Question about 2003 Chevrolet Impala

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2003 impala 3.8 cooling fans not coming. repaled

2003 impala 3.8 cooling fans not coming. replaced the 5 prong relay and they came on but are not working again? There are no trouble codes.

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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.

Posted on Jul 22, 2010

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1 Answer

Ck engine light problem on 2001 Impala


Well the code is for the circuit - the computer commands the relay to turn the fan on and it doesn't happen.
The computer provides the ground for the relay.
If you have replaced the relay and the fan and the fuse still blows, I would look for a problem in the harness between the fuse box and the fan, including the ground circuit for the fan.
The fuse for the cooling fan is usually a 30amp marked "cooling fan" in the fuse box in the engine compartment.
Do you know what the 25amp fuse that is blowing is for ?

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Chevy Impala 2003. Replaced cooling radiator cooling fan. Fan now works (driver side). Hooked up code reader. Received code for cooling fan removed code because fan was replaced. Next day engine light is...


is the passenger side coming on? it is possible that it is setting the code for different speeds also. may want to check the cooling fan relays.

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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.

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2003 chevy impala, 3.4L Radiator fans are not coming on, either by temperture or by turning on the A/C. I have checked the 3 relays and they are good. When I use a volt meter, I have 12 volts dc to the...


They are controlled by the ecm. Try unhooking the battery for 5 minutes. Then hook it back up. This will reset the computer. See if this makes it work. If it does the computer will need replaced. It will work for a while but it will go back to not working again.

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3 Answers

The cooling fans stop working


check your sensor that controls the cooling fans.may need to be replaced.

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Aux. Fan not comming on when hot or cold... Boils over. Blew out heater valve... REPLACED: New 3 Prong Fan Relay located by Rt. Sd. Batt. Radiator Relay ( its a 2 prong push in Radiator ). Checked for...


Replace your temperature sensor. There is a sensor specifically for the cooling fans that triggers the relays, and tells the fans to turn on/off. The relays won't energize unless it gets a signal from that sensor.

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2001 Impala Cooling Fan not coming on ever and car running hot. Temp sensor on manifold has been replaced with a brand new one.What to check next?


Locate and replace the fan relay, you can purchase a electrical component locator which is packaged on cd repair manual at ebay motors $20.00.

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1 Answer

Overheating after 5 miles of driving. Fan not running


If she paid someone to replace her radiator she should take it back. There are temperature relays around the fan I believe and the fans are not working. These are right in the area of the radiator. Someone must have disconnected the fan or the relays were failing before the radiator was working. Either way, the car is not cooling and she sought a solution to that problem. She was charged and the problem is worse. Go back to the radiator place.

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2003 impala is it a temp sensor or cooling fan switch


Maybe your radiator is clogged flush it out.

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1 Answer

PO481 code Chevy IMPALA 2003


Looked it up in Chilton's, confirmed in http://www.obd-codes.com/trouble_codes/

P0481 Cooling Fan 2 Control Circuit Malfunction

Each fan will throw a different code. See 3 fans listed for your model. Here's a link for the wiring schematic: http://www.chiltonlibrary.com/content/images/WD/GM/014/WD_GM_014788.pdf


Best of luck.
Greg

May 23, 2009 | 2003 Chevrolet Impala

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