72 Mach 1 - 351C - What goes through this hole in the firewall?

7173Mustangs.com

Help Support 7173Mustangs.com:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

bdennis

Well-known member
Joined
Apr 3, 2021
Messages
237
Reaction score
132
Location
Melbourne, Australia
Guys,

Any clues what goes through this hole in the firewall? I noticed it when I removed the shocker tower supports while replacing the front shock absorbers in my 72 Mach 1.

My car is a California build so has all "California Emission System" installed, so heaps of extra wiring etc. I also have a stray brown wire on the engine that I suspect should go through this hole.

The top arrow shows where the shocker tower support bracket bolts to the firewall. So the hole / what ever goes through it cant easily be seen.

The left arrow is the hole I'm talking about.

Any advice would be appreciated. 

Hole in FW.jpg

 
My best guess is for the vacuum hoses for the distributor modulator system. Do you have the thermal sensor on the passenger door A pillar?

 
A quick look at my 73 Coupe shows a rubber plug with a brownish wire coming out and connecting to the harness on the driver side of the engine behind the carb accelerator cable bracket. 

 
Does the car have air cond ? Or DID it have a/c ?  I'm picking the brown wire would be connected to the compressor drive and activates the magnetic clutch when the a / c is turned on.   Yes, there was a rubber grommet to secure it through the firewall.  If it is ( was ) the wire to the a /c compressor, the other end will have a black plastic female plug and be beside the left side rocker cover, near the PCV / oil filler cap.

More mysteries.

PKJ

 
Thanks guys.

No the car has not and does not have AC..

Looking at the pictures from David, the hole is in a slightly different location.

There is a brown wire on in the loom on the engine that looks like it has been pulled from somewhere. I suspect thats the one, I will need to pull the glove box shell out and see what I can see.

I probably need a H code California emissions, no AC car to be able to figure it out.

Thanks for the info thus far though. Most appreciated. 

 
Back
Top