Question about 2002 Toyota 4Runner

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My car overheats only when stopped in traffic, but once I start moving it cools back down

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Are you running your A/C? Doesn't cost anything for these simple checks; with the vehicle parked in the drive, and the engine is cold; check to see if you can scrunch the radiator hoses all the way. The hoses should colaps to where both sides touch...unless you have dainty hands...but you should be able to get pretty close to both sides of the hose touching.

Next, start and run the engine for approximately 15 minutes, at idle, to let the vehicle come up to operating temperature. Once operating temp. is reached, you should see the electric fan cycle on and off.

Now that you have that established, turn on the A/C ON....the second fan should cycle on and off...if not, that is your problem - the fan that's not cycling is bad.

Another possibility, check the radiator hoses to see if they feel spongy...you should not be able to squeeze the hose fully at this time. If you can scrunch the hoses to where both sides touch...you have a pressure problem - which could be a bad radiator cap.

The next more expensive possibility could be a bad fan clutch...which would be the next likely replacement.

If this helps, kindly indicate so

Thanks so much, Mike...

Posted on Nov 20, 2009

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The cooling fan prabably isnt turning on. Next time turn the AC on when this happens. The AC should autmatically turn the fan on. If you dont see the temp going down then the fan isnt turning on.

Posted on Nov 20, 2009

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Park ur vechile open the hood with the a/c off check if the fan is rolling if it isn't check the fuse and inspect the wiring connections to the fan , if this doesnt work thenturn on the a/c if the fan doesnt come on wait for the engine to cool then check the coolant level if its ok please contact your mechanic

Posted on Nov 20, 2009

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This may be a trapped air bubble, check your coolant level, when the temperature is hot are the fans running, this may be a faulty heater sensor switch not engaging them. check your fan fuses and relays.
shoot down to the mechanics when it is hot, he shouldn't charge you just for looking. Good luck

Posted on Nov 20, 2009

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Overheating problem, what is the most probable cause?


You need to stop using it immediately before you
cause some damage or more than you may already have
That is just common sense. It should not overheat or
be any different than it was in the past without problem

The car has to be checked over/diagnosed,tested,etc for
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Borrow or Rent a car until resolved

No way to guess at the problem

You should have some type of codes avail even
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The timing belt maybe worn & jumped or the head gasket
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Over heating isn't usually a cheap repair unless the thermostat
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The RPM moves around the car is 11 years old,so it may just
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Timing Belt,O2 Sensors,Exhaust Converter,Spark Plugs
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If you depend on a repair shop to do things & don't
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