DIY Coolant Service Question & Advice needed.

Question yall:
For a DIY Coolant Service, should I just perform a drain from the drain plug & reservoir and refill w/o draining from the block (the 2 drain bolts near each wheel well) OR do I need to drain the block as well? I'm nervous about those two small bolts near the block. Thanks In advance.

 

Just drain the radiator.
Drive a week and do it again and maybe even one more time.
Than don’t worry about it again for 5 plus years.

 

Thanks. Will do.

 

Drain and fresh refill.

 

this is what I do. Every other oil change (~8k oci) I do a fresh gallon.

 

Drain and fill the rad..that's all I do..Oh...I do use toyota coolant..

 

You can. I did once.

after that I do the radiator. Like when I did the water pump. My upcoming denso rad replacement plan is use 2 jugs. Drain from rad. Doesn’t need more than that given its history.