Question about 2002 Chevrolet Impala

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My temperatur gauge shows hot when i turn on the ignition and two fans turns on right away can you tell me whats the prablem is?

Can it be water pump

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Well it can be one of too things the gage or the temp sensor.
its most likely the sensor. The temp sensor is normally mounted with the thermostat housing which is on the top of the engine and has the top radiator hose going to it if you can't see it, try taking off the plastic covers. With the ignition on so all gages are reading go and unplug the sensor the gage should drop back strata way, this tells you that you have the wright sensor there are sometimes 2 one for the gage and the other for cold starting. There is a possibility that the problem may be coursed by a squashed or rubbed throw wire so if you can't make the gage return to cold by disconnecting the wires then start following the wires back along the engine.
I think you will find a faulty sensor is the cores of your problems and should be easy to pick up at any car part place.

Posted on May 09, 2014

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  • 17 Answers

Temp sensor fault ....cause it can't tell the temp of the engine ..so it goes into safe mode and puts the fans on

Posted on May 09, 2014

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  • 66 Answers

No, not the coolant pump. Possible fan relay stuck on or the ECU is detecting a hot engine due to the temperature sender telling the ECU the engine needs cooling. Sender seems at fault.

Posted on May 09, 2014

  • Jim Cameron May 13, 2014

    I would say it's the (Sending Unit) on the motor.

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Posted on Jan 02, 2017

  • 740 Answers

SOURCE: Overheating

Make sure you don't have a bad head-gasket. Check for excessive pressure in radiator or hoses. Check under oil cap for creamy/milk like residue or actual antifreeze in oil or the opposite oil in antifreeze. Let me know what you find. Good Luck

Posted on Dec 12, 2008

  • 79 Answers

SOURCE: 2005 chevy equinox temp gauge showing hot fan

check the coolant temp sensor

Posted on Mar 22, 2009

jagjeffery
  • 316 Answers

SOURCE: 1999 Chevy Cavalier Z24 2.4L cooling fan inoperative

yes you could have a bad ECT or the relay could be bad it sounds more like the relay is heating up and kicking out

Posted on May 30, 2009

  • 34 Answers

SOURCE: engine does not appear to be hot. Gauge says extreme heat

try replacing your temperature sending switch. That it what tells your gauge or idiot light where to read or light to come on. It may have a short in it. Or a short between the two.

Posted on Oct 08, 2009

miket756
  • 2702 Answers

SOURCE: Radiator problems

it may be a little off, but the lower water hose seldom gets very hot,, as its this hose that suplyes the engine with ""cold water"" the hot water comes out the top hose,, drains down the rad and cools on the way down then enters the engine through the bottom hose """if your engine stayes running in the normal place on the gage,,,and not over heating""" why are you spending money for nothing???""
you wont get the bottom hose to run hot unless the engine is cooking

Posted on Oct 30, 2009

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1 Answer

Temperature gauge quit where is the sensor and how do I check if its the sensor or the gauge?


you have to be specific in the tear ,make,model of the vehicle
some engines use a temp sender unit as well as a temp sensor unit
check around the outlet area of the head and if you find a small sender with one wire to it then remove the wire and place it on the head
turn on the ignition and if the gauge immedately goes to hot , turn of the ignition switch and replace that sender
some late model engines use a sensor for two purposes
1 to tell the ecm when to turn on the fans and
2 to have the ecm show the coolant temp on the gauge
if in doubt have an accredited auto electrician check it for you

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I just replaced thermostat and veh still running hot?Why?


hello tbrink. most likely your water pump is not running like it should resulting in it running hot. To test it do this: Get your car up to operating temperature, run the A/C. Once the temp is about 80-85 deg. Park it and let it sit idling with the A/c on for about 5 minutes, then turn the car off. let the car sit for about 5 minutes with the engine off. Then turn the ignition so that the temp gauge registers. You will probably see it spike to over 100 because the car has been sitting with a hot engine and no coolant flowing through to take away the heat. Note the temp, then start the engine. If the temp doesn't come down to normal within about a minute, then you probably have a bad pump. When functioning properly, as soon as the car is cranked the pump will move enough coolant through the head to drop the temp very quickly.

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1 Answer

How can you tell if the water pump is bad?


Hello jcs... Usually the water pump squeals loudly and there is water on the ground under the car. For the definitive test, get the car up to operating temperature, run the A/C. Once the temp is about 80-85 deg. Park it and let it sit idling with the A/C on for about 5 minutes, then turn the car off. Let the car sit for about 5 minutes with the engine off. Then turn the ignition so that the temp gauge registers. You will probably see it spike to over 100 because the car has been sitting with a hot engine and no coolant flowing through to take away the heat. Note the temp, then start the engine. If the temp doesn't come down to normal within about a minute, then you probably have a bad pump. When functioning properly, as soon as the car is cranked the pump will move enough coolant through the head to drop the temp very quickly.

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1 Answer

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