heater hoses connection to engine

[Cisco82]

Hi guys ,

happy new year!! i strongly hope 2021 will be better than the terrible 2020..

Yesterday the enginne started after 8 years .. it works good! i have a question regarding the heater hoses connection to engine... i wanst able to find the information regarding to which hose (comeing from heater) should be connected to the cylinder head , i suppose there is a indication , it cant be indifferent ... could you help me?

thanks

francesco

[rickf]

I am not sure if it really matters, all it is doing is circulation hot water through the heater core. There is no shut off valve so it is on all the time unless you close the valves at the engine.

[Cisco82]

thanks , i supposed there was one way only

[Horst]

Bildschirmfoto 2021-01-03 um 17.14.21.png

[rickf]

And there you have it, Thanks Horst. I will bet though that is for aesthetics only so it all looks pretty in the picture. The heater core really doesn't care which way the water is moving through it. I am not looking at the core so I don't know how the hose connections are oriented but if it has a high and low connection I would put the inlet on the low connection so as to keep any silt and garbage flowing through in the bottom of the core. Keeps the garbage from flowing down into the tubes.

[Mark]

Mutt Heater Hose Shut off Valves.png[attachment=0]Mutt Heater Hose Shut off Valves.png

[muttguru]

This question came up at the War and Peace show in 2016.
I posted this on the G503 Board in 2017 after taking advice from Big George. It certainly cured my lukewarm heater.
Ken

Dear G-503ers,
As winter approaches, it's time to start thinking about one or two checks on that hot-water heater in your mutt.
Last year several people asked for suggestions as to why their heater wasn't performing as well as it should and I put forward the usual suspects... thermostat not operating properly, cooling system needing a flush-out, stop-cocks not fully open etc. Despite the suggestions, a couple of mutt-owners reported continuing heater problems.

I was discussing this at Beltring with my friend George Ramselaar and he stunned me with a simple suggestion. "Check the heater hoses and make sure they are connected the right way up". When I asked him what he meant, George explained that the two heater hoses can be connected to the heater in two ways, one "right" and one "wrong". I checked my TM and sure enough, he was correct.

The longer of the two hoses should be connected to the shutoff cock at the water pump, with the other end connected to the HIGHEST of the heater inlet/outlet pipes.
The shorter of the two hoses should be connected to the shutoff cock on the cylinder head, with the other end connected to the LOWEST heater inlet/outlet pipe.

When my friends checked their mutt heater setups, sure enough, the hoses were hooked up in true Murphy's Law fashion.

Moral of this story? Go out and check yours before that icy wind freezes your fingers to the steering wheel.

[csmith]

Started Miss Camo up last week, let her run a bit and turned the heater on, opened the engine cocks and there it was, hot air! Not like today's cars but with winter cover its not so bad. At least down here in VA winters

[Mark]

Makes me wonder if mine are right? Looks like it is.

[rickf]

That is interesting to note. I don't have a heater in mine, it is still new in the box and probably will be until I sell it. Most of the time when a heater core is directional there are two different size hoses. So Francesco, Disregard what I was saying about putting them wherever, Apparently I was wrong on this one.

[Cisco82]

I also saw that picture into TM and i thought it was only a sketch, i ll follow its indicaton. thx

[svramselaar]

hi

the hose at the cylinder head is the upper core hose
the hose at the waterpump is the lower core hose

george

[muttguru]

the hose at the cylinder head is the upper core hose
the hose at the waterpump is the lower core hose
george

Oh No ! (hangs head in shame). Now I need to see if I can track down the half-dozen folks who I've responded to over the last 3 years
Ken

[rickf]

Personally I still think this is a very basic heater core with no one way valves in it and direction of travel makes no difference. I have to wonder if those that were having problem did not have clogged cores and when the hoses were reversed the cores cleared themselves out which is exactly how you would flush a core. What are your thoughts George?

[Mark]

I put a heater in the 151, the core just had 2 tubes for the hoses, 1 of the venders told me that this is the hardest task to do on the 151 jeep.The heater assembly would barely fit under the dash, the hoses were another story.It is not a very efficient heater IMO