I now have my engine out and everything had seemed to be working prior to teardown. I’m going to clean up what I can while I have the chance in the engine compartment. However, I found a piece of duct tape covering a grommet hole that I can’t figure out what it is intended to support. So this also makes me concerned about what else may have been “altered” over 45 years. Does anyone know of or have a diagram to help identify where vacuum hoses, heat hoses, a/c, and wiring should be mounted and travel through the firewall? The next best would be any pictures showing these connections and routings. Seems that all of my web searchs end up showing beautiful compartments with a sweet engine covering up exactly what I need to be able to see. Any help or directions towards good resources would be greatly appreciated. Thanks Oh BTW, I have a 68, 302, a/c, ps auto.
Here is my 67, should be pretty identical to your 68.
A/C and heater. Bolts are from the mount brackets for heater box. I believe the two empty holes are for non A/C heater core?
Here the large empty hole is throttle, I’m actually still not sure what that harness is for, but the single wire underneath is for the A/C compressor.
The main harness; lights, ignition, and charge are behind the booster between booster and fender well. The speedometer is under this harness. I have no other holes through my firewall…
Actually, if anyone can tell me what that harness above the A/C send line is for, I would appreciate it. There is a four wire, and three wire. I would assume some distributor leads, and maybe water temp and oil pressure?.
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The four wire plug is probably neutral safety switch/backup lamps (two red/blue and two black red wires); the three wire plug is the engine gauge feed plug: oil, temperature, and coil wires.
That is correct about the empty holes. They get a rubber plug in them from the factory when the car has factory A/C installed.
Randy Goodling
CCOA #95
I wish the quality was better, but maybe these will help
Before (shudder runs down spine)
Repro firewall (after)
Looks good man. Was this in a barn where the mice chewed holes in the shock towers like that? lol
These pictures are great. I took some pictures to help show what I have and what I am trying to figure out. A little about what I have learned so far. The car left the factory with no a/c. The second owner had a mechanic install a/c and a complete XR-7 a/c dash from a donor 68. The driver side firewall is where I have the hole (red arrow) that I have no idea what its use is. The green arrow has a vacuum line and a small wire bundle with a glob of sealant and right now I have no idea what these might be. The blue arrow is a bundle exiting about where shown. The second picture is the passenger side where the two plugs (red arrow) are for the non a/c heater hoses, right? The blue arrow is pointing to the correct location for heater hoses on an a/c car, right? The a/c connections circled are what really have me concerned. The last picture is looking down on the a/c connections at the firewall and looks like a huge glob of hard sealant material. What should this look like and should/can this be fixed?
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Driver side
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Passenger side
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A/C connections
This looks like some type of insulating material. Seeing that this is not a factory set up you have a couple of options.
A) Leave as is.
B) Upgrade to a factory A/C setup.
C) Dress is up with a product like Thermo-Shield.
Steven
This looks correct. The two holes are for non-A/C heater core. The A/C retainer plate (or whatever it is called) looks correct on yours, mine is a two piece metal cover plate that holds a molded rubber gasket/grommet over the hole in the firewall. As for the gunk over your lines, I also think it is some kind of insulation. As for the driver side pic, it is kind of hard to see what exactly I am looking at in that picture…
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Ok, so I figured out how to look at your pic in full Quality and my question is, where do the wires and vacuum at green arrow go? That single wire there just at that green arrow spot with the female push connector, that is for your A/C compressor lead. But there should be nothing else coming through that location. As far as the empty hole just to the side with red arrow, that looks like something PO drilled for some reason. It also should not belong, and you can cover it with appropriate sized rubber plug. As far as the blue arrow. That is the 2 harness lead I asked about in my first response which was said to be engine management of sorts. Oil pressure, electric choke, water temp, and things…
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I just realized you asked for resources to show vacuum lines etc. go to west coast classic cougar’s website, and look for their free resources downloads. They have a pretty decent vacuum diagram and wiring diagram that helped me through 99% of my wiring issues when reinstalling my harnesses. The other issues I’m having are being answered by the guys on here. Their vacuum diagram would have been a great help, but I’m getting rid of all my vacuum actuators and replacing with electrical ones since I plan on running a HUGE cam in my car…
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