Question about 2001 Chevrolet Impala

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The thermostat does not work and the fan stays on after the care is shut off. I have changed the sensore and the thermostat. The code readers indicates PO 118-temperature circuit high input, and PO 128-engine coolant temperature circuit malfunction .

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Jonah Oneal

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Posted on Mar 28, 2010


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My benz c240 has an error Coolant visit workshop and its fan work for few seconds and then stop

It could be a faulty thermostat or sensor on the radiator sensor on the radiator fan sensor, run diagnostic code reader to find out.

Jul 14, 2017 | Cars & Trucks

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Trouble codes p0118 temperature po118

code p0118 refers to engine coolant temperature (ETC) sensor ---circuit malfunction===causes---coolant thermostat---wiring open circuit/short to positive---wiring short to ground---ground wire defective---ECT sensor.. The temp gauge works off a temperature sender unit separate to the coolant sensor and if it is reading 100 then it indicates an overheat situation in the engine . Probably why the engine light is coming on. As the thermostat is in the list of causes I would replace it as a precaution. The coolant sensor is what tells the CPU to turn on the electric fans to cool the radiator

Jan 13, 2014 | 2004 GMC Envoy

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My 1993 lexus sc300 turbo keeps overheating but temp gauge on dash reads normal i have changed out thermostat,temp sensor , fanclutch no water in oil and no smoke coming from tail pipe also my check engine...

Do you have a way to read out the codes?
How do you know it's overheating? Blowing steam from the pressure release? Sluggishness? Water consumption ?
Does your fan work?
By the sounds of it it could be in limp mode, so yeah, an old reader would help here.

Sep 17, 2017 | Cars & Trucks

1 Answer

Engine light came on while driving on highway for 30 minutes

po128 cooling system preformance, this can be caused by a bad thermostat or fan relay, if the fans are staying on to long and last a bad coolant temp sensor, this car uses two coolant temp sensors, the best way would be with a scan tool to watch the sensor values and see if there are ok, this being a 2009 honda with 32,000 miles , this type of problem is not seen to often. check connections to sensors and make sure wiring is ok,

Jan 16, 2013 | Honda Accord Cars & Trucks

1 Answer

Cooling fan will not kick on when warmed up but if you unplug the sensor it will work

Change the sensor? have you tried to replace this unit.?
The cooling fan must click on as the thermostat reaches the set level. The thermostat must switch on the controller relay to switch on the fan which will stay on till the thermostat cut off .

Sep 01, 2010 | 2002 Ford Taurus

1 Answer

Fan blower stays on after i shut car off i unplug the wire for it so it does shut off and when i need air i plug it back it and my radio stays on after i shut car off and take key radio is...

Some cars are designed to have the fan run for a few minutes after you turn the car off. But if doesn't stop until the battery drains, then it might be a faulty switch or temperature sensor.

Or, if the fan stays running when the engine and radiator are cool you have a very cheap problem: The fan thermostat is stuck closed. A new thermostat will fix the problem--the hardest part of replacing it is finding it. Follow the wires from the fan to the switch--it is usually on the bottom tank of the radiator. Drain the radiator first and save the coolant to put back in after you replace the thermostat. NEVER OPEN A HOT RADIATOR.

If that wasn't it then check the following:
  • Check to see that your coolant level is correct. Top up as necessary.
  • Lay your hand on the radiator (with the engine off) and feel if it is as hot at the top as it is at the bottom. If not, your radiator may be clogged and need flushed or replaced. (Flushing is cheap. Replacing the radiator isn't)
  • Do you get heat from the heater? Leave it turned on high and see if your fan stays running the next time. If it takes care of the problem that could mean you have a kinked radiator hose.

Hope this helped (remember comment and rated this).

May 05, 2010 | 2005 Chevrolet Impala

5 Answers


I had this problem with a 2007 Chevy Cobalt. I changed the coolant sensor and even though the check engine light went out I still had a reading of "---" on the coolant gauge. The problem is most likely one of three things: a low coolant level, a bad coolant sensor, or the thermostat needs to be replaced. The only other possible thing it could be is a bad BCM (Body Control Module) which in that case you would most likely be having other weird problems.

The Thermostat and the sensor are both very easy to get to and replace. Take off the engine cover by removing the oil cap and they are both to the rear of the engine on the driver's side. They are right next to each other.

Hope this helps!

Apr 14, 2010 | 2007 Chevrolet Cobalt Coupe

1 Answer

Cooling fans

Yes, if the sensor didn't fix it, it is probably a relay problem. Chrysler has a habit (my truck especially) of using underrated relays that fuse in the closed position.
Power from the battery goes to the relay directly and that's the only place that the circuit would be opened to turn off the fans.

Apr 22, 2009 | 1998 Dodge Caravan

2 Answers

Audi A3 2001 radiator fan ruuning all of the time

yeah try to change the sensor.maybe it is busted. normally, most of the late-model cars comes with a fan feature that turns of after 5 or 10 mins even after switching off the engine. this helps to cool down first the engine to reach its desirable temperature before it is totally shut down. its good that your radiator fan has a feature like that. aftermarket perfomance fans do come with that feature because it takes care of the engine state.just try to change the sensor for engine temp

Feb 24, 2009 | 2004 Audi A4

1 Answer

Cooling fans

in the front bumper on driver side behind the front grill lttle rectangular piece with dimple on it that our problem fan relay check it out pierre

Sep 06, 2008 | 2000 Dodge Caravan

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