Heater core flow direction

[jesilvas]

I'm trying to figure out which line flows into the core and which line flows out of the heater core.
One comes out of the block to the core.
Other comes out of the core, into the water pump.
I'm assuming that it flows out of the block and then back into the pump?
Also, does the pump have any suction on it? Or is is strictly pumping out?

[jesilvas]

come on persons

[STROKED_NY_023]

Originally Posted by jesilvas

I'm trying to figure out which line flows into the core and which line flows out of the heater core.
One comes out of the block to the core.
Other comes out of the core, into the water pump.
I'm assuming that it flows out of the block and then back into the pump?
Also, does the pump have any suction on it? Or is is strictly pumping out?

Not 100% positive but I believe you are correct. The pump will have some suction, but any pump is designed to push not pull.


Sent from my Galaxy S2 while my wife is yelling at me for being on my phone...

[jesilvas]

Ok. I just am in constant need of validation haha
I'm gonna reroute my coolant filter so that instead of flowing back into the degass bottle and bypassing the thermostat when it should be closed, it will flow back into the my heater core lines, after my heater core shut off valve, and I will have constant filtration and ECT readings.

[NoRalPh]

I hate to screw you up.... and I have No Idea if this is the way it works or not,, But, my intuition would be just the opposite (again, without specific knowledge, just my "gut")

It seems to me that a water pump would not be used to "suck" the coolant from the core, but rather "push" it through. That's how I think of a centrifugal pump working, it Draws from the center and Pushes to the outside. So, just what sounds right to Me, the heater hose connection to the pump would be more likely to be on the pressure side of the pump, forcing coolant through the core and into the block...

I could be Totally Wrong though

[jesilvas]

That's what I needed actually. Two opposite answers to make me think and see the answer that was right in front of my face
The vacuum operated heater core shut off valve I got from dieselsite came with instructions. And while those are gone, I remembered the valve has a flow arrow on it lol
It points to the water pump on the hose between the core and pump . . .

My Samsung SGH-I997 made me send this.

[STROKED_NY_023]

Originally Posted by jesilvas

That's what I needed actually. Two opposite answers to make me think and see the answer that was right in front of my face
The vacuum operated heater core shut off valve I got from dieselsite came with instructions. And while those are gone, I remembered the valve has a flow arrow on it lol
It points to the water pump on the hose between the core and pump . . .

My Samsung SGH-I997 made me send this.

Yeah thats what I thought, the heater core is designed to remove heat and put it in the cab. So pulling cooled coolant through it and into the block didnt make sense to me. Hot coolant from the block passing through the HC makes alot more sense.

Sent from my Galaxy S2 while my wife is yelling at me for being on my phone...

[NoRalPh]

Well I said it was just a "gut feeling"


Glad you got it figured-out

[jesilvas]

Originally Posted by NoRalPh

Well I said it was just a "gut feeling"


Glad you got it figured-out

Lol like I said, I needed conflicting opinions to come up with something
Thank you both

My Samsung SGH-I997 made me send this.