I bought a used w.p. housing that was already set up for an electric water pump and never looked at it...now that its on the car ive noticed that 3 of the holes have been blocked off. 2 of them arefor the heater core(no biggie i just ziptied those 2 hoses out of the way), and a third runs from the drivers side bottom of the radiator to the pump...this one's a small diameter(like the heater hoses) so i plugged it and ziptied it out of the way.

now i have 2 large radiator hoses going to my water pump. Im curious what the purpose is of that third small diameter hose is??? because if i dont need it ill plug the hose up at the radiator and fuhghedaboutit...but if its important than i need to probably pick up a new housing.

as of now the t-stat was not opening so i ripped it out to await the new one from summit, which should get here tomorrow...could that third hose have something to do with opening the stat up?

 

Just to be clear, all i need to know is the purpose of that extra small diameter hose

 

3rd hose is called 'bypass hose' ... it's for the oil cooler if you have one.. if not, it's just a hose from the WP to radiator..
And yes, you can block it off with no problem..
Vette's and B body WP's don't have it..