What is the bolt size for thermostat of a 2000 dodge ram van 1500?

There's no single "bolt size" for a 2000 Dodge Ram Van 1500 thermostat. The size depends on the engine. Dodge Ram 1500 vans from that year could have several different engines (e.g., 3.9L, 5.2L, 5.9L). Each engine will have a different thermostat housing and therefore different bolt sizes.

To find the correct bolt size, you need to:

1. Identify your engine: Check your vehicle's documentation or the engine block itself for the engine displacement (e.g., 3.9L, 5.2L, 5.9L).

2. Locate a parts diagram: Once you know the engine, find a parts diagram online (many auto parts websites offer these) specific to your year and engine. The diagram will show the thermostat housing and the bolt sizes.

3. Remove the old thermostat: This is the most definitive way. When you remove the old thermostat, you can directly measure the bolt size with a caliper or compare them to a bolt size chart.

Without knowing your specific engine, it's impossible to give you the correct bolt size.