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-   -   Heater Core Replacement (https://www.yotatech.com/forums/f116/heater-core-replacement-303684/)

toyobama 03-08-2018 04:06 PM
Heater Core Replacement
 
Hey Y'all, I am fairly new to this site but have a question about replacement heater cores. I have a 1986 Toyota 4Runner, w/o rear heat, that I have completely torn the dash out and noticed that the heater core was quite rusted, so decided to replace it. What is the top replacement heater core since the factory core is no longer available? I bought a Spectra core but it just seem to fit right and is too short.

muddpigg 03-08-2018 04:15 PM
Go have stock one repaired. If there is a "best" replacement I haven't found it.

toyobama 03-08-2018 05:04 PM
I don't think that the one in the 4runner is stock.

muddpigg 03-08-2018 06:02 PM
Originally Posted by toyobama (Post 52392933)
I don't think that the one in the 4runner is stock.
sure, i’ll Bite. Is climate control unit modified?

toyobama 03-08-2018 06:16 PM
Originally Posted by muddpigg (Post 52392939)

sure, i’ll Bite. Is climate control unit modified?
No, it is not modified, at least I don't think it has been.

muddpigg 03-09-2018 03:49 AM
Originally Posted by toyobama (Post 52392943)
No, it is not modified, at least I don't think it has been.
it’s an oddball stock one. Take measurements of it to compare to replacement. I have found one that is same size but it wouldn’t mount to extension tubes. Have tried 4 different aftermarket units. This my experience leads to why my first post said take it to a radiator shop and have it repaired. I also had my extension tubes soldered to heater core.

toyobama 03-11-2018 02:43 PM
Originally Posted by muddpigg (Post 52392961)

it’s an oddball stock one. Take measurements of it to compare to replacement. I have found one that is same size but it wouldn’t mount to extension tubes. Have tried 4 different aftermarket units. This my experience leads to why my first post said take it to a radiator shop and have it repaired. I also had my extension tubes soldered to heater core.
I have sent it to a radiator shop. They are going to acid clean it, fix an potential issues and pressure test it. I don't think that I am going to have it soldered. Do you happen to know what the part # or the size of the o-rings are?

muddpigg 03-11-2018 02:59 PM
15x2.5mm if memory serves. Its on an old post of mine, can google.

toyobama 03-11-2018 04:37 PM
Originally Posted by muddpigg (Post 52393164)
15x2.5mm if memory serves. Its on an old post of mine, can google.
I am looking on McMaster Carr. Is there a particular type of O-Ring that I need to get?

muddpigg 03-11-2018 04:42 PM
If I remember silicon will work but hydrogenated silicon has a wider temp range

toyobama 03-11-2018 04:59 PM
Originally Posted by muddpigg (Post 52393168)
If I remember silicon will work but hydrogenated silicon has a wider temp range
Last question. The 15mm x 2.5mm o-rings. Is the 15mm the Inside Dimension? I really appreciate your help on this.

muddpigg 03-11-2018 05:04 PM
Believe so. But like I said find old post.

IMHO you should replace spring c clips that hold extension tubes to core. Guessing a dealer only part.

toyobama 03-16-2018 04:35 AM
Originally Posted by muddpigg (Post 52393171)
Believe so. But like I said find old post.

IMHO you should replace spring c clips that hold extension tubes to core. Guessing a dealer only part.
I ordered new 15mmX2.5mm o-rings from McMaster and new C-clips from Toyota. How do I get the tubes in now and the C-Clamps on? Those o-rings are definitely thicker than the ones that were on it before.

muddpigg 03-16-2018 08:30 AM
I used a table to set core on. Pressed the tubes on with force, as square as possible, Had one of my minion helpers slide clip on while I compressed o-ring. It is frustrating and tedious but stick with it.


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