I believe that hole is for the temp cable.



I'd also like to add that whether the temp cable came out under the blower motor or under the brake booster in 1970 doesn't seem to be build date related. It's not an early vs late thing. My car happens to be an early car (8-26-69), but the other cars I know of that exit under the blower motor are pretty much spread out through the year, with plenty of cars built between them that have the cable exiting under the brake booster.

I'm not sure why they exited the through the firewall in two different places in 1970. It doesn't seem to have anything to do with build date, cuda vs. challenger, or transmission. I don't think it has to do with engine selection. Someone had suggested that manual drum brake cars had the exit under the blower motor, but that's been proven wrong twice now.

Any ideas, or info is appreciated.

Tav

Grommet in my car (1970 318 A/C) was mounted from inside - looking on a dirt, there was no cable when I bought the car but that grommet doesn't look like cable went through it, second opening in rubber nipple is quite tight

jorå,also my -70 cuda with under blower motor grommet,is a manual brake car.anyway its time to answer the question off stiffnes my original temp cable is with a stiff/solid inner wire,just like a lawn mower type of wire.and i think r.ehrenberg might have those on his e-båg web site.check it out he needs help with the alimony

I mount the firewall insulation pads and I noticed that my temp cable is routed through wrong hole, on the picture no1 are insulation clip holes, where should go temp cable? and what are holes 2,3,4 for?

washer foot pump & hoses?

Your temp cable is going through the correct hole. It replaces one of the insulation pins.

Hole 2 is used for the grommet that the manual windshield washer hoses pass through, or is plugged with a body plug if you have an electric windshield washer pump.

Hole 3 is for the clutch rod on a manual transmission, or is plugged with a body plug if you have an automatic transmission.

Holes 4 are for the manual windshield waher foot pump, and would be undrilled dimples if you had an electric windshield washer pump.

Tav

thanks
It had manual washer pump

I heard about another car belonging to GKMOPAR that had the grommet for the cable that comes through under the blower motor.
It's a December 1969 car with manual drum brakes.

Tav

My 1970 Challenger Dec 1969 build date has the grommet mounted on the inside. Gerry

70 barracuda SPD 9-11-69 with the grommet mounted on the inside...Power disc and cruize control...And I may have run my cable in the wrong routing...I've got it running out by the booster but the AC box has the clip that would have held the cable for the inside routing....In any event, It is the best routing now because of the header clearance...