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Heater core should be behind glove box. Remove glove box and screws( approx. 8) that holds cover in place. Pop hood and look for two hot water lines running into firewall at that location(passenger side) Remove lines by loosening hose clamps(advisable to replace) Remove heater core from inside and replace.

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โˆ™ 2015-07-15 19:58:53
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Q: How do you replace the heater core on a 86 F-250?
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