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Old 12-17-2016, 10:34 PM   #1
Yaris874
 
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Termostat won't open??? O7 YARIS H.B

So I randomly grab the bottom radiator hose after 30 minutes commute so was cold so I got a new termostat but is doin the same after goin to Gillette stadium is like 1 hour drive still won't open it got heat and won't overheat ?????

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Old 12-18-2016, 12:40 AM   #2
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how cold is it outside?
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Old 12-18-2016, 12:44 AM   #3
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Quote:
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how cold is it outside?
35°f

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Old 12-18-2016, 01:09 AM   #4
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So 1.6°C ... i assume you have proper amount of glycol in your cooling system .... and if not it still won't freeze on that temperature anyways :/
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Old 12-18-2016, 09:03 AM   #5
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Is the upper hose hot?

Coolant returns into the engine down there so it's possible it's been cooled down by the rad to the point of not feeling hot anymore.
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Old 12-18-2016, 10:19 AM   #6
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The top one should be the hot side. One these engines, when the t stat opens, it lets coolant into the engine.
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Old 12-18-2016, 11:05 AM   #7
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Thermostat heater cooling system temperature gauge.

The cabin heater is also a radiator cooling the system coolant. I would like a temperature gauge. My 1989 Tercel temp needle ran high for awhile. Then, I'm guessing, the thermostat or some blockage unstuck and it ran dead center again. Then the needle ran low and I stuck some cardboard behind the grille. And then got normal again. (Note: approach to non safety-critical items evolved as death-by-rust-inspection approached.)
But this dual-idiot-light-no-gauge approach of Yaris gives no such ability to track trends enough before extremes.

Last edited by dogsridewith; 12-18-2016 at 12:57 PM.
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Old 12-18-2016, 12:05 PM   #8
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What others have stated above. Check the top hose, it has cooled down enough by the time it reaches the bottom hose as well as through your heater core.

I find the 1nz cools very efficiently when outside temps are low
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Old 12-18-2016, 12:19 PM   #9
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And forget to mention ... malfunctioned radiator cap causes that kind of problems !
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Old 12-18-2016, 01:45 PM   #10
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If you have drained coolant recently, you may not have gotten all the air out of system?
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Old 12-18-2016, 01:53 PM   #11
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Quote:
Originally Posted by Bluevitz-rs View Post
Is the upper hose hot?

Coolant returns into the engine down there so it's possible it's been cooled down by the rad to the point of not feeling hot anymore.
The upper hose get hot and is pressure on the hose

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Old 12-18-2016, 01:57 PM   #12
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Quote:
Originally Posted by KimmoKekki View Post
And forget to mention ... malfunctioned radiator cap causes that kind of problems !
Ok I will change the cap thanks

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Old 12-18-2016, 01:58 PM   #13
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Quote:
Originally Posted by jra View Post
If you have drained coolant recently, you may not have gotten all the air out of system?
Yes I just did a water pump like two months ago

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Old 12-18-2016, 02:41 PM   #14
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Is overflow tank at correct level? Do you get illumination of the high temperature indicator lamp?
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Old 12-18-2016, 04:28 PM   #15
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Quote:
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Is overflow tank at correct level? Do you get illumination of the high temperature indicator lamp?
Yea but never gets hot

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Old 12-18-2016, 05:42 PM   #16
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You are saying you are not getting heat inside the cabin?

The heater core could be blocked....

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Old 12-18-2016, 05:49 PM   #17
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Quote:
Originally Posted by IllusionX View Post
You are saying you are not getting heat inside the cabin?

The heater core could be blocked....

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No i get heat

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Old 12-19-2016, 09:00 AM   #18
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lower radiator hose temperature coolant thermostat heat heater

We ALL now need to be curious and check the operating temperature of the fleet's lower radiator hoses...noting, at mimimum, ambient temperature.
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