Heater hose routing?

[McWillies]

I disconnected the two heater hoses and didn't mark which one went where... I'm dumb. The one off the water pump goes to which side? One off the intake manifold goes to which side? Thanks.

 

[RonD]

It doesn't matter, in fact, you should reverse these every 2 years to reverse flow thru heater core to make it last longer
On ANY vehicle


Just FYI
Coolant has anti-corrosive chemicals that can only work if they can constantly circulate to protect metal parts
If a tube in the heater core(or radiator) gets blocked then no protection and it can rust thru and leak
By reversing the flow you may be able to push the blockage out of the way, called "back flushing"
Too bad we can't do this with radiators while we drive, lol

 

[McWillies]

It doesn't matter, in fact, you should reverse these every 2 years to reverse flow thru heater core to make it last longer
On ANY vehicle


Just FYI
Coolant has anti-corrosive chemicals that can only work if they can constantly circulate to protect metal parts
If a tube in the heater core(or radiator) gets blocked then no protection and it can rust thru and leak
By reversing the flow you may be able to push the blockage out of the way, called "back flushing"
Too bad we can't do this with radiators while we drive, lol

Very interesting Ron... I actually never thought about it that way. I appreciate the help sir.