I have no experience with heater cores but myself and a couple of friends just installed this product on their 2002 Tacoma V6. Not easy, but doable for beginners. Removed the dash, then went to the heater core, removed it and put a new one in and put the dash back in as well. The heat is very hot and almost burns your hands! It's 90 degrees here, high humidity and the heat from the car is hotter than outside! Great product and would definitely recommend.
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