Heater core flow direction

[SnowDrifter]

Well... there are 2 hoses coming out of the engine. Anyone know which hose is heater-out and which is return to block? And perhaps size if you have it handy. But really... I just need to know which one's the return on the block. Little difficult to tell at a glance.

Going to install a circulating block heater/prewarmer and flow direction's a bit important for this one!

 

[gooffeyguy]

On the heater core ports, the one closer to fender is the input and the one closer to engine is the output. Hope this helps

 

[SnowDrifter]

On the heater core ports, the one closer to fender is the input and the one closer to engine is the output. Hope this helps

Confirming that fender-side flow is from engine->heater core?

 

[gooffeyguy]

And if I remember correctly, coming off the rear most port on the pump goes to heater core input. The next forward port on the pump gets Y'd with one part going to lower port of overflow tank and other part going to heater core output

 

[SnowDrifter]

Nice thanks!

 

[SnowDrifter]

With that key-worded piece of info, I've found a rather useful diagram! Might be a couple differences (extra bits) because this one's for an LS, but this should have it all.