Hooking up heater hoses

[daleearnhardt01]

Doing an engine swap on my Blazer, new engine has vortec heads and has a coolant nipple on the intake. Water pump has no outlet, and Im stuck with that specific kind due to the pulley setup Im running. Radiator has no aux inlet.

Any ideas on how to hook up the heater hoses without getting a new radiator?

 

[blazin_blazer]

maybe, 1 on the intake, 1 on the water pump, i'm pretty sure thats how i had mine w/vortec heads and gmpp carb intake.

edit;, reread..saw you said no nipple on water pump...and none on radiator, curious to hear answer myself now!

 

[dyeager535]

Other than doing something weird like adding a fitting inline with the radiator hoses, I don't see how you can. The "outlet" has to be dumped into low pressure, which is "after" the thermostat all the way to (and including) the water pump.

 

[NEK5]

I`m curious as to how I have to hook mine up too, with no outlet on the rad.

 

[dyeager535]

Radiator is actually the inlet. Pressurized comes from the intake. FYI I know it doesn't help answer the question, but it helps to have the correct operation in mind when trying to come up with one.

 

[NEK5]

So, the pressure side is the back of the intake. Without the rad inlet (return), where would it go, water pump?

 

[dyeager535]

Yeah, you could try plumbing it into the water pump, although I've heard from some people that their waterpump fitting was pressurized. I tried that with mine, and no heat. Makes sense anyways, you don't want water straight from the radiator into your heater...even if it was pressurized, it would still be cooler than it could be.

When hot the whole system is pressurized of course, but the block is the "highest pressure" portion, after the waterpump and before the thermostat. The only factory locations to dump the heater outlet I've ever seen are in the pump or the radiator, and I've never actually seen one on the pump be used. It probably was, or it wouldn't be there, but in the trucks I've seen, they all go to the radiator.

 

[daleearnhardt01]

Well I guess a new radiator or getting a fitting brazed on is in order!