Heater core: Replace or patch/recore?

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The next task for my truck is the heater core. I get whiffs of coolant with the heat on full blast and it's also leaking behind/ in/ around the firewall. I am just thankful it lasted as long as it did and didn't officially fail during the winter. I need to pull the dash anyways to fix the HVAC vacuum harness lines since I am only getting air out of the defrost too.

Brand wise, options look a bit limited. I did some reading online today and saw someone recommending to get the original recored.

What are your thoughts on this if I can't find the OE part?
 
Is this for the Blazer? If so I tackled this project in the S10 this winter. Mine actually "exploded" as in massive leak everywhere. Not sure on longevity, but I got one from Carquest for about $50. It is from China, but honestly what isn't? The core has movable tubes that you will need to maneuver it into the core box. I went with a cheaper one because I'm pretty sure it will last the rest of the trucks lifetime. If you plan on keeping yours longer, you might look into the AC Delco, but I bet it's made in China too. Never heard of a recore honestly. At this point while the dash is out might as well replace it. It might seem like a big job, but honestly it's not bad. Took me 5 hours start to finish (dealer book time is 9 hours). Yours will be easier since it's a V6. If you need any pointers feel free to ask!
 
Not a part you want to be replacing again in three years. Buy new, and also start flushing your coolant every 24 months. Failure to do so is probably why the original failed.
 
My kid had a mid 80's Mustang that I replaced multiple heater cores in before I learned a few things. Old vehicles motor mounts wear out and the engine rocks. Your heater hoses may be getting much more movement than you realize and this will move the inlet and outlet tubes. For the Mustang I found a post that showed how to make a brace to help prevent the tubes from moving. Good luck.
 
Originally Posted By: car51
Your original core may be leaking. Id go with new


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Back when heater cores were made of brass and copper, recoring was the way to go. This is a lost art. Good luck finding a shop that still does it. Nowadays replacement is the way to go.
 
Originally Posted By: Kestas
Back when heater cores were made of brass and copper, recoring was the way to go. This is a lost art. Good luck finding a shop that still does it. Nowadays replacement is the way to go.
we recore them all the time if the customer wants to pay that much.
 
Originally Posted By: Imp4
AC Delco Professional (not OE) is $63 on RA.
I would trust this before the other junk options they're offering starting at $25.


I saw the actual OE online for about $75 (the RA listing on the ACD Pro also includes the OE part number to interchange, so google that OE number)
 
Originally Posted By: Delta
Is this for the Blazer? If so I tackled this project in the S10 this winter. Mine actually "exploded" as in massive leak everywhere. Not sure on longevity, but I got one from Carquest for about $50. It is from China, but honestly what isn't? The core has movable tubes that you will need to maneuver it into the core box. I went with a cheaper one because I'm pretty sure it will last the rest of the trucks lifetime. If you plan on keeping yours longer, you might look into the AC Delco, but I bet it's made in China too. Never heard of a recore honestly. At this point while the dash is out might as well replace it. It might seem like a big job, but honestly it's not bad. Took me 5 hours start to finish (dealer book time is 9 hours). Yours will be easier since it's a V6. If you need any pointers feel free to ask!


I remember your write up. It was very detailed. I'll have to go back to it. I've read online people saying about 6-10 hrs. Will probably take me longer with all the complaining breaks, beer breaks and lunch break and distractions. I like to work slow.

Not sure on my system, but I believe it always has water circulating through it so I guess an explosion or severe leak could happen any time. With it being summer, I could at least bypass it though.

As far as the car store brands, I remember working at Oreilly and seeing the junk they sold. Probably all made by the Chong Wang Doo holding company. I would hope the AC Delco would be a little better as I do plan on keeping the truck a while.
 
Originally Posted By: Kestas
Back when heater cores were made of brass and copper, recoring was the way to go. This is a lost art. Good luck finding a shop that still does it. Nowadays replacement is the way to go.


I have a radiator shop ~30 miles away that still does this. Very large business with 4 garage bays as well.
 
Originally Posted By: slacktide_bitog
Originally Posted By: Imp4
AC Delco Professional (not OE) is $63 on RA.
I would trust this before the other junk options they're offering starting at $25.


I saw the actual OE online for about $75 (the RA listing on the ACD Pro also includes the OE part number to interchange, so google that OE number)


Mind sharing that OE part number and where you saw it for $75. Wish you were closer. I'd buy you a beer!
 
Originally Posted By: dlundblad
I remember your write up. It was very detailed. I'll have to go back to it. I've read online people saying about 6-10 hrs. Will probably take me longer with all the complaining breaks, beer breaks and lunch break and distractions. I like to work slow.

Not sure on my system, but I believe it always has water circulating through it so I guess an explosion or severe leak could happen any time. With it being summer, I could at least bypass it though.

As far as the car store brands, I remember working at Oreilly and seeing the junk they sold. Probably all made by the Chong Wang Doo holding company. I would hope the AC Delco would be a little better as I do plan on keeping the truck a while.


Heh, it wasn't as detailed as I would have liked. I do have a series of short videos I took along the way, but never shared as I could never splice them together. I was planning on going slower, but I had momentum and just kept going, lol.

Was the '97 pre-facelift 2nd gen? I know the dash is a little different, but should be the same concept. The coolant flow is constant IIRC, atleast on the 4 cylinder the hard pipe to the core is right off the thermostat housing area. And whatever you do try and remove the bottom two screws going into the inner HVAC box. I thought I could gently bend it back, yea thought... Took about a month for everything to settle again and the creaks and squeaks to stop. Figured I'd give you a heads up on that.

Had I gone back and did it again I would have bought a better core, but the truck is my winter ride and needed it back together ASAP.
 
Originally Posted By: Chris142
Originally Posted By: Kestas
Back when heater cores were made of brass and copper, recoring was the way to go. This is a lost art. Good luck finding a shop that still does it. Nowadays replacement is the way to go.
we recore them all the time if the customer wants to pay that much.

Big as my town is, I could find only one shop that could recore my radiator. As you mentioned, it is expensive. It is cheaper to go with an aluminum replacement.

I ended up repairing the radiator on my 71 Cutlass myself. The solder joint corroded through and I resoldered an end cap.
 
Originally Posted By: dlundblad
Mind sharing that OE part number and where you saw it for $75. Wish you were closer. I'd buy you a beer!


19254457

I can't believe I didn't see the updates to this thread after my last post in it, sorry!

Anyway, even though I gave it to you after you reached out to me via PM, I still wanted to share it in the thread.
 
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