Heater hose set up

1945 - 196*, Willys CJ series, questions, discussions, regarding anything related to the post war jeep.®
Post Reply
User avatar
ghiltgen
Sergeant Major of the Gee
Sergeant Major of the Gee
Posts: 422
Joined: Mon Jan 07, 2013 3:42 pm
Location: Waupaca, Wisconsin

Heater hose set up

Post by ghiltgen » Fri May 21, 2021 7:06 pm

My cj2a is over heating and I am wonder if it is related to how the heater hoses are hooked up. The water pump has 2 ports, at roughly 10 and 2 o’clock position. One heater hose comes off at the 10 o’clock position, the 2 o’clock port is capped. The other heater hose goes to the cylinder head.
When the engine temp gets to 200 and higher, I can’t feel hot water going thru the hose from the thermostat housing to the radiator and then it gets to the point of over heating.
I removed the thermostat and put it in a pot of water with a thermometer and it opens at 180 degrees (don’t tell my wife I am testing jeep parts in the kitchen!). my conclusion is that that water flow won’t go into to the thermostat housing, and therefore the radiator, because of the flow direction thru the head due to the hose arrangement.
Dose this sound plausible? What is the best arrangement for the heater hoses?

Thanks,

GHiltgen
ghiltgen
1943 MB SN 226406
Veteran Award, Motorpool Class 2021
GPW 127386
1948 CJ2A
MVPA member 36543


Wolfman
G-Lieutenant General
G-Lieutenant General
Posts: 6863
Joined: Sat Jan 12, 2008 5:25 am
Location: Tipton,In.

Re: Heater hose set up

Post by Wolfman » Sat May 22, 2021 5:31 am

Sounds like your hoses are correct.
The hot water to the heater comes from the rear of the cylinder head and returns to the port in the water pump on the passenger side.
The port on top of this pump is for a by-pass hose, to the front of the cylinder head on an F head engine.
When this pump is used on L head engine. The port is blocked. Like yours.
Do the heater hoses get hot ??
My first thought is, your radiator is plugged but if the heater hoses are cold too, may be a water pump problem.
Don't worry. I won't tell the little Mrs.
Mike Wolford
CJ-2A
VEP GPW
Comm./Inst. SEL
AOPA ( 50 yrs)
EAA ( 49 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB

Steve Webb
G-General
G-General
Posts: 16659
Joined: Fri Jan 17, 2003 3:40 pm
Location: Fort Myers, Florida

Re: Heater hose set up

Post by Steve Webb » Sat May 22, 2021 6:54 am

A non contact thermometer could be really helpful for checking your temps. I use one as an electrical contractor checking connections on lugs and breakers. They are fairly inexpensive from around 30.00 bucks and up.
Stand for the Flag, Kneel for the Cross Psalm 55; 9-11

Rus Curtis
G-Second Lieutenant
G-Second Lieutenant
Posts: 503
Joined: Wed Apr 05, 2006 3:51 am
Location: Alabama

Re: Heater hose set up

Post by Rus Curtis » Sat May 22, 2021 7:44 am

Great! 2 threads on this.
Rus Curtis
'54 CJ-3B
T3-C

User avatar
ghiltgen
Sergeant Major of the Gee
Sergeant Major of the Gee
Posts: 422
Joined: Mon Jan 07, 2013 3:42 pm
Location: Waupaca, Wisconsin

Re: Heater hose set up

Post by ghiltgen » Sat May 22, 2021 5:09 pm

The heater hoses do get hot. So radiator flush would be the next step? I believe the water pump is fine I rebuilt it about a year ago. I haven’t flushed out a radiator before any words of wisdom!

Thanks,
Greg
ghiltgen
1943 MB SN 226406
Veteran Award, Motorpool Class 2021
GPW 127386
1948 CJ2A
MVPA member 36543

Wolfman
G-Lieutenant General
G-Lieutenant General
Posts: 6863
Joined: Sat Jan 12, 2008 5:25 am
Location: Tipton,In.

Re: Heater hose set up

Post by Wolfman » Sun May 23, 2021 4:46 am

Start with a cooling system cleaner you buy at the parts store.
Follow the instructions on the bottle.
Note: The stuff you buy these days is no where near as good as what we could get in by gone days. Nuff Said.
After using the flush. Drain the system and pull the radiator.
Out with the garden hose.
You can get better results with reverse flushing.
What ever is in there was pushed in from the top down so put the hose in the outlet at the bottom of the radiator and see what comes out the inlet and radiator cap neck at the top.
If you like what you see, lots of gunk comes out, there is hope.
If not much comes out but water, radiator shop.
This method also gives some clue to flow.
With the hose in the top inlet, Radiator cap on, hose on full. Just your hand around the hose & inlet to seal. Don't want the seal too tight. This is a 4 lb. system and most home water systems run 35 to 60 PSI.
If most of the water in the inlet comes out the bottom outlet, this is good.
But if the garden hose flow in gets ahead of the flow out the bottom, not so good.
A radiator with clear tubes should easily stay ahead of the flow from a water hose. Unless you are using a fire hose.
Also, while you are at it, spray the outside of the radiator core with engine degreaser. Not the foamy type.
Spray a lot. From both sides. Let the degrease soak the core.
Let it set a few minutes and then flush the outside of the core with the water hose. From both sides. See what comes out.
You can blow a radiator out with air and be convinced it is clean and then do what I just suggested and be surprised at what comes out.
Mike Wolford
CJ-2A
VEP GPW
Comm./Inst. SEL
AOPA ( 50 yrs)
EAA ( 49 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB

User avatar
ghiltgen
Sergeant Major of the Gee
Sergeant Major of the Gee
Posts: 422
Joined: Mon Jan 07, 2013 3:42 pm
Location: Waupaca, Wisconsin

Re: Heater hose set up

Post by ghiltgen » Sun May 23, 2021 5:35 pm

I am going to try it tomorrow. I am thinking I should do the system flush with the thermostat removed.
Ill post an update.
Thanks!

Greg
ghiltgen
1943 MB SN 226406
Veteran Award, Motorpool Class 2021
GPW 127386
1948 CJ2A
MVPA member 36543

Wolfman
G-Lieutenant General
G-Lieutenant General
Posts: 6863
Joined: Sat Jan 12, 2008 5:25 am
Location: Tipton,In.

Re: Heater hose set up

Post by Wolfman » Mon May 24, 2021 5:01 am

Remove the thermostat ??
Read the label, but
I am thinking for the cleaner to work at it's best, the coolant needs to get up to operating temp.
Another thought hit me.
Don't use a high pressure washer to clean the outside of the radiator core. Destroys the fins.
How do I know ??
Farmers !!
Mike Wolford
CJ-2A
VEP GPW
Comm./Inst. SEL
AOPA ( 50 yrs)
EAA ( 49 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB

User avatar
ghiltgen
Sergeant Major of the Gee
Sergeant Major of the Gee
Posts: 422
Joined: Mon Jan 07, 2013 3:42 pm
Location: Waupaca, Wisconsin

Re: Heater hose set up

Post by ghiltgen » Mon May 24, 2021 6:44 pm

Some how got two threads started. See above post for how it worked out.
Thanks for you advice Mike!
ghiltgen
1943 MB SN 226406
Veteran Award, Motorpool Class 2021
GPW 127386
1948 CJ2A
MVPA member 36543


Post Reply

Return to “CJ Technical Knowledge Base”

Who is online

Users browsing this forum: No registered users and 16 guests