Question about 2003 Chevrolet Impala

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How do i replace the knock sensor on a 2003 impala

It is leaking coolant

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: need to know location of coolant temp sensor in 2003 Impala

Need more info. I see from the location of your post that you have a 2002 Blazer. Do you mean a Trail Blazer? Chevy didn't make a Blazer in 2002. The ECT (engine coolant temperature sensor) is located on the driver's side, front of the engine. (on top) It is between the ECM (engine control module aka the engine computer) and the alternator. You will most likely need to remove the alternator and it's belt to obtain easy access to the sensor. If you need to remove the alternator for access, remember to disconnect the battery's negative terminal first. The sensor has a wiring harness with a connector mounted to the top of it. After you remove the electrical connector, the sensor will screw out using a deep socket and ratchet. You will loose some coolant (antifreeze) during the change, so make sure you have some DexCool antifreeze on hand.

Posted on Mar 04, 2009

  • 31 Answers

SOURCE: impala ls 2001 (coolant sensor)

the coolant sensor is screwed in so un screw it

Posted on Mar 08, 2009

  • 4 Answers

SOURCE: Have a 2003 Chevy Impala. Check engine light

Bank 1 is the rear O2 sensor, but experience says to change both. The front one is right behind the engine in the middle of the engine compartment. The rear O2 sensor is on the top of the exhaust pipe, just behind the catalytic converter. But the same code that shows it is the O2 sensor (which is P0420), is the same code for the catalytic converter, or a vacuum leak. Make sure if you do change the catalytic converter, ensure that the new one is OBD-2 compliant. And the vacuum leak could possibly come from the manifold gasket. Let me know what the problem was!

Posted on Mar 26, 2009

  • 521 Answers

SOURCE: Coolant Temperature Sensor location on 2006 impala

driver side of the engine block, forward and above the transmission. This piece threads into the engine block.

Posted on Jul 22, 2009

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SOURCE: Where and how many o2 sensor's on a 2003 chevy impala?

There are two sets of 02 sensors on most cars today. On set is set directly behind the header, one on each side, if it is a V engine. This set is used for the engine's ECU to control timing as well as other variables. The other set is placed on a bung in your Catalytic converter. This 02 sensor is used for emissions purposes only.

Posted on Jun 01, 2010

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Every time put gas in my 2003 Chevy impala goes on empty quick don't smell gas

give it a good tuneup. plugs, wires, airfilter etc. then go from there if there is no leaks. a bad coolant sensor will also cause it to use more fuel then before. do a tuneup first ! good-day ! tire pressure also.

Nov 01, 2011 | 2003 Chevrolet Impala

1 Answer

Where is the engine coolant temperature sensor or ECT on a 2003 3.4 leter chevy impala

Follow the upper radiator hose to the engine. Right where it goes to the engine (thermostat housing) there should be a brass screw-in sensor with 2 wires coming from it. Thats it.

Sep 01, 2011 | 2003 Chevrolet Impala

1 Answer

My impala was overheating. replaced water pump, thermostat, temp sensor, coolant sensor then found leak in radiator, bought new & replaced it as well. It acts like it wants to stall and temp guage goes...

Thanks for choosing FixYa and welcome. Do you have a check engine light on? If it was ran a lot during the overheating, there may be engine damage. You may have a bad head gasket.

May 10, 2011 | 2003 Chevrolet Impala

2 Answers

My 2003 chevy impala continues to over heat. I've had the water pump replaced as well as the therm, radiator, radiator cap and bled several times. I asked my mechanic if the head gasket was blown and he...

Thanks for choosing FixYa and welcome to the site. I see that you have changed a lot. Make sure you have no leaks. Make sure it is not leaking inside the engine. Inspect the vehicle engine while it is started to check for leaks. Since you have changed all the other parts, what about your coolant sensor? Also, if your check engine light is on, you should take it to Autozone to be scanned for codes. They do it for free.

Apr 20, 2011 | 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

2 Answers

2003 impala temp. gage goes high & low and no heat comes out of heater. it continues to cycle like this as I drive. When temp. gage goes up the heater quites.

Have u checked the coolant level? this type of problem useualy indicates the coolant is low, if it is low you need to have the engine cooling system tested for a leak, the coolant goes out somewhere.

Jan 29, 2010 | 2003 Chevrolet Impala

2 Answers

In my chevy impala i have no hot air comming out of the vents. The temperture gage reads at about half and then will fluctuate. What could be the problem?

Check your coolant level. When the level goes down, the heater is usually the first unit to show the lack of coolant (no heat). As the coolant decreases, eventually the temperature sensor is intermittently 'out of the water' and can't indicate water temperature, causing the fluctuation. If your coolant is low, find and repair the leak.

Jan 27, 2010 | 2003 Chevrolet Impala

1 Answer

Looking at change out the coolant sensor car is over heating but first it will blow cool air before it over heats when it finals blows hot air and the therostate opens up it goes back down we have changed...

It sounds like you have a head gasket leak or an intake manifold antifreese leak. Have a coolant system pressure test performed to determine where & the extent of the leak. The 2003 impala is noted for this problem. Good luck!

Nov 21, 2009 | 2003 Chevrolet Impala

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