vacuum hose in central console

[Alexander]

Am I correct that the left (red arrow) hose is the vacuum feed line from the vacuum reservoir at the back of the car to the mode switch?

What is the much thinner plastic hose on the right (yellow arrow). It was loose, or I pulled it loose removing the console

[Ron]

Yes, the one on the left is the mode switch's vacuum feed. The other one connects the mode switch to the water valve.

[Alexander]

.....The other one connects the mode switch to the water valve.

TNX! Can you clarify what the water valve hose does? Is it transporting water? Or transporting air temp in the hose? Where does it connect on the mode switch?

[DMCMW Dave]

TNX! Can you clarify what the water valve hose does? Is it transporting water? Or transporting air temp in the hose? Where does it connect on the mode switch?

It's a vacuum line to the hot water valve located at the back of the engine above the bellhousing. It turns the hot water off when selecting the MAX AC mode.

[Alexander]

It's a vacuum line to the hot water valve located at the back of the engine above the bellhousing. It turns the hot water off when selecting the MAX AC mode.

so if loose/disconnected like mine, it means the hot water will be 'on'?

[Ron]

TNX! Can you clarify what the water valve hose does? Is it transporting water? Or transporting air temp in the hose? Where does it connect on the mode switch?

so if loose/disconnected like mine, it means the hot water will be 'on'?

Yes.

When the mode switch is set to MAX Air, vacuum, from Port #3, goes to a tee. The tee feeds the re-circulation flap and the water valve. The flap prevents outside air from going through the cabin. The water valve prevents engine coolant from circulating through the heater core.

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[DMCMW Dave]

Yes.

When the mode switch is set to MAX Air, vacuum from Port #3 goes to a tee. The tee feeds the re-circulation flap and the water valve. The flap
prevents outside air from going through the cabin. The water valve prevents engine coolant from circulating through the heater core.

A long time ago I plumbed a medical vacuum valve into the line so that I could turn the water off manually. This way I could run the A/C in "normal" and still have the hot water off. No need for it in the summer.

[Ron]

A long time ago I plumbed a medical vacuum valve into the line so that I could turn the water off manually. This way I could run the A/C in "normal" and still have the hot water off. No need for it in the summer.

That's a lot better than my vise-grip-on-the-hose mod...J/K!

[Alexander]

thanks all for you help.