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Heater core
#1392603 Thu Jan 14 2021 01:59 AM
Joined: Mar 2017
Posts: 275
L
LeeD Offline OP
Shop Shark
I posted a few weeks ago about my weak heater and replacing the 160 thermostat with a 180 version. Unfortunately, during the test drives, the gauge goes half way between the midpoint and the top end before settling down just over the mid mark (by this time I have the heater on full trying to help get the temp down). So I pulled the 180 thermostat and tested it; which showed it to be a 190 thermostat! I reinstalled the 160 deciding I could live with it here in Texas, but noticed that I now have a small leak from the core running into the cab. I guess the high heat/pressure might have opened something up (sorry this is such a long story). To finally get to my question, is there anything I can do to try to seal up the core? I ordered a new one online, but was told that it will not be here until mid january (maybe, he admitted that it is coming from China). Instead of waiting, what else can I try?

Thanks, Lee.

Oh, and it is the non deluxe version heater, just a recirc fan in the round core.


1956 Chevy 3200, 235 w/3 speed
Re: Heater core
LeeD #1392606 Thu Jan 14 2021 02:13 AM
Joined: Mar 2019
Posts: 1,138
G
Shop Shark
Well about the only thing i could think of would be to connect da heater hoses together temporarily. No heat, but no leak either.

Re: Heater core
glenns towing #1392608 Thu Jan 14 2021 02:24 AM
Joined: Sep 2001
Posts: 30,807
ace skiver
Originally Posted by glenns towing
Well about the only thing i could think of would be to connect da heater hoses together temporarily. No heat, but no leak either.

Been there, done that.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Heater core
LeeD #1392609 Thu Jan 14 2021 02:42 AM
Joined: May 2015
Posts: 3,196
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Send it off to this guy and let him fix it up for you. wink


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Heater core
LeeD #1392615 Thu Jan 14 2021 04:38 AM
Joined: Dec 2014
Posts: 748
M
Shop Shark
Bars Leak, Silver Solder, Blue Devil, etc. I've done a couple of "temporary" repairs with these products that ended up lasting the life of the vehicle.


1949 Chevy Panel Truck
Re: Heater core
LeeD #1392619 Thu Jan 14 2021 06:02 AM
Joined: Jul 2014
Posts: 271
1
Shop Shark
Back in the day that I wrenched for a logging company, each re-cored radiator got a quart can of Bars Leaks. Otherwise they would be leaking again in a month or so. Rough roads, don't ya know. Don't put a whole quart in a pickup.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Heater core
LeeD #1392629 Thu Jan 14 2021 01:36 PM
Joined: Mar 2017
Posts: 275
L
LeeD Offline OP
Shop Shark
I did the circle hoses trick so I am still driving at least. I could not find where it was leaking when I took it out (it looked like it was coming from inside) but I did not put air in it to try to pin point the location. If I can find the leak I will try my hand at soldering and see if I can fix it.

Lee.


1956 Chevy 3200, 235 w/3 speed
Re: Heater core
LeeD #1392642 Thu Jan 14 2021 04:08 PM
Joined: Apr 2009
Posts: 554
H
Shop Shark
I had poor luck with having the heater core repaired by a local radiator shop. It didn't leak until the water got up to temperature and then started a small leak. Did this 2 times. Finally purchased a replacement core from Brassworks. I posted about it here https://www.stovebolt.com/ubbthread...rks_Recirculating_Heate.html#Post1011395

Re: Heater core
LeeD #1392647 Thu Jan 14 2021 05:04 PM
Joined: Mar 2017
Posts: 275
L
LeeD Offline OP
Shop Shark
I may have the same issues about it only leaking when hot. I just pumped it up to about 20 psi (in a tub of H2O) and it did not leak. I am going to reinstall it and see if the leak returns.

Lee.


1956 Chevy 3200, 235 w/3 speed
Re: Heater core
LeeD #1392648 Thu Jan 14 2021 05:11 PM
Joined: Mar 2017
Posts: 275
L
LeeD Offline OP
Shop Shark
Chuck,
I just read your post on the Brassworks core; really nice! I’ll look into that if my original is still leaking.

Lee.


1956 Chevy 3200, 235 w/3 speed
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