whats the procedure to replace a heater core
how to replace heater core on 1991 Ford F-150
91 f150 take out glove box door remove about 8 screws there it is 25 min job
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You should invest in a repair manual. Try a local parts store, or even better is an online subscription to alldatadiy.com. They will have so much more than a repair manual book, and you can get it in minutes.