Where do you reattach the vacuum hose that controls heater on a 97 Chevy Astro van?

The vacuum hose for the heater control on a 1997 Chevy Astro van is part of a larger vacuum system. There isn't one single reattachment point. The hose connects to a component within the HVAC system under the dash, and *which* component depends on what the hose controls (e.g., blend door, recirculation door).

To find the correct location, you need to:

1. Identify the broken hose: Determine exactly *which* hose is disconnected. Take a picture before disconnecting anything. Note where it came from and what it controlled.

2. Trace the hose: Follow the hose's path. It likely originates from a vacuum source (possibly near the intake manifold) and goes through several connections before reaching the heater control. You're looking for a fitting that matches the hose's diameter and shape.

3. Consult a repair manual: A Haynes or Chilton repair manual for a 1997 Chevy Astro van will have diagrams of the vacuum system. This is essential for proper reassembly. The diagrams will show the routing of all vacuum lines and where they connect.

4. Look under the dash: The actuator for the heater blend door (which controls the mix of hot and cold air) is usually located under the dashboard, near the HVAC unit. The vacuum hose connects directly to this actuator.

Warning: Working on the vacuum system requires care. Improper reassembly can lead to malfunctioning heater controls or other issues. If you're unsure, it's best to consult a mechanic. The vacuum system is often fragile and easily damaged.

Without knowing which specific hose is detached, providing a precise location is impossible. Use the steps above to diagnose and repair the issue correctly.