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#1 |
![]() ![]() ![]() ![]() Drives: 2008 Black Sedan Join Date: Oct 2008
Location: FL
Posts: 966
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I have had this problem for about 8 months now. My cool engine light stays on no matter how long I drive. No CEL or anything related to it. My Scan gauge shows that the max temp it gets while cruising is 118F. If I am stuck in bad traffic and its a standstill, then it will rise to about 140F and the light goes off. When I get some speed it returns to 118F and cool light comes back on.
So my question is what would cause an engine to stay running cool even after an hour of highway driving? Things I will be replacing are the Coolant temp sensor and the thermostat. That's all i can think of. |
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#2 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Most likely it is just that the coolant temp sensor is bad.
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#3 |
![]() ![]() ![]() ![]() ![]() ![]() Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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wouldn't that mess up the carburation?
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Synthetic Oil: Its All In Your Head |
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#4 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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It would make the car run a bit rich, but if you keep driving with it that way the fuel trims will adjust it out.
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#5 |
![]() ![]() ![]() ![]() Drives: 2008 Black Sedan Join Date: Oct 2008
Location: FL
Posts: 966
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I am think so too CT. Easy to replace I will start there first. Maybe that's why its running so rough when its cold out.
Last edited by Yoda; 03-14-2014 at 10:24 AM. |
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#6 |
![]() ![]() ![]() ![]() ![]() ![]() Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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a yup.
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Synthetic Oil: Its All In Your Head |
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#7 |
![]() ![]() ![]() Drives: 2007 red Yaris HB AT Join Date: Dec 2013
Location: southeast USA
Posts: 197
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Could it be thermostat stuck open? Is heater working OK or too cold?
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#8 |
![]() ![]() ![]() ![]() Drives: 2008 Black Sedan Join Date: Oct 2008
Location: FL
Posts: 966
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Heater is working fine but sometimes when the AC is on cold, it fluctuates between warm and cold.
Getting the temp sensor today to see if that works. |
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#9 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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I'm voting bad thermostate.
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#10 |
![]() ![]() Drives: 2007 Yaris Join Date: Jan 2012
Location: Laval, Canada
Posts: 74
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It's pretty dabgerous because if the fan ever needs to start and it doesnt you can damage your engine
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#11 |
![]() ![]() ![]() ![]() Drives: 2008 Black Sedan Join Date: Oct 2008
Location: FL
Posts: 966
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Have not had the time yet to do it. I will try for this weekend and let you guys know.
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