Heater hose route

[WillyWillCJ7]

When my dad owned my Jeep he bypassed the heater core when it cracked. The water pump has 3/4” hose coming off but the new core (and old) have 5/8” fitting. Can’t find proper hoses online or at parts store....any advice would be fantastic. ‘83 258cu in.

 

[GRR]

https://shop.advanceautoparts.com/p...17190318-P?searchTerm=3/4+to+5/8+hose+adapter



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[WillyWillCJ7]

https://shop.advanceautoparts.com/p...17190318-P?searchTerm=3/4+to+5/8+hose+adapter



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Thanks, you wouldn’t happen to know which hose goes to top/bottom of the core would you?

 

[Belizean]

Thanks, you wouldn’t happen to know which hose goes to top/bottom of the core would you?

Top to water pump. Bottom to water jacket on intake manifold

 

[Lumpy Grits]

Get the 5/8" ID straight hose.
Put the one end in boiling water and it will stretch enough for the 3/4" fitting.
LG

 

[JeeperChris]

That adapter is exactly what I used when installing new heater lines. I did not have a line to the manifold though.

Do the water jackets in the manifold do anything besides tell the temp and have a knock sensor?

 

[Hurricane4]

You can buy a brass one here - $8.95:

https://www.amazon.com/EDGE-INDUSTR...dapter+5/8+In.+X+3/4+In&qid=1572881895&sr=8-4

EDGE INDUSTRIAL 3/4" X 5/8" Hose ID Brass Barb Reducer SPLICER Fitting Fuel / AIR / Water / Oil / Gas / WOG (Qty 1)

 

[Hurricane4]

Another one on Amazon - aluminum - $5.99: ( Made in U.S.A. )

https://www.amazon.com/Splice-Coupl....+X+3/4+In&qid=1572882188&s=automotive&sr=1-1

ICT Billet 5/8" to 3/4" Inch Hose Barb Splice Coupler Reducer Repair Fitting Adapter Connector Radiator Coolant Intercooler Heat Exchanger Fluid Designed & Manufactured in USA Bare Aluminum AN627-11A

 

[yellow85cj]

Do the water jackets in the manifold do anything besides tell the temp and have a knock sensor?

Keeps fuel/air mix warm after the manifold heater shuts down and keeps the intake from getting hot.

 

[JeeperChris]

Keeps fuel/air mix warm after the manifold heater shuts down and keeps the intake from getting hot.

So the manifold heater is just for start-ups until the water gets warm. Ok, is the heater plugged into a computer or just a 12V source?

 

[yellow85cj]

Works from a relay. Not connected to computer.

Here are a couple of diagrams. In a couple of the FSM diagrams CZ C100 label is the fuse block.

 

[JeeperChris]

Works from a relay. Not connected to computer.

Here are a couple of diagrams. In a couple of the FSM diagrams CZ C100 label is the fuse block.

That's beautiful, thank you so much!!

 

[cleg]

Ran across a pretty good solution for the heater hose from the thermostat housing to the manifold so will share it here.
Attempting to fit a straight hose from point A to point B wasn’t working out so well and I couldn't find a direct fit replacement.

I had a new molded heater hose on the shelf for my wife’s Subaru.
Each end had appropriate bends to navigate half of the route.
I was able to cut a small section out of the middle and connect the center with a 3/4” brass straight fitting.
Complete solution about $12.

2005 Subaru Heater Hose for “thermostat to manifold” Continental # 64332 about $9 from Rockauto.
¾” x ¾” straight brass hose fitting # 818281 from Lowes, about $2.

Cleg