Heater Core flow question...

[igasper10]

Ok, I know there has been many posts as to how to bypass your heater core. I've been told that if you're going the ball valve shut-off route, you only have to install it on (1) hose, not both going into the core. You would want to do this on the hose where the coolant flows INTO the core correct? This should be the hose that comes directly from the radiator, not the water pump right? Nothing needs to be done to the hose that goes to the water pump I assume.

ian

 

[bossvette]

when I disconnect(bypass) the heater I remove the hose barbs and put pipe plugs in the holes, it looks cleaner and I haven't had any problems.
Craig sr.

 

[igasper10]

ROUTING

So, coolant flow is FROM the hose going to the radiator, OUT to the water pump?

 

[JohnZ]

Coolant flows from the intake manifold fitting through the 5/8" hose to the lower heater core nipple, and back to the water pump through the 3/4" hose from the upper heater core nipple. A valve in the 5/8" hose won't de-pressurize the heater core, but it will stop the flow. Both hoses must be removed from the core nipples in order to de-pressurize it. Hint: Use a box knife and slit the hoses at the core nipples, then "peel" them carefully off the nipples - don't just try to "pull" them off, or you'll probably damage the heater core solder joints, and fixing that is a real PITA.

 

[igasper10]

THANX

Thanx JohnZ