Vacuum hoses

[c23racing]

Could anyone tell me which hose is the vacuum supply for the a/c. Purple or gray?

 

[69hurstolds]

*sigh* Because there are pretty much no other colors you need to worry much about under the hood, I'll answer this one.

On a typical G-body, Gray goes to the water cutoff valve. Purple goes to the manifold vacuum.

 

[nycutlass]

*sigh* Because there are pretty much no other colors you need to worry much about under the hood, I'll answer this one.

On a typical G-body, Gray goes to the water cutoff valve. Purple goes to the manifold vacuum.

69hurstolds is the gray water cutoff valve controlled by the inside levers ?

 

[c23racing]

Thanks. That’s what I thought it was but I’m just wanted to make sure 👍

 

[69hurstolds]

Yup. I haven't looked at it in 100 years, but basically, when you go from cold toward hot (as soon as you come off COLD) with the temperature lever, it applies vacuum or releases vacuum to the valve depending on the setup to open the valve to allow water to flow through the heater core. When you are in MAX or all the way COLD position with the A/C, the valve applies/releases vacuum to close the valve to stop flow through the heater core.

 

[nycutlass]

Thank you