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Check all the wires and lines and make sure u didn't move something and check that the car is all hoked up and everything else runs then look at the engin check all wires and lines that they are hooked up correctly and go from there you might have a lose wire or a wire triped and isn't working now is all else fails then take it to a repair place and tell them what you did and whats wrong get them to toe it there if you have to maybe you just need a jump start.

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Q: You put a heater core in and now your 1990 thunderbird wont start?
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