Originally Posted by jferg92
That's what I looked for because I knew they were problematic. Mine was in great shape. Kinda annoyed. It may be supercharger time since my vac lines need replaced
It also acts like it only leaks once the thermostat opens up. Short trips right after cold starts it doesn't leak
If the block cavity is filling w/coolant, - usually it's either the by-pass fitting /vac cap is leaking (just before the heater core hardline ducks behind the passenger side head) or it's leaking at the double O-rings right behind the water pump.
Ford updated all that with a good fix that I haven't seen fail yet, BUT, only the reman engines received the upgraded heater core hardline. There's a picture of it in one of the Haynes or Chilton manuals....If you own one lol.
BTW, -the HCHL by-pass by the firewall is there for the trucks that have the Cold Climate system package.