What's This Hole For? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BHTH · 12-05-2017, 03:17 PM

I've got a 1978 K5 Blazer with the Cheyenne package, there is a hole in the firewall almost directly in line with the transmission dipstick tube. It appears to be a factory hole with no grommet or plug. What's it for?

mcmlxix · 12-07-2017, 03:13 AM

AC truck or Non-AC truck?
I also have a 78 K5 that came with factory AC.
I can check to see what's there on mine....

BHTH · 12-07-2017, 11:07 AM

Quote:

Originally Posted by mcmlxix

AC truck or Non-AC truck?
I also have a 78 K5 that came with factory AC.
I can check to see what's there on mine....

It is a non-AC truck, and I lied, it does have a grommet and the interior firewall cover has a hole in it to expose the grommet.

BHTH · 12-13-2017, 04:22 PM

Backed this out to the square body forum with some pics.

http://67-72chevytrucks.com/vboard/s...51#post8104151

12-05-2017, 03:17 PM	#1
BHTH Registered User Join Date: Nov 2017 Location: Butler, PA Posts: 56	What's This Hole For? I've got a 1978 K5 Blazer with the Cheyenne package, there is a hole in the firewall almost directly in line with the transmission dipstick tube. It appears to be a factory hole with no grommet or plug. What's it for?

12-07-2017, 03:13 AM	#2
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	Re: What's This Hole For? AC truck or Non-AC truck? I also have a 78 K5 that came with factory AC. I can check to see what's there on mine.... __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE

12-13-2017, 04:22 PM	#4
BHTH Registered User Join Date: Nov 2017 Location: Butler, PA Posts: 56	Re: What's This Hole For? Backed this out to the square body forum with some pics. http://67-72chevytrucks.com/vboard/s...51#post8104151



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