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post #1 of 12 Old 11-21-2014, 08:05 PM Thread Starter
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temperture is near cool while driving on freeway

while idling temp rises to normal operating temp. but gauge drops to near cool while driven...any suggestions please comment for tips on diagnoses or had similar problem and now fixed explain below...
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post #2 of 12 Old 11-21-2014, 08:43 PM
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I would suspect the t-stat. Sitting still there may be less cold air going thru the radiator. Driving down the road may create more cooling than the fan(s) running while idling. May not be the problem but I'd consider it a likely possibility. But check coolant level too.
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post #3 of 12 Old 11-21-2014, 08:56 PM Thread Starter
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what's t-stat? also the coolant level from reservoir goes downs every other day...replaced radiator cap thinking the coolant temp sensor since when starting the idle is rough then dies...

Last edited by ToyotaRav4; 11-21-2014 at 08:58 PM.
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post #4 of 12 Old 11-21-2014, 09:25 PM Thread Starter
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thats what i suspected too...if the thermostat is faulty it may stay open in turn letting coolant flow causing cooler temp..
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post #5 of 12 Old 11-21-2014, 09:30 PM
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Quote:
Originally Posted by ToyotaRav4 View Post
what's t-stat? also the coolant level from reservoir goes downs every other day...replaced radiator cap thinking the coolant temp sensor since when starting the idle is rough then dies...
It means thermostat. A defective thermostat is a likely cause but is difficult to know for sure unless it is replaced or taken out and tested. Changing this is inexpensive and could remedy the problem.

Last edited by dl175; 11-21-2014 at 09:43 PM.
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post #6 of 12 Old 11-21-2014, 10:42 PM
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Sorry, t-stat is short for thermostat. Also, I'm pretty sure I've read low coolant level can be a problem. I suspect at idle with low coolant, it doesn't circulate as well as it should but at higher RPM the water pump probably increases the circulation and cooling effect.
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post #7 of 12 Old 12-01-2014, 09:39 PM
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Has the car ever run hot? Having to replace that much coolant every other day and it running rough sounds like a blown head gasket and the thermostat is probably stuck open as well but, coolant dropping and idling rough and dying isn't a thermostat problem
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post #8 of 12 Old 12-03-2014, 12:53 AM
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Originally Posted by tpence2177 View Post
Has the car ever run hot? Having to replace that much coolant every other day and it running rough sounds like a blown head gasket and the thermostat is probably stuck open as well but, coolant dropping and idling rough and dying isn't a thermostat problem
Very true, but that information wasn't imparted in the original post. That's one of the challenges of attempting to troubleshoot problems on the 'net. Still, a lot of the information found here is worth much more than we pay for it.
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post #9 of 12 Old 12-03-2014, 01:02 AM
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Sounds more like low coolant to me. I have had bad thermostats, stuck open, and at idle they weren't even trying to get up to temperature. Dead of summer even took nearly an hour of driving to get things up to temperature.

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post #10 of 12 Old 12-06-2014, 05:04 PM
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Sounds more like low coolant to me. I have had bad thermostats, stuck open, and at idle they weren't even trying to get up to temperature. Dead of summer even took nearly an hour of driving to get things up to temperature.

It has to be going somewhere though if the op is replacing it that often though.
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post #11 of 12 Old 12-06-2014, 05:10 PM
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Sounds like you have two problems.
A bad thermostat that's staying open
A coolant leak

You need to find and fix the coolant leak and while the system is drained of coolant replace the thermostat. Look up how to circulate the cooling system and bleed the air otherwise you will overheat the engine.
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post #12 of 12 Old 12-06-2014, 05:55 PM
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Could already be overheating, with lack of coolant I don't think that the temp sensors read correctly
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