Where is the thermostat located on a 1986 Chevy Astro van?

The thermostat on a 1986 Chevy Astro van is located under the intake manifold. This is a common location for vehicle thermostats. To access it, you'll need to remove the intake manifold, which is a significant undertaking requiring mechanical skills and the right tools. It's not a simple job for the average DIYer.