I am needing to hook up my Vintage Air system to to my 5.3 & have to determine which water pump heater hose outlet does the water flow out of? I have searched this forum, but no luck. Can anybody provide this info?
Thanks

 

Not sure which is which, but....

They're 2 different sizes. 1 is sized for 5/8" hose, other is for 3/4". Heater cores are usually set up the same way (1 5/8", 1 3/4"). Plumb them together (5/8 to 5/8, 3/4 to 3/4) and you should be good.

If your heater core isn't like that, then you'll need more advice.

'JustDreamin'

 

5/8 would be the hot side (out on the water pump), and 3/4 (in on the water pump) would be the cold side.

Andy1

 

out on the waterpump is the one towards the back...

in would be the one towards the front.

 

thanks guys, the back one is the smaller so both answers jive. Now I gotta cram my head back under the dash to see which hose is feeding the shut off valve. (I forgot) gettin older sucks..