
Here's the one for Mitchell as well:
If you want to find a speciaolist, here's a directory link for you: