Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

[William H.]

Hello All,
I am rebuilding the inner and outer Heat and A/C boxes on my 65 350 HP car. I was going to install a new heater core that I bought from the local Auto parts store it is part number 398212 It is Ready Air or Murry brand. Anyway when comparing to my old one it has one less row of fins. I would like to try to find a GM or Delco version but cant find a part number. When I look in my GM parts book it only lists the heater core for a Non A/C car. The delco website is no help either. I cross referenced the Murry number on the delco website and got two numbers 15-63335 and 15-60119. I found add for the 15-60119 and it is bigger so I am asuming that it is for A Non Air car. I cant find any pictures of the 15-63335 to compare it to my original.
I would really appreciated it if anyone has an older GM catalog that might list the correct number for my car. THen I can try and run one down. MY original one is leaking at the joint of the pipe and header so I may just try to get it fixed. Although it is a big job to replace it and Ive got it all apart now so putting in a GOOD new one doesnt sound like a bad ideal either. By the way there is a number on the original core 3004966 not sure if that is the GM number or what. I dont get any hits when I google it.
Thanks in advance
Bill

[Joe L.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Hello All,
I am rebuilding the inner and outer Heat and A/C boxes on my 65 350 HP car. I was going to install a new heater core that I bought from the local Auto parts store it is part number 398212 It is Ready Air or Murry brand. Anyway when comparing to my old one it has one less row of fins. I would like to try to find a GM or Delco version but cant find a part number. When I look in my GM parts book it only lists the heater core for a Non A/C car. The delco website is no help either. I cross referenced the Murry number on the delco website and got two numbers 15-63335 and 15-60119. I found add for the 15-60119 and it is bigger so I am asuming that it is for A Non Air car. I cant find any pictures of the 15-63335 to compare it to my original.
I would really appreciated it if anyone has an older GM catalog that might list the correct number for my car. THen I can try and run one down. MY original one is leaking at the joint of the pipe and header so I may just try to get it fixed. Although it is a big job to replace it and Ive got it all apart now so putting in a GOOD new one doesnt sound like a bad ideal either. By the way there is a number on the original core 3004966 not sure if that is the GM number or what. I dont get any hits when I google it.
Thanks in advance
Bill

Bill-----


The reason that you couldn't find the part in the GM catalog is that the heater core for 63-67 Corvettes with A/C was discontinued without supercession in April, 1973. So, if you looked at any P&A catalog published after that time, it would not show the core, at all. The part number was GM #3003935. As long ago as it was discontinued, I think you'll find it difficult, to say the least, to find one.

Delco may currently offer a core. However, if they do I would expect that it's exactly the same part as is available under other brands. At this point, I doubt if there is more than one manufacturing source, regardless of brand. However, it may be possible to have your original re-cored. Some radiator shops will do this and I understand that the core, less tanks, are available to radiator shops. Whether this core is any different in configuration than the ones that are part of the core assemblies currently available in the aftermarket I do not know.

[Keith B.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Take your original one to a old time radiator shop and have it re-cored and tested. Much better then off shore parts

[Joe L.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Take your original one to a old time radiator shop and have it re-cored and tested. Much better then off shore parts

Keith-----


Keep in mind that if one is able to have the core assembly re-cored, all one is preserving is the tanks. These are really a small part of the overall assembly but, of course, worth preserving, if possible. The core, itself, will likely be no different than that used in the aftermarket assemblies and will very likely be an off-shore product. As a matter of fact, as far as the complete aftermarket assemblies go, I'd be a lot more concerned about the quality of the core than about the quality of the tanks and one will not get away from that with a re-core.

On the plus side, the original tanks often differ in small ways from the aftermarket tanks and, thus, the aftermarket assemblies sometimes do not fit the heater box without some modification. On the negative side, if the replacement core differs from the original in even minor ways, the re-cored unit will still not fit properly in the heater box. Also understand that there is likely not a replacement core available that will be dimensionally identical to the original.

[David L.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

GM # 3003935 is the part number for a replacement 1963-1967 heater CASE (not heater core).

Heater core # 3004976 is listed in my 1965 and 1966 Chevrolet Parts Catalogs (10/64, 1/65, 5/65, and 10/65) for 1965-1966 Corvettes w/AC.
GM # 3004976 was replaced with GM # 3008575 in May 1966 as per Chevrolet Parts History.

I assume the difference between a 3008575 and a 3008574 heater core is the inlet tube and the outlet tube.
Below are photos of a NOS 1967 3008574 heater core (replacement for 3004977, 3000057, and 3157457) that I purchased in 1995.
My NOS 3008574 core measures 8 7/8" X 6 1/16" X 2 1/2". According to the web the Ready Aire 398212 core measures 7 3/4" X 6 3/8" X 2 1/2".

Dave

[Joe L.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

GM # 3003935 is the part number for a replacement 1963-1967 heater CASE (not heater core).

Heater core # 3004976 is listed in my 1965 and 1966 Chevrolet Parts Catalogs (10/64, 1/65, 5/65, and 10/65) for 1965-1966 Corvettes w/AC.
GM # 3004976 was replaced with GM # 3008575 in May 1966 as per Chevrolet Parts History.

Dave

Dave-----


Yes, you're correct; I erred. GM #3004976 was the original part number for the 1965 Corvette with A/C heater core and it was replaced by GM #3008575 in May 1966. GM #3008575 was discontinued without supercession in March, 1974.

[John H.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Bill -

I needed one in 1973 to finish the restoration of my '65 A/C tanker, and there were no GM cores left in the system (and the aftermarket hadn't picked up on it yet). I finally got an original Engineering sample core, dug out of the Harrison warehouse, from the Harrison rep that visited our plant.

[James W.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Bill,

I replaced the original heater core in my '65 A/C equipped coupe about 5 years ago with a replacement heater core from Paragon, p/n 12329. My original core was leaking at the same place as you decribed plus starting to show seapage in the fin areas. The replacement I bought and installed fit just fine and works great. As you have realized replacing a heater core on a midyear Corvette is job you do not want to repeat anytime soon. I would recommend that you go the route of the replacement and save your original and put on the shelf with any other original parts from your care that you want to keep.

***I would also recommend that you take the replacement heater core to your local radiator repair shop and have them put additional solider on the inlet and outlet pipe sweated joints and also have them perform a leak check. The last thing you want to do is take it apart again!!!


Best Regards,

James West
Omaha, NE.

Hello All,
I am rebuilding the inner and outer Heat and A/C boxes on my 65 350 HP car. I was going to install a new heater core that I bought from the local Auto parts store it is part number 398212 It is Ready Air or Murry brand. Anyway when comparing to my old one it has one less row of fins. I would like to try to find a GM or Delco version but cant find a part number. When I look in my GM parts book it only lists the heater core for a Non A/C car. The delco website is no help either. I cross referenced the Murry number on the delco website and got two numbers 15-63335 and 15-60119. I found add for the 15-60119 and it is bigger so I am asuming that it is for A Non Air car. I cant find any pictures of the 15-63335 to compare it to my original.
I would really appreciated it if anyone has an older GM catalog that might list the correct number for my car. THen I can try and run one down. MY original one is leaking at the joint of the pipe and header so I may just try to get it fixed. Although it is a big job to replace it and Ive got it all apart now so putting in a GOOD new one doesnt sound like a bad ideal either. By the way there is a number on the original core 3004966 not sure if that is the GM number or what. I dont get any hits when I google it.
Thanks in advance
Bill

[William H.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

DaveThis looks just like the Ready Aire replacement! My original has the number 3004966 stamped on the end tank with the inlet and outlet and on the other end it is stamped Harrison at the top and 64H at the bottom. I will post photos of it and the Ready Aire side by side for comparison. It looks to me like the NOS Delco unit you have is made by the same people as the Ready Air. The original core and the new Ready Aire are just about exactly the same sixe. The main difference is in the number of tubes with 16 on the ready Air and 17 on the original Counting the top and the bottom ones which look to not actually be tubes. Also the tank on the end opposite from the inlet seems to be deeper on the replacement. The number of fins per inch seems to be the same. I may take my original core to the radiator shop and see if they can just fix the tube to tank junction and keep the core as I don't think there is actually any leak in the core. WIll have them pressure test the old and the new one too as was advised previously. Thanks for everyones help.
Bill

[William H.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Hello again Dave posting photos of the measurements on my original core.
The Ready Aire is identical in it's measurements. With the exception of the overall lenght, including the tanks, because the Ready Air has one tank that is deeper. ( See pictures in my previous post for comparison.) The measurements that I got are 7 3/4" X 2 3/8" X 6 1/4" for the core and the length including the tanks is about 9" Notice how the inspection sticker on the Ready Aire is very simular to your NOS Core? I'm not Sure why the meassurements on your NOS core and these two are so different unless the NOS core is for a Non Air Car? Or did you include the tanks in your length measurement? Maybe that is why the part number is off by 1? The tubes look pretty much the same to me.
Hope this will help somone else.
Bill

[Joe L.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Hello again Dave posting photos of the measurements on my original core.
The Ready Aire is identical in it's measurements. With the exception of the overall lenght, including the tanks, because the Ready Air has one tank that is deeper. ( See pictures in my previous post for comparison.) The measurements that I got are 7 3/4" X 2 3/8" X 6 1/4" for the core and the length including the tanks is about 9" Notice how the inspection sticker on the Ready Aire is very simular to your NOS Core? I'm not Sure why the meassurements on your NOS core and these two are so different unless the NOS core is for a Non Air Car? Or did you include the tanks in your length measurement? Maybe that is why the part number is off by 1? The tubes look pretty much the same to me.
Hope this will help somone else.
Bill

Bill------

The heater core shown in Dave's post is, indeed, for a non A/C 63-67 Corvette application. In addition, that core is not a Harrison-manufactured piece as were the originals and SERVICE pieces available for quite a few years. The core that Dave pictured is, essentially, an aftermarket piece in a Delco box. That's also why the inspection stickers are similar because it likely came from the same manufacturing source. As I mentioned previously, when sales volume of a part gets low, manufacturing consolidation occurs. At some point, it gets down to a single manufacturer and I expect for these cores that point was reached a long time ago. Of course, it may be available under several different brands but the manufacturing source is the same. At some future time it could get down to ZERO manufacturers and you know what that means.

Also, there is a difference in the configuration of the 63-67 with A/C and without A/C cores. It's not just a matter of the tube configuration. Among other things, the with A/C heater core is shorter than the without A/C core. Tube configuration is a common "only difference" between with A/C and without A/C cores. However, in this case, it's more than that.

[William H.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Hello Joe,
One other difference I noted was that the NOS Non AC core has 15 tubes, The reproduction AC core has 16 and the original AC core has 17. I'm including a few more photos. One of the part number tag on the Repro AC Core. I'm Curious about the other numbers on it. Could the PWO: number 1022922 be a GM part number? and the Ref: H40G be a Harrison model number for the basic core layout.
Another is a Photo of my car since I've never posted it. And a couple of the Inside ac box since it is original and unmolested. I have some more of it if anyone is interested.
Thanks again,
Bill

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[Joe L.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Hello Joe,
One other difference I noted was that the NOS Non AC core has 15 tubes, The reproduction AC core has 16 and the original AC core has 17. I'm including a few more photos. One of the part number tag on the Repro AC Core. I'm Curious about the other numbers on it. Could the PWO: number 1022922 be a GM part number? and the Ref: H40G be a Harrison model number for the basic core layout.
Another is a Photo of my car since I've never posted it. And a couple of the Inside ac box since it is original and unmolested. I have some more of it if anyone is interested.
Thanks again,
Bill

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Bill-----

1022922 would not be a GM part number for a heater core. I don't think that H40G would be any sort of a Harrison number. For one thing, there's no way that this core was manufactured by Harrison.

[David L.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Bill,

Just to clarify, my NOS (or NORS) 3008574 non-AC heater core measures 8 7/8" X 6 1/16" X 2 1/2" with 15 "tubes". The overall length measures 10 1/8" long. It has two inspection stickers (one on top of the other) and two ink stamped date codes, Feb. 24, 1995, and Apr. 4, 1995. The red-white-blue Delco label has "HARRISON DIVISION GMC" and "LOCKPORT, NY 14094" but as Joe stated the core was not actually made by Harrison.

During the 1980-1995 frame-up restoration of my 1966 Corvette (Feb. 24, 1966) I noticed the embossed date code on my original non-AC Harrison heater core was "66 B" which matched the stamped date code on my supply tank but I did not record the embossed part number (at the time it was a rookie mistake).

Some day in the future I will replace my "66B" non-AC core with the NORS non-AC core as the "66B" core has a small leak so I disconnected the two heater hoses.

According to my recent research this is what I have found totally based only on 1963-1967 Chevrolet parts catalogs:

Heater cores wo/AC:
1963, # 3157457 (10/63 parts catalog)
1964, 1965, and possibly "early 1966", # 3000057 (10/63, 10/64 & 10/65 parts catalogs)
possibly mid production 1966, #3004977
"late" 1966-1967, # 3008574 (4/67, 7/67, and 10/67 parts catalogs)

Parts history: 3157457 to 3000057 in Jan. 1966 to 3004977 also in Jan. 1966 to 3008574 in Mar. 1966.

Heater cores w/AC:
1963-1964, # 3000647 (10/63 & 10/64 parts catalogs)
1965-1966, #3004976 (10/64, 5/65, & 10/65 parts catalogs)
possibly "late" 1966, 1967, # 3008575 (4/67 & 10/67 parts catalogs)

Parts history: 3000647 to 3004976 in Mar. 1966 to 3008575 in May 1966.

My 1963 Chevrolet Parts Catalog (10/62) does not list any heater cores for the 1963 Corvette.

The embossed part number on your original 1965 w/AC "64H" heater core is "3004966" (3004976 in 1965-1966 parts catalog).
Somewhere in my garage I have a "62M" heater core. When I have a chance I will see what the embossed part number is on it.

Dave

[William H.]

Re: Need Part Number for GM or Delco Heater core. 1965 Coupe with A/C

Hello right now on e bay there is an AC ( I think) heater core 3155362 dated 62M
Just fyi