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09-29-2015, 07:00 PM | #1 |
Drives: 2007 Toyota Yaris Join Date: Sep 2015
Location: NC
Posts: 3
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Overheating issue
A few weeks ago my 2007 Yaris started to overheat. Based on the issues I was having I changed the thermostat and water pump. I am still having the issue. The heater will not blow hot air and the car will still over heat. I can't find any leaks. I may also have air in the system. I have tried to allowing the car to run and adding coolant when the fan kicks on. Could air pockets be the cause? Any help is greatly appreciated.
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09-29-2015, 07:08 PM | #2 |
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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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Air pockets could definitely be part of it, particularly with the heater core not working. There is a petcock on the back of the engine that must be opened when refilling the system otherwise a large pocket of air is trapped.
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09-29-2015, 07:10 PM | #3 |
Drives: 2007 Toyota Yaris Join Date: Sep 2015
Location: NC
Posts: 3
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Should I drain it. Open the petcock on the back and refill it. Or should I just open it now and try it?
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09-29-2015, 07:32 PM | #4 | |
Quote:
Sent from my Moto X Play |
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09-29-2015, 07:49 PM | #5 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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Quote:
If you fill the system without opening the petcock, no matter how much you run it with the cap open you will not get all of the air out.
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09-29-2015, 07:59 PM | #6 |
Drives: 2007 Toyota Yaris Join Date: Sep 2015
Location: NC
Posts: 3
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Do you have a link to a video or diagram of the petcock?
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09-29-2015, 08:56 PM | #7 |
Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
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^ya Scott, I'm curious as to what you find is the easiest method to access the petcock and what tool you use to open and close it.
To the OP, check the temp of your upper and lower rad hoses, could be a blockage of some sort not allowing heater core to heat up and/or not allowing fluid to fully circulate hence the over heat
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09-29-2015, 09:04 PM | #8 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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Here is a view of it from under the car. Once you understand where it is, you can easily access it from above. A 10mm socket is necessary to open it.
Yaris - Coolant Petcock.jpg
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09-29-2015, 09:29 PM | #9 |
Drives: 3-door hatch Join Date: Oct 2010
Location: Los Angeles
Posts: 519
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Is this petcock unique about this engine or do most modern engines have these now? I don't ever remember hearing/reading about such a petcock on older cars. And why wouldn't they put it on the head, at the highest point of the engine?
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09-29-2015, 10:33 PM | #10 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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I personally have only run into them on the 1NZ. I assume it is due to an issue where the path of water flow has a spot where air can collect and not be easily purged.
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09-30-2015, 07:35 AM | #11 |
Drives: 2010 yaris 3 door hatch Join Date: Jun 2013
Location: Sheboygan Falls, Wi.
Posts: 506
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You could also purge air at the heater hoses, remember air rises. I like to use a heater hose pick.
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