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1970 Heater core replacement

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Old Oct 16, 2005 | 09:56 AM
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Default 1970 Heater core replacement

I got a question about a heater core replacement. I have a 1970 without air. How hard is it to replace the heater core on this? Can it be pulled from the engine compartment? Or does it have to go thru the interior?
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Old Oct 16, 2005 | 09:58 AM
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Originally Posted by 70Donnybrooke
I got a question about a heater core replacement. I have a 1970 without air. How hard is it to replace the heater core on this? Can it be pulled from the engine compartment? Or does it have to go thru the interior?

Sorry, wrong forum. I think this is supposed to be in Tech.
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Old Oct 16, 2005 | 10:01 AM
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I pulled mine through the engine compartment. Was not too bad of a job if you don't mind standing on your head to get at some of those nuts on the heater box.

One thing and I am sure you know this already, be careful when putting your heater hoses back on the core. Damage can be done to the core at this time. That is how I killed my original heater core and didn't find it till I was breaking in my new engine.
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Old Oct 16, 2005 | 10:02 AM
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Originally Posted by 70Donnybrooke
I got a question about a heater core replacement. I have a 1970 without air. How hard is it to replace the heater core on this? Can it be pulled from the engine compartment? Or does it have to go thru the interior?

Easy job...remove the cover from the engine bay and the core will be exposed...

Are you buying a new one? I'd suggest you take your old core to a rad shop. They will recore it and use your existing tanks...guaranteed a perfect fit.

I bought a GM replacement, tore my hair out trying to make the clips fit, Had it recored, went in as snug as a bug in a rug....
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Old Oct 16, 2005 | 10:07 AM
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Originally Posted by Eddie 70
I pulled mine through the engine compartment. Was not too bad of a job if you don't mind standing on your head to get at some of those nuts on the heater box.

One thing and I am sure you know this already, be careful when putting your heater hoses back on the core. Damage can be done to the core at this time. That is how I killed my original heater core and didn't find it till I was breaking in my new engine.

I did not know that. How can it be damaged? Is it by pushing on the hoses?
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Old Oct 16, 2005 | 10:51 AM
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The brass is soft and quite thin. It is easily bent. And the solder joints are sensitive also. Use a non-petroleum lube (e.g. butter) when installing the hoses.

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Old Oct 16, 2005 | 11:32 AM
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So, would it be best to get mine repaired than to get a new one?
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Old Oct 16, 2005 | 02:42 PM
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Great timing! I was just getting ready to pull the dash to replace my 71 no A/C car. You mean you can get it out the front! That is why I love this place!
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Old Oct 16, 2005 | 06:49 PM
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How does the box come off? I took all the nuts off and it will not budge. I am afraid I will break it. I tried to pull up from the bottom but it is on good.
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Old Oct 16, 2005 | 07:12 PM
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OK, I spoke to soon. I got it off. Now I am stuck on the core. I got the one clip off. Is there another, or should it just pull out now?
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Old Oct 16, 2005 | 08:43 PM
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well, I worked on it for an hour. I tried and tried to get the core out. Then I pried one more time and it came right out. Now I got one more question. When you took off the motor side. I had a wire mesh over the fan. Is that supposed to be there? I think it looks bubba. I can post pics if you are unsure what I mean.
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Old Oct 17, 2005 | 09:46 AM
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I don't remember a wire mesh.

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Old Oct 17, 2005 | 09:49 AM
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Farmer,
It looks something like this. I have done that job twice.





The patient is on the right.


Last edited by Paul L; Oct 17, 2005 at 09:54 AM.
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Old Oct 17, 2005 | 10:55 AM
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I have the engine out so it was easy for me to remove the heater fan housing. (I don't have AC). I stared at the heater core for a long time, and it just didn't seem like it would come out from the engine side. I have a 68 Vert. Basically, the heater core looked to be bigger in dimensions that the opening (hole) in the firewall.

After reading about all of you replacing the core from the engine side, I'll remove the fan housing one more time. I'll try pushing the core back into the car, tilting it sideways and then try to pull it out. I'm apprehensious that 68's may be different and maybe you can't remove the heater core from the engine side on a 68?
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