The Ford Barn

BigDan · 09-16-2017, 12:15 PM

My'46 heater core has sprung a leak. Since I store the car in winter , I'd like to just have the coolant bypass the heater but leave it in place under the dash. I see one hose going from the left lower radiator hose through the firewall to the heater and another coming through the firewall to a port on the opposite (driver's side) head. My plan is to join these two hoses under the hood or put shut-off valves on the engine side in both of them. Is either of these a viable solution? If not, does the heater need to come out and what does that involve? Thanks in advance for any comments, suggestions etc. I'm always grateful for the good advice that comes from the Barn.

Dan

flathead48 · 09-16-2017, 12:36 PM

Normally there is a shut off on the head that you close and that stops the water from circulating through the header.

oldford2 · 09-16-2017, 02:02 PM

Quote:

Originally Posted by flathead48

Normally there is a shut off on the head that you close and that stops the water from circulating through the header.

I believe there will still be water in the other hose and will be pressurized by whatever your radiator cap pressure is. Your idea to just join the 2 hoses should work and no need for shutoffs in them. JMO
John

51 MERC-CT · 09-16-2017, 02:16 PM

Any 5/8" dia. rod (metal,wood etc.) clamped in the tubes going to the heater to plug.
The water does not have to circulate.
When core is repaired, remove plugs and reassemble.

BigDan · 09-16-2017, 04:10 PM

Thanks guys!

RKS.PA · 09-16-2017, 04:14 PM

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The water flows from your lower right radiator hose through the heater and then back out of the heater into the head fitting. As noted above, I, too, have a shutoff at the head fitting. Just connect the input hose to the head fitting and let it circulate, with or without the shutoff closed.

Am running the one on my '47 like that now until I get the heater back in the car following engine and trans rebuild. (I needed to take the heater out to remove the floor pan.)

Dick.

09-16-2017, 12:15 PM	#1
BigDan Member Join Date: Mar 2011 Posts: 34	Heater bypass My'46 heater core has sprung a leak. Since I store the car in winter , I'd like to just have the coolant bypass the heater but leave it in place under the dash. I see one hose going from the left lower radiator hose through the firewall to the heater and another coming through the firewall to a port on the opposite (driver's side) head. My plan is to join these two hoses under the hood or put shut-off valves on the engine side in both of them. Is either of these a viable solution? If not, does the heater need to come out and what does that involve? Thanks in advance for any comments, suggestions etc. I'm always grateful for the good advice that comes from the Barn. Dan

09-16-2017, 12:36 PM	#2
flathead48 Senior Member Join Date: May 2010 Location: Saratoga Springs, NY Posts: 1,318	Re: Heater bypass Normally there is a shut off on the head that you close and that stops the water from circulating through the header.

09-16-2017, 02:16 PM	#4
51 MERC-CT Senior Member Join Date: May 2010 Location: East Hartford, Ct Posts: 5,898	Re: Heater bypass Any 5/8" dia. rod (metal,wood etc.) clamped in the tubes going to the heater to plug. The water does not have to circulate. When core is repaired, remove plugs and reassemble. __________________ DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES

09-16-2017, 04:10 PM	#5
BigDan Member Join Date: Mar 2011 Posts: 34	Re: Heater bypass Thanks guys!

09-16-2017, 04:14 PM	#6
RKS.PA Senior Member Join Date: Jun 2010 Location: Oro Valley, AZ Posts: 1,250	Re: Heater bypass Sponsored Links (Register now to hide all advertisements) The water flows from your lower right radiator hose through the heater and then back out of the heater into the head fitting. As noted above, I, too, have a shutoff at the head fitting. Just connect the input hose to the head fitting and let it circulate, with or without the shutoff closed. Am running the one on my '47 like that now until I get the heater back in the car following engine and trans rebuild. (I needed to take the heater out to remove the floor pan.) Dick.