[socalsuv]

The passenger-side block coolant drain isn't really that hard to get to. I was able to weave my arm and small box wrench to the drain bolt without removing anything. As mentioned, make sure you attach a length of tubing to the spouts so you can direct the draining coolant.

With draining the radiator and both PS / DS block drains, I drained about 14 quarts out of the 16 quart capacity. I replaced it with the pre-mixed Toyota Super Long Life Coolant.

My only advice is to make sure you give the cooling system enough "burp" time (running the engine at 2k rpm with the radiator cap off). I apparently didn't do it long enough the first time and the engine got very hot and the heater wasn't blowing hot air. I immediately thought I had a bad thermostat. I took the new thermostat out to verify that it was functioning correctly (it was). I put the thermostat back in and re-burped the system and when the last puff of air was evacuated, I immediately got a blast of heat from the heater and the engine temp dropped. All was well. So, be safe and burp the system for longer than you think you need to. If you put in a new thermostat, may as well verify it works prior to putting it in.