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04-01-2014, 09:38 PM | #19 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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If it starts at the "cold" level in the reserve tank and then overflows it when the engine is hot, then you still have air in the system. Air expands far more than coolant does, so the air bubble pushes the coolant out.
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04-02-2014, 01:58 AM | #20 | |
Drives: 08 White Yaris Join Date: Jun 2012
Location: United States
Posts: 20
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04-02-2014, 06:21 AM | #21 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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The fan kicks on about the same time that the thermostat opens, so at that time the coolant start fully circulating beyond the engine.
If the heater core is leaking the coolant will go into the bottom of the airbox, where it will drain from the condensate drain tube (which is mounted to the bottom of the firewall on the passenger side). Park the car over a dry spot and try it again, noting where under the car it seems to be leaking from.
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04-02-2014, 07:24 AM | #22 |
Drives: 2010 yaris 3 door hatch Join Date: Jun 2013
Location: Sheboygan Falls, Wi.
Posts: 521
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It might have an internal head gasket leak, this is when combustion chamber gases get into the cooling system. Any air that's in the cooling system expands a lot when heated. They have testing tools to determine that.
On cars that I work on that seem to have air in the cooling system, I unhook one of the heater hoses & fill it up. A funnel on the radiator might help too. To be honest my mechanical experience with the yaris is limited, it been the most reliable car I've owned. |
04-17-2014, 07:33 PM | #23 |
Drives: 08 White Yaris Join Date: Jun 2012
Location: United States
Posts: 20
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Well it was tons of air bubbles caused by a problem with the head gasket. It's all fixed up. Thank you guys for all your help
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04-18-2014, 12:00 AM | #24 |
Drives: 2008 Liftback Join Date: Nov 2010
Location: Murfreesboro, TN
Posts: 56
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So, with 240,000 miles you had to replace the head gasket?
Was that due to it overheating? And then, if the answer is yes, did it overheat because of a faulty thermostat? Just trying to establish what I might need to keep an eye on as mileage on our little guy climbs. Thank you for your input.
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04-18-2014, 02:09 AM | #25 | |
Drives: 08 White Yaris Join Date: Jun 2012
Location: United States
Posts: 20
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