Question about 2003 Chevrolet Impala

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2003 IMPALA FAN DOES NOT WORK, CHANGED FAN MOTOR ,IS THERE A FAN SENSOR AND WHERE IS IT.

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Coolant temp sensor

Posted on Jul 21, 2009

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My impala overheating I did change the thermostat.still the same problem.what other issue could be.


Fan motor or the switch. Turn on the a/c with the engine running. The fan should come on, they normally stay on with th a/c on and that will tell you if the motor is ok. Thenif that is ok, drive it instill it gets hot and look and see if the fan comes on then, if it is not working when the engine is hot look at the temp sensor for the fan

May 17, 2012 | 2006 Chevrolet Impala

2 Answers

What is the normal operating temperature for a 2003 Chevrolet Impala with 3.4L engine? Mine use to be around 185 to 190 degrees on the gauge inside the vehicle. The gauge now can range from 200 to 220...


The range should be in the temp range of your thermostat within in a few degrees, you probably have a 190 degree thermostat. As the outside (ambient) temp rises it's normal for the engine to run a little hotter 200 degrees is safe with coolant, water boils at 212. Your fans should cycle, so it sounds like your temp sensor is faulty. if you haven't flushed your radiator and changed your thermostat lately, now would be a good time to do so. Hope this helps,

Jul 16, 2011 | 2003 Chevrolet Impala

1 Answer

2003 Chevy Impala, running hot. Changed fan shroud because cooling fan wouldn't turn on, switched out fan relays, no check engine light. Cooling fan still will not turn on.


Would turn the key on no need to start it and unplug the ect engine coolant temp sensor. If fans come on then suspect a faulty etc which may not turn on the engine light. Which engine is in the vehicle so I can help locate the ect which is usually by the thermostat housing.

Jun 12, 2011 | 2003 Chevrolet Impala

1 Answer

How do you change a blower motor on a 2003 chevy impala?


remove glove box for access remove power plug on fan , remove bolts ,some are hard to get to,fan assembly should twist out

Nov 16, 2010 | 2003 Chevrolet Impala

1 Answer

2003 impala 3.8 cooling fans not coming. repaled


Check the coolant temperature sensor, it may have dirty contacts which is an easy job to fix. Signal from the coolant sensor indicates to the ECM that the engine is at running temperature and for the ECM to reduce the amount of fuel from the injectors (always a rich mix when warming up). (A little while later the thermostat should open allowing hot coolant to flow via the top hose to the radiator) The ECM rthen triggers the (5 pin) relay and the fans then come on. Check also the coolant relay fuse.

Jul 22, 2010 | 2003 Chevrolet Impala

1 Answer

How to replace the radiator


I own a 2003 impala had the same problem if your car is over heating first check to make sure the sensor that controls the cooling fans is working if not you should have the sensor replace first. i also had my radiator replace as well but the sensor was the main reason for my car overheating.the sensor controls the fans which cools the radiator which will cause the temp gauge to be in normal range and your car will no longer over heat unless the thermostat needs to be replace.

Mar 15, 2010 | 2003 Chevrolet Impala

2 Answers

Electrical fans wont kick on, car will run hot if they dont kick in..Tried changing fuses still wont come on..


The fans have a seperate temperature sensor either in the radiator or the block. Follow the fan wires to locate this sensor and unplug the sensor and with the key on touch the wires together. If the sending unit is bad the fans will come on. If the sending unit works the fan motor is bad.

Jan 19, 2010 | 1995 Chevrolet Impala

3 Answers

Recently had a thermostat replace on my 2003 chevrolet impala


sounds like the fan motor is not coming on.open hood start engine and let it run until it has had time to fully warm up and see if the fan comes on if not then check fan relay and fan motor

Nov 10, 2009 | 2003 Chevrolet Impala

1 Answer

2003 impala overhearing change the termostate not loseing water


Replace the sensor that controls the cooling fans.I recently had that same problem my fans were not working properly due to a bad sensor had it replace and have not had problems with car over heating are running hot.

Jun 27, 2009 | 2003 Chevrolet Impala

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