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Jul 21st, 2025 | | | | Joined: Sep 2019 Posts: 62 'Bolter | | 'Bolter Joined: Sep 2019 Posts: 62 | i have a 1948 chevy truck , with a 235 engine, and i have a small leak in the heater core, and i would like to ideally isolate the heater ( with piping or valve) to I can continue to drive my truck while taking my time in replacing or repairing the core. It is warm now in Montana, with no need for heat for 6 months plus. thanks
Last edited by Phak1; 04/27/2023 6:45 PM. Reason: Edited by Moderator:Corrected spelling directly to subject.
1948 3/4 ton Chevy Pickup
| | | | | Joined: Jun 2022 Posts: 530 'Bolter | | 'Bolter Joined: Jun 2022 Posts: 530 | Remove one end of a heater hose from the heater and one end of the other heater hose from the waterpump. One hose will route from the waterpump back to the waterpump and the other will circle back to the heater.
~~ Jethro 1954 3100Back to LifeIn the Dity Gallery1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020 | | | | | Joined: Jul 2014 Posts: 333 'Bolter | | 'Bolter Joined: Jul 2014 Posts: 333 | I have this valve on the hose going into the heater core that I use to open/close/regulate flow to the heater in lieu of the Ranco valve. It was around $20 at O'Reilly, and I use a $10 choke cable to work it from in the cab, but if all you want to do is isolate the heater, you don't need the cable. I don't know if there's risk of the system sucking air in through the leak or not. https://media.fotki.com/2v2aS82LyxDubp.jpgOr you can remove the hoses, loop one (or a short length of another hose) to the hose fittings on the water pump and thermostat housing to bypass the heater. I assume you don't want to remove the hoses altogether and put plugs in place of the fittings on the water pump and thermostat housing since you intend to fix or replace the core to put it back in service. | | | | | Joined: Jan 2022 Posts: 1,986 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 1,986 | I'd remove both hoses at the heater end and connect them together. That way you don't have to cut any hoses.
IF (big if) the hoses are different diameters, you should be able to find a 5/8" to 3/4" diameter adapter at your FLAPS.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Just remove the hoses at the heater core and plug them. There's no need to circulate coolant through them at all- - - -the cooling system will work without any heater core flow.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Just remove the hoses at the heater core and plug them. There's no need to circulate coolant through them at all- - - -the cooling system will work without any heater core flow.
Jerry Yep. Heater was an option you had to pay extra for. The trucks without a heater came with NPT plugs in the water pump holes.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Oct 2021 Posts: 5,684 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 5,684 | My '39 Packard has a factory heater with a brass gate valve on the hot water outlet in the cylinder head. Open it in the winter and close it in the spring to keep anyhot water at all from warming up the cabin.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Putting a valve in one of the hoses will not solve the leak problem. There still will be coolant in the heater with some pressure.
George
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
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