Re: Coolant leak - manifold nipple
Depending on your mileage, it doesn't hurt to backflush the heater core both directions anytime you change your antifreeze or replace parts. YouTube videos show how to do it. When my heat quit working, my mechanic flushed the cooling system but when I got the truck back the heat was still just warm, not hot. The mechanic said my heater core needed to be replaced. So I decided to flush the core myself several times in both directions. The first attempt got a huge glob of rust colored "mud" out of the system. It was badly clogged. I now have extreme heat. These engines seem to be more corrosive for heater cores, water pumps and radiators. I now use an antifreeze mixture of 75%. The 50-50 mix doesn't seem strong enough.
1999 XLT, EXT. CAB , 3.O FLEX FUEL, AUTOMATIC
Completely Stock, No Mods