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Discussion Starter #1
I'm installing factory a/c in my '70 Mach 1 during it's restoration; it didn't come with a/c originally. That being the case I'm not sure of which holes in the firewall serve which purpose now:

- Which hole is used for the grommet that holds the two vacuum lines that enter the engine compartment? Is it the one near the center above the lip that joins the cowl and firewall?

- Were the two heater hose holes cut on cars that were factory-equipped with a/c, and if so, are they plugged with a rubber plug? I've heard that they were plugged for '67s and '68s, but I'm not sure about the '69s and '70s.

- Is a grommet used in the hole that's cut for the evaporator drain hose?

Thanks in advance for guidance...
 

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i think i can take a few pics in the morning that might help you out...... i'll be in touch :0) jace
 

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i'm planning on the same swap sometime late next fall.i've read all the underdash wiring is there to hook uo factory AC stuff anywayshere are the pics i took.
1..the first is a pic of the firewall in my 70 mach (non ac)you can see the "stamp" where you will need to cut the hole in the fire wall.

2 is a pic of our 70 cougar(same as mustang) wiyh AC,in the upper right coner you can see the plugs are for the non AC heaters hoses where

3,4,5 are pics of the gasket and retainer the bolt onto the fire wall........... i hope this helps you some and if anyone sees something i said wrong please jump in :0)

http://a1.cpimg.com/image/3D/75/22113341-1d0e-028001E0-.jpg


http://a2.cpimg.com/image/3E/75/22113342-efd8-028001E0-.jpg

http://a3.cpimg.com/image/3F/75/22113343-3a62-028001E0-.jpg

http://a4.cpimg.com/image/40/75/22113344-a919-028001E0-.jpg

http://a5.cpimg.com/image/41/75/22113345-0dfb-028001E0-.jpg
 

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Discussion Starter #5
Thanks very much for the pics, but I need one more bit of info: where's the hole on the Cougar firewall where the two vacuum lines for the a/c come through? From what I see in the assembly manuals it should be somewhere near the center of the firewall, perhaps slightly to the passenger side.

You did say that the heater hose holes on the Cougar are plugged, right?

Is there a grommet on the hole where the evaporator drain hose passes through the firewall?
 

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IIRC, those vacuum lines do come from the center of the fire wall, just off center to the PS. If you look closely, you should see them just under the two Export Brace Bolts on the PS.

http://prod.bsis.bellsouth.net/coDataImages/p/Groups/81/81931/folders/43225/486198Mvc-384s.jpg
 

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Here are all the pics you should need. I got them off the internet over the years and I am converting to factory air as well. You'll also need to make holes on the fender apron for the vacuum can. There are dimples on the firewall to use as a guide for drilling the holes, which helps greatly !
Dave
http://spectrum-photo.com/acholes1.jpg
http://spectrum-photo.com/acholes2.jpg
http://spectrum-photo.com/acholes3.jpg
http://spectrum-photo.com/acholes4.jpg
http://spectrum-photo.com/acholes5.jpg
http://spectrum-photo.com/acholes6.jpg
http://spectrum-photo.com/acholes7.jpg
http://spectrum-photo.com/acholes6.jpg
 

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Discussion Starter #8
This is great -- thanks to all of you for all the help!
 
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