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#4704782 - 03/23/18 11:32 PM 2007 Corolla; low idle and overheat condition
Rolla07 Offline


Registered: 11/05/11
Posts: 4755
Loc: MTL, CANADA
Hey all, my car had some issues today..so wife was in car (car idling) while i was in store and she tells me she shut off car because it was idling funny. (Low idle) almost like it was going to stall. I restarted and sure enough low idle like it was going to stall out. After a few minutes it seemed normal so I drove off again. At drive thru to get my kid food and I noticed temp gauge was higher than normal. Checked under hood and only thing I noticed was coolant overflow was higher than usual...usually its halfway between low and full and it was showing just about at full line. No apparent leaks or anything and no codes thrown (no check engine light) as didnt have my scanner to check for codes. Had it towed to mechanics. Tried to read up a bit wondering what it could be (was thinking head gasket) so checked oil and it looked fine on dipstick, not muddy or abnormal. From what Ive researched Im thinking coolant temp sensor maybe but im not certain. Just curious if anyone has experienced this or if anyone has any ideas on what it could be. Mechanic is only in on Monday so im just curious what it might be. 155k miles. 1zzfe engine. Thoughts appreciated smile
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4704793 - 03/23/18 11:51 PM Re: 2007 Corolla; low idle and overheat condition [Re: Rolla07]
Nick1994 Online   content


Registered: 02/19/13
Posts: 10311
Loc: Phoenix, AZ
When was the coolant/water pump/thermostat/radiator cap last replaced?
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2015 Hyundai Sonata 2.4L 81k Mobil 1 AFE 0w30 & OEM
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#4704807 - 03/24/18 12:04 AM Re: 2007 Corolla; low idle and overheat condition [Re: Nick1994]
Rolla07 Offline


Registered: 11/05/11
Posts: 4755
Loc: MTL, CANADA
Originally Posted By: Nick1994
When was the coolant/water pump/thermostat/radiator cap last replaced?


To be honest, i am running a bit late on doing a coolant flush. Was last done in 2012...water pump - never replaced (never showed signs of a leak)- to this day still no leak. Thermostat- still original, rad cap- still original. Would one of these impact the idle also?
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4704822 - 03/24/18 12:47 AM Re: 2007 Corolla; low idle and overheat condition [Re: Rolla07]
KrisZ Offline


Registered: 12/23/06
Posts: 7508
Loc: Toronto, Canada
If it's a failing water pump, like a deteriorated impeller, reving the engine above idle for few minutes should bring the temp. down.
How is heat when that happens? Any fluctuations in the vent temp?
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#4704824 - 03/24/18 12:52 AM Re: 2007 Corolla; low idle and overheat condition [Re: KrisZ]
Rolla07 Offline


Registered: 11/05/11
Posts: 4755
Loc: MTL, CANADA
Originally Posted By: KrisZ
If it's a failing water pump, like a deteriorated impeller, reving the engine above idle for few minutes should bring the temp. down.
How is heat when that happens? Any fluctuations in the vent temp?


To be honest i drove it for literally 1 minute to the drive thru..idling was normal at drive thru (strangely) but temp was going up quickly. No signs of overheating when car displayed low idle issues earlier.
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4704840 - 03/24/18 01:55 AM Re: 2007 Corolla; low idle and overheat condition [Re: Rolla07]
Nick1994 Online   content


Registered: 02/19/13
Posts: 10311
Loc: Phoenix, AZ
A water pump that has lost its fins to corrosion won't pump much water. A lazy thermostat can open late and make it run warmer. And a bad radiator cap won't hold pressure and can make it overheat.

Overheating can make the idle weird.

Sounds to me the entire cooling system needs a refresh just to start with.
_________________________
2015 Hyundai Sonata 2.4L 81k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 229k Valvoline & Fram Ultra
1996 Jeep Cherokee 4.0L 146k Mobil 1 HM 10w40 & Fram Ultra

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#4704895 - 03/24/18 06:28 AM Re: 2007 Corolla; low idle and overheat condition [Re: Rolla07]
Trav Offline


Registered: 11/20/06
Posts: 19346
Loc: MA, Mittelfranken.de
Are the electric fans coming on?
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#4704898 - 03/24/18 06:36 AM Re: 2007 Corolla; low idle and overheat condition [Re: Trav]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2908
Loc: Wet side WA
Originally Posted By: Trav
Are the electric fans coming on?
thumbsup
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In: T6 5W-40 XG9100 74705 4-22-18

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#4704959 - 03/24/18 07:57 AM Re: 2007 Corolla; low idle and overheat condition [Re: Trav]
Rolla07 Offline


Registered: 11/05/11
Posts: 4755
Loc: MTL, CANADA
Originally Posted By: Trav
Are the electric fans coming on?


Not sure, but would that cause the low idle too?
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4704963 - 03/24/18 08:01 AM Re: 2007 Corolla; low idle and overheat condition [Re: Rolla07]
Trav Offline


Registered: 11/20/06
Posts: 19346
Loc: MA, Mittelfranken.de
Sure it would, an engine overheating will get tighter. Check the fans, I think you will find they are not coming on.
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#4704999 - 03/24/18 08:31 AM Re: 2007 Corolla; low idle and overheat condition [Re: Rolla07]
Char Baby Offline


Registered: 05/25/05
Posts: 10086
Loc: ROCHESTER, NY
All good advise!
It seem as though some maintenance is in order with a good flush through the heater core and possible a new T-Stat and/or water pump and even belt operation...and check the fan operation.
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#4705000 - 03/24/18 08:31 AM Re: 2007 Corolla; low idle and overheat condition [Re: Trav]
Rolla07 Offline


Registered: 11/05/11
Posts: 4755
Loc: MTL, CANADA
Originally Posted By: Trav
Sure it would, an engine overheating will get tighter. Check the fans, I think you will find they are not coming on.


Thank you sir smile
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4705013 - 03/24/18 08:45 AM Re: 2007 Corolla; low idle and overheat condition [Re: Rolla07]
SatinSilver Offline


Registered: 01/24/08
Posts: 10341
Loc: OH
Usually when the water goes bad on these engines it starts weeping coolant. I had mine replaced under warranty at the 60k mark. Just made it. I noticed the over flow tank was losing coolant, going from the full line to the min line in a few months.

Most recommend a simple drain and fill for the coolant on Toyotas fyi. A new radiator cap would be a cheap fix. Plus check the fans as mentioned. But would hold off on a new water pump for now. Next on list would be a new oem t-stat.


Edited by SatinSilver (03/24/18 08:46 AM)

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#4705072 - 03/24/18 09:50 AM Re: 2007 Corolla; low idle and overheat condition [Re: Rolla07]
JamesBond Offline


Registered: 12/13/06
Posts: 866
Loc: midwest
A bad battery or alternator cn cause running and gauge weirdness.

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#4705078 - 03/24/18 09:55 AM Re: 2007 Corolla; low idle and overheat condition [Re: JamesBond]
SatinSilver Offline


Registered: 01/24/08
Posts: 10341
Loc: OH
^ True, esp about the battery. Sometimes they even test ok but after replacement the issues disappear.

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