Can someone tell me what this line is for?

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WisconsinCutlass

WisconsinCutlass

Greasemonkey
May 28, 2014
193
28
It's been awhile since I've posted but still been lurking occasionally. I finally got some ambition to work on the car and was kind of stumped by this. The engine is a 72 olds 350 and the heat and AC are bypassed. The line I'm questioning runs from the back of the intake to the small fitting on the water pump. I always thought the small fitting on the water pump went to the heater core so it would always be flowing coolant for the heater (not going through the thermostat)? I'm wondering if I need this line still or If I could plug the back of the intake and cap the small fitting on the water pump?
 

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TURNA

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
11,011
113
Socialist NY
coolant bypass hose

I would think a cap with a clamp would leak eventually
 
69hurstolds

69hurstolds

Comic Book Super Hero
Supporting Member
Jan 2, 2006
3,980
113
Someone made a bypass for your heater core. The pressurized water flows out of the back port of the intake and would normally supply the heater core to the smaller 5/8" hose line. And the fitting would be normally on the passenger side, but really it doesn't matter. Out of the core, the 3/4" line would travel across to the 11 o'clock port and flow into the suction of the water pump. The radiator hose in, and the two top fittings of the water pump are suction lines. The discharges of the water pump is on either side of the block.

You could put a rubber cap and clamp it on the suction port of the pump. If you want to cap off the back of the intake, remove the hose fitting and put a plug in it like someone apparently did on the passenger side rear.

Hope that helps.
 
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