Picky, Picky. It is hooked up directly behind the thermostat on the intake manifold. Now, is that better.

 

No, that's not better at all. Nowhere in this thread did I ask which hose went to which side of the heater core. What I asked was which hose is pushing water into the core. Here, I'll make it easy for you. Pick a letter - A or B:

A - the hose connected to the intake is pushing water into the heater core and the hose connected to the water pump is the return hose.

B - the hose connected to the water pump is pushing water into the heater core and the hose connected to the intake is the return hose.

 

How about C - none of the above if you put that stupid valve in the line - either side. That poor little old heater acts as an auxillaryradiator, especially on a hot day.
So back to basics - I stated - 'The most logical is from the water outlet to the bottom fitting and the top fitting to the intake manifold'. From in 'Websters' (a dictionary of some renown) would imply direction, and direction would imply pressure. You might also find pressure to imply pushing, you would, I wouldn't.
Jim

 

A little condescending attitude there Donald. We are all adults here. The question has already been answered for you. Bottom line: It really doesn't matter. You are going to have hot water flow through your radiator no matter which one pushes and which one pulls.

 

Am I reading something wrong, or do these two answers contradict each other?

 

My goal is to stop water from flowing through the heater core. That's why there's a valve in one of the lines. The valve is a factory original part of my A/C system, not some "stupid" addition. All I'm trying to do is get the valve into the correct hose. Why has it turned into such a "condescending" thread?

And before you say so - I know how the heater box works. I know there's a flap that closes so only the A/C evaporator has air blowing over it. But if hot water is traveling through the heater core, heat will radiate inside the heater box, thus diminishing the cooling capability of the A/C.

If the valve is in the return line, but working, water will not flow. However, the water that's sitting in the core will be hot. If the valve is in the inbound line, no water will be in the core.

My A/C guy told me the valve is on the wrong side. So I decided to ask on this forum. So far, two different people on this thread have given me two different answers.

 

1. Do you consider yourself as not being condescending because you added a smiley face? If so, here you go......
"all this theoretical crap" "Picky, Picky"
I've told you before - your smart-alec comments to a legitimate question are neither welcomed nor appreciated.

2. Yes, the question has been answered - twice - one said "A" and the other said "B". There are only two possible answers.

3. Bottom line: it DOES matter if the goal is to keep water out of the heater core.

 

Wow, a new heattransfer theory. No matter on which hose you place the valve, hot water will not flow. To getheat to the heater core thru the hoses, two of three methods of heat transferance are employed - conduction thru the water being the first. To transfer heat from the core, a second method is used -radiation. The third method of heat transfer, convection, does not apply. So simply stated, no flow - no conduction, no conduction - no radiation, no radiation - no heat. Yes, you will get some heat transfer by conduction if a valve shuts off the flow, but that will happen in either direction, and will be minor.
Now, that being said - a correction. Hot water comes out of the intake manifold and goes into the bottom fitting of the heater core. The top fitting goes to the water pump on all engines. On a side by side heater core, the left fitting is the return. Ford put a valve on the input side.
Upon this subject, I will make no further comment - except with a glass of wine in hand.
Jim

 

ok, here's my take on it.

the radiator and the heater and the block all form part of a closed loop system with a given volume offluid (water or coolant) in the system, assuming no leaks.

the reason Glen, Jim and others (myself included) are suggesting it does not matter is because the valve will onlystop flow of engine heated water from the output side, through the heater core and back to the input side, whichever it is. it makes no difference where in the line the valve is fitted.

there will always be water in the heater core. closing the valve doesnt take the water away. if it did, you'd have to replace it with air or the hose would collapse from the negative pressure created. And ifyou could replace it with air,you'd have constantly changing fluid levels in your radiator and it wouldnt be a closed system.

so there will always be some transfer of heat via the heater core, but as water is not a particularly good conductor of heat, the transfer is less than if the hot water was flowing. hope this helps!

 

Back off Donald. You are obviously not understanding the conversation here. You want to keep water in your heater core. So, therefore you want the hoses connected, but it really doesn't matter how they are connected. You have been shown how the factory connects them. What you don't want is for hot water to run through your heater core during the summer when you have the Air Con on. That is controlled by the heater controls on your dash. Just shut off the the heater and you should be good to go.