Advice on Coolant change

No, just leave the rad cap off so it can burp out any air

 

If you want to completely flush the coolant system you must open the block drains.

When I recently drained & flushed my coolant system (4.0L 1GR-FE,) out of the total amt drained from the system more than 60% of the used coolant came out of the block drains. Only 40% from the radiator petcock valve.

Here's a long post w/ photos detailing my experience doing this:

https://www.tacomaworld.com/threads...olant-level-right.789685/page-2#post-28299332

 

When I did my first coolant change at 100K, I first drained pass side. When I opened the driver side, hardly any coolant drained, less than a quart, I’m guessing. Same thing at 150K. At 200K I didn’t bother with driver side. That side is hard to access anyways with the tire on; so, no more driver side draining for me. I will continue to always do a flush cycle with distilled water to help flush out sediment.

 

Thanks everyone on the advice, I greatly appreciate it!

 

If the coolant is really clean don’t waste your time draining the block. Do a drain and refill every 30k (super conservative) or every 60k and you’ll be fine.