AC firewall cut outs in a non-AC cab? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rod · 07-08-2002, 12:08 AM

So what do people do about AC firewall cut outs in a non-ac cab. You just recut to fit or what? The non ac cab is a little larger cut outs but in different places.

**jerry moss** · 07-08-2002, 12:39 AM

Rod,
we have done a couple of non air to air swaps. i use the section of firewall from an a-c truck and pop rivit it in place with some sealer behind it. once you bolt on the underhood suitcase it covers up everything. we then slice the dash underneath the dashpad, unbolt the ends and install the dash from a factory a-c truck. when all is done it looks 100% original.

Low69CST · 07-08-2002, 12:45 AM

Friend of ours cut the firewall out of an A/C truck and I used that to make a pattern.

The pic is of my firewall. It use to be a heater only truck. You can see where I ran the Saber saw around the hole to the left and cut up the upper portion of the hole. This left hole is the only one that needs to be enlarged. The hole doesn't have to be as big as I have mine, just I had it painted so I didn't weld a piece in where I didn't need it. Also, if you look at the top left of the firewall, you'll see a hole in the firewall and a dimple above it. You need to cut a hole there for the heater core ends to come out. There is also a 3/8th inch hole in the top right that has to be welded up, then 4 different 3/8th inch holes drilled in the fire wall. Then another hole, about an inch, drilled in the engine well, the part that curves in the center of the cab. There is also a dimple there locating the hole for you. Thats the only things that I've found so far to cut on the firewall. If you have any more questions, feel free to PM or email me.

Marshall

Blue68 · 07-08-2002, 12:50 AM

OR, you go with an aftermarket a/c setup that will work in your non-a/c cab.

07-08-2002, 12:08 AM	#1
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	AC firewall cut outs in a non-AC cab? So what do people do about AC firewall cut outs in a non-ac cab. You just recut to fit or what? The non ac cab is a little larger cut outs but in different places. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

07-08-2002, 12:39 AM	#2
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,791	Rod, we have done a couple of non air to air swaps. i use the section of firewall from an a-c truck and pop rivit it in place with some sealer behind it. once you bolt on the underhood suitcase it covers up everything. we then slice the dash underneath the dashpad, unbolt the ends and install the dash from a factory a-c truck. when all is done it looks 100% original. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

07-08-2002, 12:45 AM	#3
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	Friend of ours cut the firewall out of an A/C truck and I used that to make a pattern. The pic is of my firewall. It use to be a heater only truck. You can see where I ran the Saber saw around the hole to the left and cut up the upper portion of the hole. This left hole is the only one that needs to be enlarged. The hole doesn't have to be as big as I have mine, just I had it painted so I didn't weld a piece in where I didn't need it. Also, if you look at the top left of the firewall, you'll see a hole in the firewall and a dimple above it. You need to cut a hole there for the heater core ends to come out. There is also a 3/8th inch hole in the top right that has to be welded up, then 4 different 3/8th inch holes drilled in the fire wall. Then another hole, about an inch, drilled in the engine well, the part that curves in the center of the cab. There is also a dimple there locating the hole for you. Thats the only things that I've found so far to cut on the firewall. If you have any more questions, feel free to PM or email me. Marshall __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

07-08-2002, 12:50 AM	#4
Blue68 Registered User Join Date: Apr 2000 Location: Frisco, Tx, USA Posts: 606	OR, you go with an aftermarket a/c setup that will work in your non-a/c cab. __________________ http://home.comcast.net/~r.landrum/w...tos.html-.html '68 C-10 LWB, '98 Z-71 350 w/accessories (Serpentine), Edelbrock Performer, Edelbrock 1405 (600cfm) carb, GM HEI, CompCam Extreme 4x4 roller cam, Thorley Headers, Carter Electric Fuel Pump, Vintage Air, 700r4, 3.73, disc brakes and power steering upgrades.



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