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Old 12-09-2011, 06:43 PM   #1
62 short step
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64 heater box

For some reason i cant figure out why i cant pull the top off to change the heater core. The first cover came off fine but the second one seems to be stuck in the back. I know all of the screws are out, that i can see any way. Any ideas?
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Old 12-09-2011, 11:32 PM   #2
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Re: 64 heater box

somebody glued it shut?
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Old 12-10-2011, 12:09 AM   #3
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Re: 64 heater box

pics?
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Old 12-10-2011, 01:59 AM   #4
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Re: 64 heater box

Sometimes they seem to hang up where they are attached to the firewall. Could also be, someone used an adhesive on the seal like dthela mentioned.
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Old 12-10-2011, 07:10 AM   #5
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Re: 64 heater box

the best seal i found for the box is flexible black electrical sealant soft rubber. stays soft and tacky forever
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Old 12-10-2011, 07:11 AM   #6
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Re: 64 heater box

by the way, what 2 covers, only one right?
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Old 12-10-2011, 09:24 AM   #7
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Re: 64 heater box

I'll get pics later today.
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Old 12-10-2011, 08:35 PM   #8
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Re: 64 heater box

On my 65, I had to remove it from the firewall to get to 4 screws you cant see or get to with it on the truck.
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Old 12-10-2011, 08:56 PM   #9
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Re: 64 heater box

Quote:
Originally Posted by chainsaw View Post
On my 65, I had to remove it from the firewall to get to 4 screws you cant see or get to with it on the truck.
I found those today. I will have to pull the entire thing out.

Thanks.
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Old 12-10-2011, 09:23 PM   #10
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Re: 64 heater box

I was suprised by how many screws they used to hold it together. Seems like they could have cut the number in half.
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Old 12-10-2011, 09:24 PM   #11
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Re: 64 heater box

Thats what i was thinking.
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Old 12-30-2011, 10:52 AM   #12
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Re: 64 heater box

I am having the same problem. I removed every screw i could see. I just found the ones on the inside of the cab through the firewall, did you get yours off after removing those??
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Old 12-30-2011, 09:05 PM   #13
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Re: 64 heater box

Pull off the 2 or 3 bolts from inside, then remove the whole unit from the engine compartment. Then you will see the rest of the screws.
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Old 12-30-2011, 09:56 PM   #14
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Re: 64 heater box

I see that the topic is the heater core. Mine isn't working too good neither. Do I have to replace the entire box and core or do I have to just open the flux capacitor and replace the core itself?
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Old 12-31-2011, 09:22 AM   #15
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Re: 64 heater box

probably full of junk, take it out clean it and boil it out.
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Old 12-31-2011, 09:33 AM   #16
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Re: 64 heater box

I'll do that dthela. Boil it out with what? How do I do that?
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2005 GMC Yukon XL Denali w/Mangnaflow Exhaust
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Old 12-31-2011, 11:39 AM   #17
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Re: 64 heater box

Quote:
Originally Posted by Classic64 View Post
I am having the same problem. I removed every screw i could see. I just found the ones on the inside of the cab through the firewall, did you get yours off after removing those??
Yes it did.
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