Changing Coolant in a Solara

There is a drain in the radiator, at the bottom. Try again...

I wouldn't bother with the drain plug on the block if that's truly what you mean. I once lifted the car and opened the drain on the engine block after draining the coolant from the bottom of the radiator, and only a few more drops came out - clearly not worth the extra effort, since the drain plug on the block is awkward to reach. After several times lifting the car, and removing the plastic shielding under the radiator to access the radiator drain, discovered with a shop light, that you can reach it from above if you're careful, and loosen and tighten it with your fingers - much simpler. On mine, there's a hole in the plastic shielding beneath, and a short tube on the radiator drain to direct draining coolant through that hole.

I forgot to add, the engine is the V6. Maybe the drain plug is easier to access? Thanks for the response.