engine cooling question Options

[match220]

on the heater system, which side is the send and which side is the return? What I mean is which side is the engine pumping into the heater core and which side is the return back into the engine? All hoses are disconnected and I have a different engine in the car now so I can't look at where the hose is going. I would guess that the heater control valve would shut off the water pumping in from the engine and the return would be on the other side. Neither the Chiltons nor the Haynes manuals have a cooling flow diagram. Thanks!

[xrav22]

on the heater system, which side is the send and which side is the return? What I mean is which side is the engine pumping into the heater core and which side is the return back into the engine? All hoses are disconnected and I have a different engine in the car now so I can't look at where the hose is going. I would guess that the heater control valve would shut off the water pumping in from the engine and the return would be on the other side. Neither the Chiltons nor the Haynes manuals have a cooling flow diagram. Thanks!

I can tell you on my 2.2 the upper one or drivers(valved) goes to the top of the engine that would have to be return line on my 2.2l.
The lower left one goes to the engine metal tube because that one dribbles a little on me and I have to tighten it once in a while.

[RobbMeeX]

on the heater system, which side is the send and which side is the return? What I mean is which side is the engine pumping into the heater core and which side is the return back into the engine? All hoses are disconnected and I have a different engine in the car now so I can't look at where the hose is going. I would guess that the heater control valve would shut off the water pumping in from the engine and the return would be on the other side. Neither the Chiltons nor the Haynes manuals have a cooling flow diagram. Thanks!

^that. Doesn't really matter as long as its all flowing.

[azian_advanced]

the hose leading to the heater control valve from the engine is going into the heater core.

[Bitter]

It does matter, system is designed to push the coolant in a certain direction and pull it back the other way. Reversing that flow can make it that much harder to get air out, cause poor heater performance due to low flow, or even (if one side has a restriction) erode the heater core and cause a leak.

[RobbMeeX]

It does matter, system is designed to push the coolant in a certain direction and pull it back the other way. Reversing that flow can make it that much harder to get air out, cause poor heater performance due to low flow, or even (if one side has a restriction) erode the heater core and cause a leak.

We're not talking about spinning the water pump backwards... The only difference is the core in/out. AND if you do have a restriction, that should be addressed. Anyway, the answer was given. Good luck getting the car back together.

[match220]

I can tell you on my 2.2 the upper one or drivers(valved) goes to the top of the engine that would have to be return line on my 2.2l.
The lower left one goes to the engine metal tube because that one dribbles a little on me and I have to tighten it once in a while.

thanks man, so you're saying that the hose coming off of the cooling neck (above the transmission) connects to the shut-off valve that is closer to the driverside? And the other one that is closer to the passenger side and lower connects to the metal tubing that wraps around the engine towards the waterpump?

The 5sfe and the 3sgte have the same waterpump setup, it pumps into the engine first and the two metal tubes that wrap around the engine are the return lines. So if what you are saying is correct then the water will pump through the engine and out of the coolant neck (part above the trans that is close to the distributor) into the shut-off valve side, and then return out of the other one that is closer to the passenger side, feeding into the coolant pipes to go back to the waterpump.

[xrav22]

I can tell you on my 2.2 the upper one or drivers(valved) goes to the top of the engine that would have to be return line on my 2.2l.
The lower left one goes to the engine metal tube because that one dribbles a little on me and I have to tighten it once in a while.

thanks man, so you're saying that the hose coming off of the cooling neck (above the transmission) connects to the shut-off valve that is closer to the driverside? And the other one that is closer to the passenger side and lower connects to the metal tubing that wraps around the engine towards the waterpump?

The 5sfe and the 3sgte have the same waterpump setup, it pumps into the engine first and the two metal tubes that wrap around the engine are the return lines. So if what you are saying is correct then the water will pump through the engine and out of the coolant neck (part above the trans that is close to the distributor) into the shut-off valve side, and then return out of the other one that is closer to the passenger side, feeding into the coolant pipes to go back to the waterpump.

Yes if you r looking at firewall the right upper hose goes to fronm the firewall to the valve and back to the cooling neck(where the temp sensors are) then to high pressure hose to radiator. Then it seems the water pump pulls from rediator to the tube on lower part of engine and goes into the entry on firewall(lower left if you are looking at it from front). I don't want to confuse the issue.

[Bitter]

It does matter, system is designed to push the coolant in a certain direction and pull it back the other way. Reversing that flow can make it that much harder to get air out, cause poor heater performance due to low flow, or even (if one side has a restriction) erode the heater core and cause a leak.

We're not talking about spinning the water pump backwards... The only difference is the core in/out. AND if you do have a restriction, that should be addressed. Anyway, the answer was given. Good luck getting the car back together.

Some vehicles have a restritor built into the line to limit flow, the heater control valve may perform that function on the Celica. It's not an uncommon thing. Coolant flowing too fast through a heater core can and does cause problems, countless OEM's release updated hoses WITH restrictors in them to prevent and fix that issue. It's made to flow one way with hoses cut to go to one side and the other, connect it correctly and there's not a potential problem. One less thing to worry about.

[Bitter]

It does matter, system is designed to push the coolant in a certain direction and pull it back the other way. Reversing that flow can make it that much harder to get air out, cause poor heater performance due to low flow, or even (if one side has a restriction) erode the heater core and cause a leak.

We're not talking about spinning the water pump backwards... The only difference is the core in/out. AND if you do have a restriction, that should be addressed. Anyway, the answer was given. Good luck getting the car back together.

Some vehicles have a restritor built into the line to limit flow, the heater control valve may perform that function on the Celica. It's not an uncommon thing. Coolant flowing too fast through a heater core can and does cause problems, countless OEM's release updated hoses WITH restrictors in them to prevent and fix that issue. It's made to flow one way with hoses cut to go to one side and the other, connect it correctly and there's not a potential problem. One less thing to worry about.