My father-in-law has a 97 f150 with the 4.6 L and he has nothing but trouble with heater cores leaking the original lasted about 120000 mi. after that its been about every 4 months he has a new one put in. Coolant has been flushed recently so I think we can rule that out. I am wondering if there are cores out there that are better than the others and also if you guys have any suggestions that could help me out Thanks for the input

 

OEM.......

 

I got one from a radiator shop, that or OEM. Don't go with the autozone/big box brand. Their warranty isn't worth the amount of time it takes to pull the dash 3/4 of the way out!