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07-08-2008, 10:52 AM | #1 |
Senior Moment
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,156
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Help on Heater Core replace
My heater core finally gave up the other day - antifreeze all over the floor
Any way, do I pull it from the AC unit or under the dash??? I'm thinking glove box out and under the dash; I'd hate to take the AC unit off the firewall Any help would be appreciated, Oh ya it’s a 1970 with AC Thanks Steve
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
07-08-2008, 11:17 AM | #2 |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
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Re: Help on Heater Core replace
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I don't know a lot about the air units but I'm betting it's on the outside.... Hoping someone will say I'm wrong for your sake. To get the outside air box off you have to take the inner panel loose, and I think the hood hinge off to get to a couple of the screws/bolts and get the box out. LockDoc
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07-08-2008, 11:24 AM | #3 |
Chevy nut
Join Date: Jun 2007
Location: Springfield, Illinois
Posts: 2,266
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Re: Help on Heater Core replace
I am almost sure you have to pull the box off the outside. I seen and air box at the junkyard off. The core was mounted to the outside box.
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07-08-2008, 12:47 PM | #4 |
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Join Date: Feb 2000
Location: Center City, MN, USA
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Re: Help on Heater Core replace
The AC heater core is inside. You need to get the box behind the glove box out. The heater hoses are disconnected from under the hood. There are studs sticking out of the heaterbox that need to be taken off from under the hood.
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07-08-2008, 03:44 PM | #5 |
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Join Date: Feb 2005
Location: Portland OR
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Re: Help on Heater Core replace
+1 on MREIN's reply (comes out from inside) but, there ae some studs with nuts that come loose from under hood.... if you do a search there's a pretty detailed account of removing a heater core from an AC truck.
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71 GMC 1/2 ton 4x4, 350, 350th 67 chev short step, 396, 350th 41 chev flatbed, custom bed, frame & suspension, 350, 350th |
07-08-2008, 03:44 PM | #6 |
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Re: Help on Heater Core replace
With AC under the dash---without, under the hood with the hinge removal
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07-08-2008, 03:58 PM | #7 |
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Re: Help on Heater Core replace
Thank You all. Now who wants to do it - LOL its like 107 outside today, NOT ME
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
07-08-2008, 04:08 PM | #8 |
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Join Date: Aug 2003
Location: Lubbock, Texas
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Re: Help on Heater Core replace
It is going to be so much fun!! A couple of the lower nuts on the studs on the outside of the firewall are nearly imposible to get to with the inner fender in palce. Good luck!
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07-08-2008, 04:19 PM | #9 |
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Re: Help on Heater Core replace
107? Not a problem, just turn on the A/C
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07-08-2008, 04:37 PM | #10 |
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Join Date: Feb 2005
Location: Portland OR
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Re: Help on Heater Core replace
On removing those lower nuts from out side the firewall, choices are.... 1)completely remove the inner fender or, 2)drill a couple of large holes in the inner fender or, 3) what a lot of people do is just remove the lower bolts, and as many others as needed, that hold the inner fender in place, then you should be able to reach in there from underneath, through the tire well area and take the nuts off.
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71 GMC 1/2 ton 4x4, 350, 350th 67 chev short step, 396, 350th 41 chev flatbed, custom bed, frame & suspension, 350, 350th |
07-08-2008, 04:55 PM | #11 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Help on Heater Core replace
Just loop the heater hose back to the other connection on the block,then wait for cooler weather.I don't think you're going to need it right away.
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07-08-2008, 05:07 PM | #12 |
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Re: Help on Heater Core replace
More good info and your right I'm in no hurry to fix it. I already looped it
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
07-08-2008, 05:37 PM | #13 |
Project Junkie! Fishing Poor!!
Join Date: Dec 1999
Location: Olympia,Wa. 98512
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Re: Help on Heater Core replace
Make sure that you purchase a made in the USA heater core. Those seem to fit the best. I have seen many here complain about the fit on the made in Mexico one that you get at most parts houses. I recently sold a made in the USA A/C heater core to a customer in Seattle that tried to install a made in Mexico core that wouldn't fit. He reported back to me to tell me that the USA one fit great. WES
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07-08-2008, 07:24 PM | #14 |
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Re: Help on Heater Core replace
If you are going to replace your heater core - here is a very old thread that I posted pics on my heater core replacement (nearly 5 years ago). It just might be helpful!
Oh - and do it while it is warm - you will thank yourself! Have fun! ~jewels
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07-08-2008, 09:05 PM | #15 | |
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Re: Help on Heater Core replace
Quote:
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2018 Chevy Crew Cab 2006 Impala SS 1965 Plymouth Sport Fury 1970 Chevy Longhorn
70 Longhorn CST Build Adding an AM/FM Decal |
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03-01-2012, 03:14 PM | #16 |
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Join Date: Mar 2012
Location: lubbock texas
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Re: Help on Heater Core replace
Heater core replacement is pretty straight forward. The heater core comes out from under the dash with factory air as follows:
Drain coolant. Remove heater hoses. Remove inner fender from rt. side. Remove 5 nuts from the fire wall mounting the A/C box(the A/C will not need to be disturbed in any way). At this point, inspect all hoses, control valves, etc. Now is the time to replace these items!! Now for under the dash: Remove glove box door. Remove glove box. Unplug A/C relay on side of heater box. Remove all ducts that are immediately on top of the heater box-usually resulting in ducts being destroyed in this year of vehicle due to age. Remove two 5/16" screws attaching mixing door assy. to heater box. Remove 3 5/16" screws attaching mixing door assy. to floor ducting. Slide the mixer door assy. forward and out of the way. Reach inside the heater box and unplug the fan relay, and remove wires from the box. Take the two 7/16" screws out of the box mounting it to the firewall. Remove the box containing the heater core. After removing the box, you can see that the core is held in place by two retaining brackets-one on the front, one on the back. These are held in with two 1/4" screws each. Remove brackets. Remove heater hose tube hold-down. Have a beer, you are half-way through!! Install new core into box. Install box back onto the firewall with two 7?16" screws ONLY. Reconnect all hoses. Fill with coolant. Start engine and bring to operating temp. Turn off engine and let the engine sit with pressure in the coolant system for 2o minutes. Check for leaks in the core, hose connections, etc. If there are none, reassemble. This job takes approximately 3 hours start to finish, not including the beer! |
03-01-2012, 04:10 PM | #17 |
20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
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Re: Help on Heater Core replace
Hey Scott, welcome to the board from NorCal!
If an old thread's gonna be revived, that's the way to do it -- with a great first post, very detailed & informative!!
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03-01-2012, 05:09 PM | #18 |
Florida Edition
Join Date: Oct 2010
Location: Fruitland Park, FL
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Re: Help on Heater Core replace
Also welcome from Central Florida....ditto on a great post (kept me from having to type all that up )
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70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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