My 66 Impala Heater Core Replacement - Impala Tech
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post #1 of 8 (permalink) Old 07-17-2011, 07:54 PM Thread Starter
Join Date: Jul 2011
Location: Denver, CO
Posts: 18
My 66 Impala Heater Core Replacement

This will be my 2nd started post, first was introduction. My heater core started leaking yesterday, so today i decided to bypass the core so if i wanted to still drive the car i could. It is my garage queen, but I still enjoy washing and driving it. I am having some heating issues, i'll start another thread for that.

Big Dave has been a lot of help also, and rather post in another persons thread i'd figure i'd start my own.

Car is a 66 Impala 2 dr with a 327 3spd on the column.

People have started in multiple thread that everything can be accessed from inside the car, so that is where i started.

1. Removed the glove box door by removeing the three screws on the bottom.
2. Remove the glove box inside liner by removing 4 screws (2 on top and 2 on bottom). The liner should just fall out (mine did). I had old crumbling insulation inside that just fell apart when i touched it, so i just threw it all out. It was ugly and messy!

Then i saw the head of 2 bolts on top and 3 on bottom of the "heater box" or whatever you call it. Notice there are no bolts accessible from the inside.

Then i headed to the engine bay, and sure enough there were 7/16" bolts! Only problem is there are only 4 that i can reach. The fifth one is on the bottom closest to the outside of the car. Unfortunately I can't even feel the bolt to try to access it. I measured the distance from inside and it will be nearly impossible to gain access without removing the inner fender liner.

Here is a pic from inside the car...

Any idea on how i can get to this? Or how to remove the inner fender liner? Or am i totally approaching this the wrong way?

Thanks in advance.
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post #2 of 8 (permalink) Old 07-17-2011, 08:06 PM Thread Starter
Join Date: Jul 2011
Location: Denver, CO
Posts: 18
Ok, I just realized how ugly these pics are so i am going to take some better pics.
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post #3 of 8 (permalink) Old 07-17-2011, 08:39 PM Thread Starter
Join Date: Jul 2011
Location: Denver, CO
Posts: 18
Two from inside looking through the glove box...

Three below, the one on the far right is the one in question...

Here is a shot from the engine bay... I drew in the circles to give an approximation of where they are located.

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post #4 of 8 (permalink) Old 07-17-2011, 10:11 PM Thread Starter
Join Date: Jul 2011
Location: Denver, CO
Posts: 18
Ok, a quick google search and I found this post. Poster says to drill out the lower right (hidden) stud. Seems like a shortcut way to doing it right.
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post #5 of 8 (permalink) Old 07-17-2011, 11:06 PM
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Hidden bolt

I believe the service manual shows you how to access that bolt. You do have to take out the lower fender skirt bolts and place a small 2x4 inside to keep the space wedged open, they you should have access. You may have to remove or loosen the hood mount on that side. Check the manual.



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post #6 of 8 (permalink) Old 07-18-2011, 01:00 AM Thread Starter
Join Date: Jul 2011
Location: Denver, CO
Posts: 18
yeah thats the problem. don't have a manual just yet, ordered a few online today. if someone has one and would like to scan/take a pic of those pages i'd appreciate it. If you need proof of my manual purchase, i'd be happy to provide that info. I'm not for getting free manuals online.
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post #7 of 8 (permalink) Old 07-18-2011, 10:08 PM Thread Starter
Join Date: Jul 2011
Location: Denver, CO
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Got it out today after work. Was laying in the engine bay with my right hand wedged between the inner fender and the firewall. A socket with take on the end for grip, a lot of swearing, sweating (its near 100 in Denver) and nearly rubbing off all my skin on my finger i was able to get that last bolt off.

Here are pics. Is this the stock 66 non-ss heater core? Im looking at my classic industries catalog and their heater core looks different.

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post #8 of 8 (permalink) Old 07-22-2011, 10:04 AM
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I wish I'd have read your post earlier - i coulda' saved you some skin off your knuckles. I did this just last year - it is a pain in the rump - but it'll be worth it in the end.

Yes, you have to at least loosen the inner fender well bolts ( I took mine completely out when I did mine ) to gain access to that obscured nut. "drilling it out" is NOT the way to do it (correctly). This is one of those instances where people might understand better about 'all that money' their mechanic is charging them for doing 'a simple heater core' - when you really see how much LABOR is entailed in actually getting one out!

If you old one has a stamping (or paint) on it that says "Harrison" or "Frigidaire" or something like that on it - it's probobly original. I think Harrison was the name of GM's A/C units back then.

Good luck!

'63 Impala Sedan
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