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

oldschooler · 11-12-2007, 11:32 AM

o.k. guys. i noticed anti-freeze dripping under hood. It was coming from the heater core. Is this replaced from under the hood or is like the newer vehicles, and comes out from under the dash? It looks like a simple under hood fix, but didnt want to tear into it not knowing for sure. Thanks Guys. Later, Rich

**71swb4x4** · 11-12-2007, 12:51 PM

It is a pretty simple under the hood fix. I have changed a few, and you can squeak the heater box off with the hood hinge left on, but it's a bit easier if you remove the hood hinge before you pull the heater box.

oldschooler · 11-12-2007, 12:55 PM

Thanks buddy, I was beginning to wonder if anyone has had a heater core leak before. Thanks again, Rich

48 ish · 11-12-2007, 03:12 PM

I just pulled mine last week. Be careful, there is a screw tab in the lower left hand corner (looking at the firewall) that I couldn't see and ended up breaking it off. Other than that it was easy...

scotts72heavyhalf · 11-12-2007, 03:23 PM

I have found the best way to replace the heater core is to remove the passenger front tire and inner fenderwell before starting the project, it make getting to all the fastners so much eaiser and the job goes much smoother. its very quick to remove the inner fenderwell and you can also clean up the battery box and other items that might need attention. Also make sure you get the heater core and heater box reseal kit before you start the project, I had to wait a week to get those in the mail and you will have it all apart and you might as well rebuild the box gaskets as its only a $23.00 kit. Good luck its about a two hour job in all.

tk1251k · 11-12-2007, 03:45 PM

My gmc has air changed a few years back from insidecab Not hard at all.

smoked68 · 11-12-2007, 07:00 PM

Changed mine 2 weeks ago,Advance auto,38.00. Not too bad a job, I did break off the bottom left tab though. No biggie I used the black RTV sealer all the way around, bolted back up and it works wonderfully. Nice HOT air for a change. Cleaned out enought leaves to fill the bed of the truck. Good Luck. Mike........

oldschooler · 11-12-2007, 07:44 PM

Thanks for all the input guys, i appreciate it alot. Thats why I love this site. Later, Rich

Longhorn Man · 11-12-2007, 08:09 PM

Quote:

Originally Posted by scotts72heavyhalf

I have found the best way to replace the heater core is to remove the passenger front tire and inner fenderwell before starting the project...
...Good luck its about a two hour job in all.

The difference here, oldschooler is in the rust belt... sometimes, it can take 30 min just to remove ONE wheel well bolt. Kinda sucks.

Quote:

Originally Posted by tk1251k

My gmc has air changed a few years back from insidecab Not hard at all.

No where near the same. A/C truck is a total differant animal.

here is a thread with pics.. step by step;
http://67-72chevytrucks.com/vboard/s...d.php?t=124556

tk1251k · 11-12-2007, 09:48 PM

Mine took about an hour all from inside with a/c. no problem.

oldschooler · 11-13-2007, 06:29 AM

Quote:

Originally Posted by Longhorn Man

The difference here, oldschooler is in the rust belt... sometimes, it can take 30 min just to remove ONE wheel well bolt. Kinda sucks.

No where near the same. A/C truck is a total differant animal.

here is a thread with pics.. step by step;
http://67-72chevytrucks.com/vboard/s...d.php?t=124556

You got that right Andy, I dont think I will be taking off the inner fender. In a perfect world, that might be the way to go. My truck pretty much still has all the 35 year old stuff on it. So it is either rusted tight or rusted off.

Longhorn Man · 11-13-2007, 02:14 PM

you can locate the PITA bolt, and then drill a hole in the fenderwell and then put a rubber plug in it. Thats the way they would access spark plugs on some of detroits *tightly packed* offerings.

11-12-2007, 11:32 AM	#1
oldschooler Registered User Join Date: Mar 2007 Location: spring grove, Pa. Posts: 538	leaking heater core. o.k. guys. i noticed anti-freeze dripping under hood. It was coming from the heater core. Is this replaced from under the hood or is like the newer vehicles, and comes out from under the dash? It looks like a simple under hood fix, but didnt want to tear into it not knowing for sure. Thanks Guys. Later, Rich

11-12-2007, 12:51 PM	#2
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,499	Re: leaking heater core. It is a pretty simple under the hood fix. I have changed a few, and you can squeak the heater box off with the hood hinge left on, but it's a bit easier if you remove the hood hinge before you pull the heater box. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

11-12-2007, 12:55 PM	#3
oldschooler Registered User Join Date: Mar 2007 Location: spring grove, Pa. Posts: 538	Re: leaking heater core. Thanks buddy, I was beginning to wonder if anyone has had a heater core leak before. Thanks again, Rich

11-12-2007, 03:12 PM	#4
48 ish Registered User Join Date: Mar 2007 Location: Kennewick, WA Posts: 65	Re: leaking heater core. I just pulled mine last week. Be careful, there is a screw tab in the lower left hand corner (looking at the firewall) that I couldn't see and ended up breaking it off. Other than that it was easy... __________________ hooberjon@yahoo.com "Life's Been Good To Me So Far" 1941 Chevy PU (new project, right out of the field) 1948 P/U: 350/700r4, Nova Clip,Chevelle rear, air ride suspension, custom door handles, custom firewall, custom dash, buckets and console, visor 1967 C20: 427 Tall Deck, Turbo 400 with Gear Vendors aux tranny, 5th wheel, 3500 bucket seats and console. 1996 Geo Tracker 2x4 1996 Geo Tracker 4x4 Last edited by 48 ish; 11-12-2007 at 03:13 PM.

11-12-2007, 03:23 PM	#5
scotts72heavyhalf Registered User Join Date: Aug 2007 Location: Sandy, Oregon Posts: 1,551	Re: leaking heater core. I have found the best way to replace the heater core is to remove the passenger front tire and inner fenderwell before starting the project, it make getting to all the fastners so much eaiser and the job goes much smoother. its very quick to remove the inner fenderwell and you can also clean up the battery box and other items that might need attention. Also make sure you get the heater core and heater box reseal kit before you start the project, I had to wait a week to get those in the mail and you will have it all apart and you might as well rebuild the box gaskets as its only a $23.00 kit. Good luck its about a two hour job in all. __________________ Scotts72C10

11-12-2007, 03:45 PM	#6
tk1251k Registered User Join Date: Nov 2005 Location: Newton Posts: 174	Re: leaking heater core. My gmc has air changed a few years back from insidecab Not hard at all.

11-12-2007, 07:00 PM	#7
smoked68 Registered User Join Date: Oct 2006 Location: Rock Hill, SC Posts: 421	Re: leaking heater core. Changed mine 2 weeks ago,Advance auto,38.00. Not too bad a job, I did break off the bottom left tab though. No biggie I used the black RTV sealer all the way around, bolted back up and it works wonderfully. Nice HOT air for a change. Cleaned out enought leaves to fill the bed of the truck. Good Luck. Mike........ __________________ 1968 chevy shortbed, Dark Shadow Gray 4 bolt 383 Stroker,Weiand Super Charger, disc brakes, 9 inch, 391 gear, 20" Eagle wheels, muncie 4 speed/ Hurst shifter, 4/7 drop, Hedman midlengths, 3 inch exhaust w/ 2 chamber flows. 1966 Mustang with 306 roller, c-4, 9 inch Detroit locker rear. 1965 Fastback Mustang w/347 stroker, top loader 4spd, 9 inch detroit locker. 1966 Mustang coup, 306 roller, c4, 9 inch. 65 Cobra, 427, T6oo, 9inch, of course. First gen Hayabusa, airbox mod and running 2 exhaust cams.. Zoom Zoom Zoom

11-12-2007, 07:44 PM	#8
oldschooler Registered User Join Date: Mar 2007 Location: spring grove, Pa. Posts: 538	Re: leaking heater core. Thanks for all the input guys, i appreciate it alot. Thats why I love this site. Later, Rich

11-12-2007, 09:48 PM	#10
tk1251k Registered User Join Date: Nov 2005 Location: Newton Posts: 174	Re: leaking heater core. Mine took about an hour all from inside with a/c. no problem.

11-13-2007, 02:14 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: leaking heater core. you can locate the PITA bolt, and then drill a hole in the fenderwell and then put a rubber plug in it. Thats the way they would access spark plugs on some of detroits tightly packed offerings.



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