Reinstalling heater hoses.

[tbone722]

Trying to reinstall heater hoses after a decade of no heater. I am wondering what this elbow is for? I thought the main outlet was for water but it appears to have vacuum ports on the end. One is capped and the other runs to the back of the manifold. 302 with an Edelbrock performer rpm intake. Thanks!

 

[omureebe]

That's weird. You certainly have the heater core delete thing going on but that tee has to be plugged up. Where does that one line go? I'd think remove the whole thing and get https://www.summitracing.com/parts/ado-15-31770 or something like that from Amazon.

 

[tbone722]

It goes to a vacuum tree in the back of the manifold. I can't imagine we would have added the piece, so I'm curious if it was from the original intake? I am wanting to go the route your suggesting but wanted to make sure no one knew of a reason to keep it.

 

[Broncomt]

Trying to reinstall heater hoses after a decade of no heater. I am wondering what this elbow is for? I thought the main outlet was for water but it appears to have vacuum ports on the end. One is capped and the other runs to the back of the manifold. 302 with an Edelbrock performer rpm intake. Thanks!

Temperature controlled vacuum. My 91 stang 302 has it and goes to the distributor advance.

 

[AC932]

What they said. The outlet of the elbow (on top) goes to your heater. That little thing in the side port is a temperature vacuum switch. On 74, at least, that turned off EGR when the engine wasn't warmed up. You can just remove the vacuum lines and let it sit there, won't hurt anything.

 

[jckkys]

Get rid of that heater hose elbow with the ported vacuum switch. Then get s simple one. Here;https://www.wildhorses4x4.com/product/Water_Inlet_Elbow/Bronco_Heater_Parts. The ported vacuum switch was likely used for the EGR valve that's no longer there. As it is, the vacuum switch will just create a vacuum leak. Did you buy the Bronco in it's present state? I would suggest looking at a 1974 Ford truck shop manual on line to see the routing of the heater hoses and where the cable controlled valve goes. You need that to avoid having full heat all the time. You also have to test the heater core for leaks. New hoses may just end up leaking on the pass. side floor. A bad heater core is likely why the hoses aren't connected to the heater.