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07-16-2019, 12:02 PM | #1 | |
Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
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Quote:
And that is also why I said you can just simply drain and re fill as you likely will not have any benefit of a flush. If you are set on flushing it, then just run water through it until it comes out clear. Then start adding the coolant that you premixed in other jugs until the rad is full. Over fill the overflow reservoir a bit as well. Squeeze the rad hoses a bit and you will see the coolant level drop a bit in the radiator. I typically jam a funnel in the radiator fill hole and over fill the funnel and then turn the car on, you will see the level drop a bit and then start to rise as it warms up. Once the car is off it cools and starts dropping. Go back after 30 mins and remove the funnel and top up the rad. Drive your car will an over filled overflow reservoir and check it every day as it will drop as air ir burped out of the system. This will stop after a couple days. In my experience with various Yaris', they bleed air from the cooling system really well, just make sure the front end is jacked up so the rad cap is the highest point of the engine. Once this is done you need to buy a tester to make sure the freezing point is well below anything that you will see in your climate. You will have more than enough coolant in there for the summer, but potentially not enough for the winter, depending on your climate. Most of the coolant is removed when you drain the rad, but a slight amount will still be left in there. FWIW many people say you need the fan to turn on to open the thermostat - this is wrong and a waste of time. The T-stat opens at 180F, well before the fan kicks on (typically 204F). Also the Tstat is not an all or nothing mechanism, it will slowly open just prior to 180F and fully open around 180F. I have successfully bled cooling systems in ambient temps way to cold to get the fans to turn on. I just finished draining and re filling my Subie Outback and when the fans actually kicked on the coolant level didn't even drop - this is because the Tstat was already wide open well before the fans kick on.
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No one ever wants to give a Yaris the point by... |
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07-16-2019, 11:16 PM | #2 | |
Drives: 2008 Yaris Base Hatchback Join Date: Nov 2010
Location: Pacific NW
Posts: 248
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Quote:
I am still kind of undecided whether to just simply drain and re fill or to flush. A flush will mean extra time and effort. How much extra time and effort is involved in the flush? I talked to one mechanic at a Toyota dealership and he said they do not do a flush unless it has been a very long time since the coolant was changed, the change is long overdue and there is evidence the coolant has begun to degrade: e.g., coolant no longer "clear," but has particulate matter present in the coolant, etc. It seems, however, that there would be some degradation of the old coolant that remains after drainage (because some old coolant remains in the system after drainage), even if you cannot see the degradation (e.g., particulate matter, etc). QUESTION(S): Does anybody have any objective evidence a flush will be of benefit or no benefit? Does anybody have a lot of experience with this question? Thanks, R. Last edited by RMcG; 07-16-2019 at 11:32 PM. Reason: add info, corrections |
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Tags |
change, coolant, engine |
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