Coolant type?

My coolant reservoir has the pink "Japanese" original coolant. (170,000) I don't recall ever draining and replacing my radiator coolant. Coolant is not discolored, looks fine.

Question(s): When topping off my reservoir I have been using "Universal" Coolant now and then.
Is this OK or should I only use "Pink Japanese" coolant?

Should I drain and replace my coolant at 170,000 miles?

Lately I feel like I'm getting warmer than usual air coming into the cabin via the vents. Idiot gauge never goes past 1/2 way Hot/Cold

 

Drain and replace with the recommended type.

 

I don’t like mixing coolant brands.
If I do, I try to use the pink universal “Asian vehicles” type.

I would definitely do drain and refill on the system. It’s not particularly hard, and these engines aren’t know to air lock.

 

Top offs indicate there may be a problem, as it's a pressure sealed system and should not really have any loss.

While nice, it's not a good measure of the value of the coolant in terms of protection. An inexpensive coolant tester is a good thing to consider.

I would.

 

I went down the coolant rabbit hole once. Coolant color vs type vs compatibility vs life. Long story short it was much easier to just go to the dealer and buy 2 gallons of premixed Toyota pink SLLC. No questions with compatibility at that point.

Also, by the book coolant is 100k mi / 10 years. And then every 50k / 5 yr after that. So yes probably worth doing

 

Yes you are way overdue for a drain and fill. That's how you get scale and particle stuff in the system, possibly clog the heater core

 

Drain rad and passenger side block (driveside wont be worth it at that point)

Fill with some of this

https://www.walmart.com/ip/Zerex-As...eze-Coolant-50-50-Ready-to-Use-1-GA/144057949