I found this on Toyota Nation Forum: "Yes, it should take an engine 5 to 10 mins. to get to operating temperature, 190deg in your engines case.
If it takes longer then
thermostat needs to be replaced, for sure.
The thermostat controls the minimum operating temperature of an engine.
So I would drain coolant, reuse if not too old, and change thermostat, make sure new thermostat has a "jiggle valve", and you install it with "jiggle valve" at the 12:00 position.
A "jiggle valve" is a hole in the t-stat plate that allows air to escape when refilling the cooling system, it has a metal pin in the hole that "jiggles" to prevent hole from being blocked by debris, which is why it is called a .............jiggle valve
Green coolant needs to be changed every 2 years.
Red coolant needs to be changed every 5 years.
Do not switch from Green to Red or Red to Green, stay with what you have, which should be Red/Pink.
The
anti-freeze component in coolant never wears out, the anti-corrosion compounds do, which is why it is important to change coolant when specified.
Back flushing the heater core is always a good idea, the heater core has the smallest passages in the system, so any debris will find its way there and if large enough stay there, over time the core passes less hot coolant so max. temp inside car can go down.
Back flushing means you will reverse the flow in the core, and hopefully push any larger debris out the way it came in.
Regular flushing doesn't do this.
Google: back flushing heater core video
The make and model don't matter, method is the same on all vehicles, you can use air or, what I use, a garden hose, after first back flush I also fill core with a warm mixture of CLR and let it sit for 20 min. then back flush it a few more times.
I then fill it with coolant before reattaching the hoses."
I hope this helps you!
Changed the thermostat and flushed the radiator and still no heat, what do I do?
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