so hi every body first off im from quebec so sorry for my english !

i have a 350 TPI in my fiero and install a electric pump in the quarter panel and i let the OEM tubing under the fiero and i didnt plug the outlet/inlet of the heater radiator . the one connect to the OEM tubin under passenger side is still connect but the other hose is not connect and i am wondering where is suppose tu be i try to draw a litle plan of my system !

hope you guys can understand and help me out !!!

We don't know what exact year of engine or intake manifold style you have.
Generally, there should be a connection on the intake manifold near the thermostat housing for the heater hose TO the heater core.

I found this diagram for a TPI engines, and the hose connection seems to be directly under the throttle body.




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[This message has been edited by fierosound (edited 10-10-2020).]

that would make sense because this hose is block since i bought the car so maybe is the answer !

Wrong connection. I think that's air to valve cover for PCV system.
https://www.thirdgen.org/fo...i-owners-i-need.html



The Throttle Body has coolant running through it so it doesn't freeze in winter conditions.
It is unnecessary in summer and if you never drive in winter.

In a normal system, coolant OUT to heater core would be connection "2".
If you want to bypass Throttle Body heating, connect hose to heater core to connection "1" (remove U-shape hose)




This guy has flow direction backwards when he explains it, but it shows the connections.

[This message has been edited by fierosound (edited 10-11-2020).]