Heater hose flow direction

[565bbchevy]

Since there is a flow arrow on this inline valve I just bought I need to know if the smaller hose flows into the heater core.

 

[Turbolq4]

Just talking out my *ss here, kinda thinking aloud and possibly wrong too. Would make sense to me that the larger hose is going to the heater core while the smaller is headed back to the engine. Heat causing expansion and all.

We now return to your regularly scheduled programming...

 

[pontiacgp]

small hose is the pressure side, large is the return

on the right it's the pressure side, left is return

 

[Turbolq4]

See, I was wrong.

 

[pontiacgp]

See, I was wrong.

is this new world no one is never wrong.....

 

[Turbolq4]

is this new world no one is never wrong.....

One time I thought I was wrong but I was mistaken.

 

[69hurstolds]

One time I thought I was wrong but I was mistaken.

Now, that's twice! haha

As far as flow......intake manifold connection flows toward the heater core. Heater core flows to the water pump.

 

[fleming442]

Still not convinced it matters.....

 

[69hurstolds]

Still not convinced it matters.....

It probably doesn't since it's a butterfly valve. Unless it has a check valve in it. But you must do what the arrow tells you to do...or you will die.