Tiny Mystery Hose in �73 Engine Compartment

[Floyd B.]

[George Romano]

[Floyd B.]

[Michael W.]

[Jack H.]

There are several hoses there.....

Three in fact. One line supplies raw vacuum to the cowl mounted wiper door control valve (runs along firewall from the LH side of the car). A second line runs through the grommet from the RH, fender mounted, wiper door actuator valve. A third line exits the grommet which terminates in a short/cut end. This is the cowl mounted wiper door control valve's exhaust vent. It's routed under the hood to protect against moisture intrusion.

On A/C equipped cars, a 4th vac line is in this general area (very small diameter hose) but it does not go in/out of the engine compartment. This is the vac control line for the exterior cowl vent makeup air control (does A/C system run by recirculating cabin air or use raw exterior ambient makeup air?).

[Jack H.]

That's a small hose....

that runs across the top of the Harrison air box and down to the back side of the RH inner fender area where the heater control valve 'lives' (on those Shark cars that used hot water cutoff control).

[Tom Freeman]

Re: That's a small hose....

The 73 did not have a hot water shut off valve.

tom...

[Tom Freeman]

Re: There are several hoses there.....

No wiper door in '73.

[Geoff C.]

Climate Control Hose schematics

[Roger S.]

[Harmon C.]

Re: That's a small hose....

Tom From what I think on a few 73's in my stable their is a special tee that the small hose hooks to. Easy to break off and hard to find locally. I think it then goes thru the firewall. Lyle

[Gary Bishop]

Great Diagrams!! *NM*

[Brian McHale]

Re: Great Diagrams!!

Spring for his catalog, it's loaded with great diagrams.

[Patrick H.]

[Reba Whittington]