heater core leaking.........grrrr - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cag · 11-27-2024, 06:26 PM

how do i change this thing out, and what is the best one to get??

**78 Big10 454** · 11-27-2024, 10:06 PM

I swapped out mine using a heater core I got from NAPA auto parts. This is the video I used to do the swap:

https://www.youtube.com/watch?v=Ec5aIn1MmrY

Allot yourself the time necessary to do this swap. Lay down some towels or rags over the interior carpet, just in case you spill some residual coolant. I took photos step-by-step and labeled and marked everything I could. Clean up everything as you go. It was a solid four hour job. Take your time and take a breather if you get frustrated. Once you complete the job, you'll be surprised how satisfying it was to do it.

**straight6chevyguy** · 11-28-2024, 12:20 AM

Is an a/c or none a/c truck?

franken · 11-28-2024, 04:33 AM

You might be able to fix it. Maybe look at it.

Dead Parrot · 11-28-2024, 04:41 AM

Here is a forum thread on the subject: http://67-72chevytrucks.com/vboard/s...d.php?t=460942

AC equipped truck although heat only isn't that much different. I have replaced both types.

One thing to watch is that many replacement heater cores are of the "One size fits many" type and may need a bit of gap sealing to get the best air flow performance.

As mentioned above, allot several hours for the task. Take breaks. When finished, check nearby wiring and such to make sure elbows didn't knock something loose while you were reaching for one of those hard to get at nuts.

**old Rusty C10** · 11-28-2024, 11:07 AM

I second getting the new core at NAPA seems they are a better quality part

Loco83 · 11-29-2024, 02:01 PM

Living in Cali my heater core started leaking some thirty years ago, at the time I just disconnected the hoses to swap it out at a later date since it was the middle of summer, still wondering when I'll get to it.

chris989 · 12-16-2024, 05:13 PM

Quote:

Originally Posted by cag

how do i change this thing out, and what is the best one to get??

I bought a aluminum one and it fit so so... bought a copper OEM type and it fit perfect with no movement.

KQQL IT · 12-17-2024, 12:15 PM

Just did ours in the 91 crew cab.
Did it all from the glovebox.
Except the 2 nuts from under the ac suitcase.
Used an aluminum core works ok so far.

11-27-2024, 06:26 PM	#1
cag Registered User Join Date: Aug 2022 Location: winneconne, wisco Posts: 53	heater core leaking.........grrrr how do i change this thing out, and what is the best one to get??

11-27-2024, 10:06 PM	#2
78 Big10 454 78 Big10 454 Join Date: Jul 2008 Location: Pismo Beach, CA Posts: 839	Re: heater core leaking.........grrrr I swapped out mine using a heater core I got from NAPA auto parts. This is the video I used to do the swap: https://www.youtube.com/watch?v=Ec5aIn1MmrY Allot yourself the time necessary to do this swap. Lay down some towels or rags over the interior carpet, just in case you spill some residual coolant. I took photos step-by-step and labeled and marked everything I could. Clean up everything as you go. It was a solid four hour job. Take your time and take a breather if you get frustrated. Once you complete the job, you'll be surprised how satisfying it was to do it. __________________ 1978 Chevy SWB C-10 2WD 454/400 Last edited by 78 Big10 454; 11-28-2024 at 03:18 PM.

11-28-2024, 12:20 AM	#3
straight6chevyguy Senior Member Join Date: Dec 2018 Location: yamhill OR Posts: 909	Re: heater core leaking.........grrrr Is an a/c or none a/c truck? __________________ 1965 chevy c20 292 4speed http://67-72chevytrucks.com/vboard/s...d.php?t=777601 1976 chevy c10 250 4speed http://www.67-72chevytrucks.com/vboa...d.php?t=787037 1978 chevy c20 350 4speed 1998 chevy c1500 4.3L 5speed 2002 Chevy s10 4.3L auto 4x4 Plus a Mercury & some Fords... To many projects!

11-28-2024, 04:33 AM	#4
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,124	Re: heater core leaking.........grrrr You might be able to fix it. Maybe look at it.

11-28-2024, 04:41 AM	#5
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,611	Re: heater core leaking.........grrrr Here is a forum thread on the subject: http://67-72chevytrucks.com/vboard/s...d.php?t=460942 AC equipped truck although heat only isn't that much different. I have replaced both types. One thing to watch is that many replacement heater cores are of the "One size fits many" type and may need a bit of gap sealing to get the best air flow performance. As mentioned above, allot several hours for the task. Take breaks. When finished, check nearby wiring and such to make sure elbows didn't knock something loose while you were reaching for one of those hard to get at nuts.

11-28-2024, 11:07 AM	#6
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: heater core leaking.........grrrr I second getting the new core at NAPA seems they are a better quality part __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

11-29-2024, 02:01 PM	#7
Loco83 Registered User Join Date: Nov 2018 Location: Cali Posts: 322	Re: heater core leaking.........grrrr Living in Cali my heater core started leaking some thirty years ago, at the time I just disconnected the hoses to swap it out at a later date since it was the middle of summer, still wondering when I'll get to it.

12-17-2024, 12:15 PM	#9
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,256	Re: heater core leaking.........grrrr Just did ours in the 91 crew cab. Did it all from the glovebox. Except the 2 nuts from under the ac suitcase. Used an aluminum core works ok so far. __________________ " That didnt make it any newer " " Dont antique the equipment "



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