I've searched. Most of the posts say that one coolant line goes from the TPI manifold into the heater core, then out from the heater core to the heater control valve. Then from the heater control valve to the radiator.

Which port? There's three.

I also have a Griffin radiator with no return ports on it. I heard you can route the return into the fuel pump. Is that correct?

And where does the third port on the heater control valve get connected to?

 

No, never to the fuel pump. I cant get the info for you today but will do so tomorrow if you still need it. If memory serves me right (watch out) one throttle body bypass hose connects to the heater control valve, one connects to the heater core pipe along the passenger side inner fender and the other to the radiator. You can try the 'search' function at the top of the page but I looked and could not find the info that was there a month ago.

 

I'm thinking you meant water pump, not fuel pump?

The hose from the throttle body(or manifold, if you've bypassed the throttle body) runs to the heater control valve.

Then one hose from the valve(I'm thinking the top one) runs straight to the firewall(to the heater core).

The other hose from the valve curves down to the straight pipe that runs along the fenderwell. That's the return line from the firewall(heater core) that runs to the radiator.

That's what the heater control valve does: it switches the coolant flow to run to the heater core or directly back to the radiator.

So with no radiator return ports, I'd guess you'd run that hose coming from the straight pipe along the fenderwell(that would normally be going to the radiator) directly to the top of the water pump(assuming the pump takes the flow in at that point and doesn't push it out, which I'm not really sure about). So you'd have to install a nipple in the pump.

 

i think that pumps out. you think for what you pay for those they would have provisions for that.

 

Yeah, I meant water pump. I must've been tired.

Another member is going to let me look at his car tomorrow. Hopefully I can figure it out off of that.

I've tried the search function. Every diagram doesn't even have the control valve in it, and the one photo I found has it upside down and the photo is so small I can't tell where the lines go.

 

The only thing I said that I'm not sure about is that water pump port at the top of the pump, whether it takes water in or pumps it out. Everything else I said about the hoses and valve are correct. Before removing the entire heat and air systems from my Formula, I physically(no books or diagrams) traced the flow to be sure I wasn't cutting off the water circulation.

I'd like to say that is a return port and that the pump only pumps out into the block itself. And if that's the case, then that's where you'd route that hose from the straight pipe along the fenderwell, because that's the one that would normally be returning to the radiator. And since some radiators, like yours, don't have return ports, there'd have to be a way to return the water from the heater core. But then again, if it's a "race" radiator, they prolly figure you aren't worrying about a heater set-up.

But on the otherhand, based on pix I've seen from the early days of, and before, a heater control valve, it looked like that port ran water directly to the heater core, meaning it would pump out. So if that's the case, then you're gonna have to "invent" a way to return the water from that hose to the radiator, water pump, intake manifold or block so it can continue to circulate.

 

Ok, I just did some searching of the Q&A forums on the Stewart website, and the port of the top of the pump is, in fact, a "coolant return" port.

So there ya go. That's where you'd connect the heater core return hose that would normally connect to the radiator.

But good luck finding a path from the firewall to the water pump, or from the metal pipe(along the fenderwell) to the water pump. That should be quite an adventure!

 

Thanks.

I totally forgot about the hardline that was down there. Plus I also had the oil cooler option (took that off awhile ago.) I'll have to search for the hardline but I'll probably just end up using heater lines all around.