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Old 09-26-2019, 10:29 PM
86j10's Avatar
86j10 86j10 is offline
232 I6
Join Date: Nov 26, 2009
Location: PDX, OR
Posts: 148
J10 Heater core instsll

Need some help with a heater core removal and install on my 86 j10. Factory a/c truck. Heater core was good prior. Think I broke the fitting on the core when I was replacing the old heater hoses with new ones because now it leaks. I was able to get the 2 nuts off the box at the firewall and am finding that I may have to pull all the duct work down and out of the way to get to the others.

Last edited by 86j10 : 09-27-2019 at 10:13 AM.
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Old 09-27-2019, 08:23 AM
SJTD SJTD is offline
350 Buick
Join Date: Apr 26, 2012
Location: Lompoc and Sunland, CA
Posts: 1,322
You can see the two nuts holding the heater assembly to the firewall on the engine side. You can also see the two studs that have nuts on the inside.

I have read that one can reach the nuts without removing the AC but haven't tried.

But maybe you can separate the two halves of the heater box without removing it from the firewall?
Sic friatur crustulum

'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.
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Old 10-07-2019, 05:09 PM
johnsonic johnsonic is offline
232 I6
Join Date: Mar 12, 2015
Location: Oregon
Posts: 236
I've read that it's possible to do it without dropping the AC too, but not sure how it's possible without having eyes on your fingertips and a double jointed arm with 4 wrists.
1984 GW
Comp 260H
Magnum Roller Rockers
Wiseco -21cc Forged Pistons
Performer Intake
Holley SA 670
MSD 8523
Dakota Digital custom cluster
Serehill headlamp harness
NWMP aux tank

1987 GW deceased
...but the parts live on
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