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Does it matter to which side of heater core hose is attached?

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Frankb

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I know that the hose from forward water pump fitting is supposed to go to drivers side at heater but that would require me to route hose under or over the other hose. I don't want to do that. I think it looks better with hoses parallel, not twisted. 68 Charger, big block, non A/C. Any issues?
Frank
 
Yes there will be issues. They are crossed from the factory near the alternator.
 
images?q=tbn:ANd9GcTvaMoWzDtHo6-cvqY54dBo1oXkeVK5jms7Fg&usqp=CAU.jpg
Those crossed hoses look allright to me !
 
We debated this on a thread about six months ago with about a 50/50 split - possibly a slight majority leaning towards they do not cross. I went through a lot of old magazine road test photographs in reprints and older Musclecar Magazine photographs of low mileage, original cars at the time. Some of the photos have been reproduced so much that details on the heater hoses near the front get blurred. But in general I found both cases in the photographs with slightly more showing they were not crossed.than were crossed. But I did find some examples of cars with the heater hoses crossed. So apparently it varied on different assembly lines or maybe by different assembly line workers, I believe Fran pointed out that crossing them may help purge the heater coil of trapped air. But apparently other than that, it makes no real difference if crossed or not.

I’ll try to find the earlier thread later if someone else doesn’t link it first.
 
I may be reading your question differently than others but typically you want the inlet/ feed on the bottom of the core so that air pockets are pushed out the top of the core.
 
can be debated forever.
I have done it both ways on a 100 cars with out a issue...as long as there is not a valve in the middle.
 
Yeah, doesn’t seem to matter. GM may have done things a bit different if my 66 Corvette is typical. They used two different sizes for the heater hoses. The large one for input and smaller one for return I assume based on hot water expansion - although it may have been the reverse based on water pump feed pressure. Never bothered to sort it out.
 
Copy all. Thanks. I am not going to cross.
Frank
 
It does make a difference how they are hooked up, at least on some cars. Back in the mid 70's, I used to change the heater box in my 68 Dart GTS on a regular basis. I couldn't afford a new heater core, but had access to several heater boxes. It was close to winter and I had just changed the box. We had snow and it turned real cold. I and several friends with me and we were going somewhere and the heater was blowing out just barely warm air. One friend asked-I told him I had just changed the heater box, no reason to get much warmer. He asked if I hooked up the hoses right, I didn't think there was a difference. We came home and i changed the hoses around and nice hot air. So-I would hook it up like the service manual says.
 
I'd have to imagine that it does matter as the flow of water run runs in a certain direction.
 
dadsbee said:
'70 has 1/2" and 5/8"... '69 back both are 5/8"
Click to expand...
Maybe from '69 back too many people made the mistake of getting the hoses on wrong. If it was becoming a problem, then in '70 Chrysler made two different hose and nipple sizes on the water pump and heater core so nobody would get it wrong. I DFK, I just guessing.:popcorn:
 
Please understand that I run my hoses crossed as in that excerpt shown above. But, if it makes a difference then Chrysler needed to do a better job of training their own assembly line workers as many of the pictures in period magazine road tests and pictures of very low mileage, unaltered originals show their hoses not crossed. From Peterson photo archives of early (1965 assembly) Hemi Coronet Coronent put together for the press and road test pool.
A2F669CC-7ECD-4C2E-BA21-E0000AC7A737.jpeg
BDE06279-D12A-4527-B2B1-5720BBFFE3B9.jpeg
 
dual fours said:
Maybe from '69 back too many people made the mistake of getting the hoses on wrong. If it was becoming a problem, then in '70 Chrysler made two different hose and nipple sizes on the water pump and heater core so nobody would get it wrong. I DFK, I just guessing.:popcorn:
Click to expand...
Ya, their stoned workers on the assembly line! They made it idiot proof in '70.
 
Ive had my own car ( 1966 ) hooked up both ways in hopes it would get more heat in the car.

None, Nadda , Zilch, Zero difference either way
 
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