Why is there just warm air coming out of the vents instead of hot air on a 97' astro?

If your 1997 Astro van is only blowing warm air instead of hot air from the vents, it could be due to several issues. Common causes include a low coolant level, a faulty thermostat, or a malfunctioning heater core. Additionally, problems with the blend door actuator or the heater control valve can prevent the proper mixing of hot air. Checking these components can help diagnose and resolve the issue.