89 Suburban - Convert A/C to Non-A/C?

[Nick_R_23]

I picked up an '89 GMC Suburban the other day, with a blown 6.2L diesel. I'm planning on swapping in a 6.5L Turbo diesel from a 1994 Chevy truck. One problem I know that I'll run into is the fact that the turbo is going to hit the A/C box. I would like to swap out the box for just a regular heater box. I've done this swap before on a G-Body car and know what all is involved, but the firewall is the same for A/C and Non-A/C on the G-Bodies. Is this the same case on the 73-91 Chevy trucks, or are the firewalls different between A/C and Non-A/C equipped trucks?

[trickedout420]

i hate to say it but search there is a nice article explaining how to do it somewhere on here

[FordeatinZ71]

i'm about 99% certain the firewalls are exactly the same. the only differences are in the box itself and the HVAC ducting inside the cab (non A/C trucks didn't have dash vents) and obviously the control panel...

[Nick_R_23]

I've tried searching but suprisingly I can't come up with much. Even google only comes back with a few threads with vague posts on whether or not it is possible.

[richmond2000]

I have also had little luck on this and want to fit A/C in mine (the dash vents mostly)
a LINK to the thread would be awsome thanks

[GreaseDog]

i'm about 99% certain the firewalls are exactly the same. the only differences are in the box itself and the HVAC ducting inside the cab (non A/C trucks didn't have dash vents) and obviously the control panel...i'm 100% certain you're incorrect. i've done it. while not hard, you do have to block off part of the opening, and open up othe areas on the firewall. best way is to find your donor truck, and take all of the measurements you need from it, then make your plate and secure it, and reinstall the heater box.

[FordeatinZ71]

The firewall IS the same...the opening is different. I was referring to the contour and shape of it. So an opening has to be modified, big deal...