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Old 02-11-2018, 02:29 AM   #1
B. W.
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Non-A/C Cab to A/C cab question

I'm converting a non-A/C cab to factory air. Did a search but couldn't find any info. There are three holes I need to drill in the firewall. One for the blend door cable, one for the vacuum lines and one for the top heater hose.

Does anyone know the size of these holes?

Are those grommets reproduced?

If someone could measure these I sure would appreciate it. Thanks!
(borrowed pic from a forum member. Sorry, don't know who or I'd give you credit!)
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Old 02-12-2018, 11:50 AM   #2
B. W.
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Re: Non-A/C Cab to A/C cab question

C'mon guys! It's cold outside, there's nothing better to do. Stumble out to the garage & measure some holes for me!
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Old 02-12-2018, 12:29 PM   #3
randy500
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Re: Non-A/C Cab to A/C cab question

The hole sizes and locations are in the assembly manual I think.
The 2 openings in the firewall behind the outside heater box are a different size and shape for A/C, they can be cut out to match A/C size and shape though.
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Old 02-12-2018, 01:39 PM   #4
B. W.
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Re: Non-A/C Cab to A/C cab question

Thanks Randy, I've got the large hole for the box figured out, I believe the hole locations for the vacuum lines & the cable are marked with dimples, I just wondered what size to drill them.

I haven't bought an assembly manual yet, haven't been far enough along to need it. Guess I am now. I did see the recent thread on CD vs paper, put a CD in the Amazon cart.
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Old 02-12-2018, 02:14 PM   #5
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Re: Non-A/C Cab to A/C cab question

Quote:
Originally Posted by B. W. View Post
Thanks Randy, I've got the large hole for the box figured out, I believe the hole locations for the vacuum lines & the cable are marked with dimples, I just wondered what size to drill them.

I haven't bought an assembly manual yet, haven't been far enough along to need it. Guess I am now. I did see the recent thread on CD vs paper, put a CD in the Amazon cart.
Ok, hole on the left for the cable is .825
The other for the wiring and vacuum line is 1.00
Both measured with digital caliper on an original firewall.
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Old 02-12-2018, 03:45 PM   #6
B. W.
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Re: Non-A/C Cab to A/C cab question

Randy you rock!! Thanks a lot!
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Old 02-12-2018, 05:23 PM   #7
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Re: Non-A/C Cab to A/C cab question

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Randy you rock!! Thanks a lot!
Your welcome.
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