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#1 |
Registered User
![]() Join Date: Jun 2007
Location: Springfield Mo.
Posts: 1,086
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Heater Core Replacement
The heater core in my 86 K10 let go and dumped a bunch of coolant in the floor. Fortunately I wasn't far from home at the time so I limped her back home without overheating. I haven't put one of these in since back in 1995 so my memory is fuzzy on exactly what I need to do to replace it.
My truck has A/C as did the last one that I had to put a heater core in. The only thing that really sticks in my mind on the replacement is that it's a real pain in the ass on an A/C cab like mine. Seems that I had to drop the inner fender out, and take the glovebox out. I think that I may have had to remove the cable for the control and unbolt and drop the plastic box down to access it which is a real pain. Does this sound right? Anybody know of an easy way to do this? I'm open to suggestions to make this as easy as possible. Need some step by step instructions so I can get this old girl back on the road. It figures that it would happen when I had some work for her to do and she decides to lay down on me! ...Joe
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#2 |
Registered User
Join Date: Sep 2009
Location: Mpls, MN USA
Posts: 151
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Re: Heater Core Replacement
The Haynes manual has a pretty good step-by-step actually. Especially if you've done it (or similar) before.
My truck does not have A/C, and I did not have to remove the inner fender at all. Access to the core housing bolts was from under the hood, but other wise the steps you listed sound about right to me. I don't recall any other real special tricks. I know my Haynes walked me thru the control cable disconnection. But again, my non-A/C is going to be different. I've read that it is a tougher task when you have the A/C system to work around. |
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#3 | |
Registered User
![]() Join Date: Jun 2007
Location: Springfield Mo.
Posts: 1,086
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Re: Heater Core Replacement
Quote:
If I remember right the core is held in the housing by a couple of sheetmetal straps. On my last one, one of them was rusted completely through, and I had to buy another one from GM. Hopefully I won't have that problem this time. I do have a repair manual somewhere around the house. I can never find it when I need it though. My wifey has a habit of reorganizing and putting my stuff away somewhere, then can't remember where she put it if it's been a while. Thanks for the reply. ...Joe
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#4 |
Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,906
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Re: Heater Core Replacement
I have heard of people doing it but I replaced my heater core on my A/C cab without.
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Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call Last edited by Prerunner1982; 09-17-2009 at 05:16 PM. |
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#5 |
Registered User
Join Date: Sep 2009
Location: Mpls, MN USA
Posts: 151
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Re: Heater Core Replacement
Joe,
Yup, my wife tries to 'help me organize' my stuff the same way a lot of the times, LOL!!! I think you are right about the straps holding the core in place inside the housing. That's how I remember too. I suppose it could be necessary to pull that inner fender to access some stuff. The nut heads to remove the housing are all accessed from firewall side, on my truck. Pretty sure there were only 3 of them, though. Hope the repair goes well for ya! |
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#6 | |
Registered User
![]() Join Date: Jun 2007
Location: Springfield Mo.
Posts: 1,086
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Re: Heater Core Replacement
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#7 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Heater Core Replacement
Take the glove box and glove box door out of the truck. Take the heater hoses off of the core. There are bolts that go clear through the cab and the nuts are in the engine compartment. Take those off and go into the cab and disconnect the heater control cables and vacuum lines. Roll the heater housing downward and towards the floor of the cab and expose the heater core. Take the small bracket off of one end ot the core and pull from the housing. Re-install in the reverse order.---check all of your foam seals for condition to make sure the heater is sealed.
Put all bolts, hoses, and glove box parts back on.
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Frank |
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#8 | |
Registered User
![]() Join Date: Jun 2007
Location: Springfield Mo.
Posts: 1,086
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Re: Heater Core Replacement
Quote:
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#9 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Heater Core Replacement
I have replaced a few heater cores on the mid eighties trucks, and I have not dropped a fender yet. I use a 1/4" drive ratchet, long extensions and a deep socket.
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Frank |
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