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The coolant fans come on when i turn the key on and they are not hooked direct and the car runs bad

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  • Cadillac Master
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It sounds like you have a blown cylinder head gasket, have a local shop check this out for you.

Posted on Nov 01, 2012

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  • Cadillac Master
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Try changing your coolant temperature sensor. It may be bad or out of range. Can also cause hard starting and running poorly.

Posted on Nov 01, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 95 grand am radiator fan only runs with AC on

Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson

Posted on Feb 04, 2009

roniecon
  • 6826 Answers

SOURCE: i have changed the relays and fuses checked

replace coolant sensor connector?if so can u get a thermo lazer gun to check the block temp? this will tell u if the gauge is incorect,,,go ahead a bleed all the air out of cooling system and see if that does the trick

Posted on Jul 05, 2009

iambanshee74
  • 3489 Answers

SOURCE: engine will not crank, car just stopped running,

If there were no codes present upon initial inspection, check for fuel pressure and replace the pump if nothing or little is present. This is most likely with no codes. Also replace the filter. Let me know if you need instructions on pump replacement.

Posted on Oct 24, 2010

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1 Answer

Hi i have a 1989 toyota cam my cooling fans are not coming on any more i also had the thermostat change and the coolant drained and replaced what could it be please help. jeanette


Thanks for choosing FixYa and welcome. You need to check your fuses for the coolant fans. If the fuse is good, you either have a bad wire or a bad fan. You can always hook up a direct wire to the fan from the battery to get it to work. If it does, the wires are bad. Check for leaks and check the coolant cap. You could have a bad head gasket. A bad water pump can cause overheating, along with the valve and impeller. Check your radiator as well. Anyone of these parts can cause overheating. You could have a bad coolant sensor also. The most common is the thermostat and since you already changed that, next would be the water pump. But if the fans are not working, that is your problem. You probably have a bad wire somewhere. You can get a wire and splice it with the fan wire and run the wire to the battery or fuse box to see if the fans will come on. If they don't, you need a new one.

Jun 07, 2011 | 1989 Toyota Camry

1 Answer

The air conditioner fan and radiator fan does not start and the engine runs hottest than normal. Any relays or wiring problems ??? i did replace the thermal switch and coolant switch.


Thanks for choosing FixYa and welcome to the site. Have you checked your fuses yet? If the fuses doesn't work for the radiator fan, either the fan is bad or the wires are bad. You can hook a wire to the fan wires and run it to your fuse box to see if the fan is bad or it is the wire. It would at least turn the fan on to cool the engine. As for the a/c fan, same thing, check your fuses. You need a voltage meter. This way, you can test all your wires and you could pick out the bad ones, if the fuses turn out to be good. Once again, it could be the wires or the fan itself. I would say the fan is the reason you are overheating. Find the bad wire and replace it or run a second wire to the fuse box. Make sure you have correct coolant and check your hoses and clamps. It could be the coolant cap as well. If you have any questions, feel free to ask.

Apr 17, 2011 | 1991 Toyota Corolla

2 Answers

Fan works when hot wired but not hooked up right


I take it you mean the radiator fan. Check the thermostatic switch - bridge it out and see if the fan runs, if it does that is your problem.

Jan 29, 2011 | Ford Thunderbird Cars & Trucks

1 Answer

I had a problem with the fan it didnt turn on so my car over heated i changed the thermostat cuzit was broken then i hooked up the fan direct to my battery then i go to start my car and it cranks but wont...


IF CAR OVER HEAT IT WONT CRANK.CHECK COOLANT FAN FUSE AND RELAY.IF ALL IS GOOD YOU HAVE FAULTY COOLANT TEMPERATURE SENSOR.IF SENSOR OKAY HOTWIRE COOLANT FAN IF RUNS FAN GOOD IF NOT REPLACE FAN MOTOR AND CHECK COOLANT FAN WIRE CONNECTOR.

Oct 11, 2010 | Dodge Neon Cars & Trucks

1 Answer

I have changed the relays and fuses checked cooling fans which worked when direct power was appied hooked everything back together fans still will not turn on also cooling fan sensor was changed also temp...


replace coolant sensor connector?if so can u get a thermo lazer gun to check the block temp? this will tell u if the gauge is incorect,,,go ahead a bleed all the air out of cooling system and see if that does the trick

Jul 05, 2009 | 2001 Chevrolet Malibu

2 Answers

Running hot


most cars have two electric cooling fans ...one cools the engine and the other one turns on with the A/C to handle the additional heat lead.  Check the fuses and relays. 

Apr 03, 2009 | 1999 Dodge Durango

1 Answer

Electric fan will not turn off.


couple posabilities first run car up to temp then turn off...when fan stays running unplug the coolant temp sensor for the fan< there are 2 other is for comp/gauge> if fan turns off replace sensor if not replace relay for cooling fan

Mar 22, 2009 | 1997 Volkswagen Jetta

1 Answer

Engine Over heating while cooling fan not responding to cooldown!


Sounds like the temp switch for the fan or the fan motor itself. To check run jumper wires from your batter directly to fan.. If it turns on, then you have a bad switch. If not , your fan motor is bad. I do not have a diagram for your car but finding wires from your fan assemble should be easy. Trace starting from fan. There should be a harness soon after the fan for you to connect jumper wires to to check fan. And by the way it does not matter witch way you hook the jumper wires up. It will only change the direction the fan motor turns. Just make sure you disconnect the harness so that you do not create a back flow of current.The reason for your coolant overflow to be getting excessive pressure is the heat in the system is causing boil over(the car is too hot).

Nov 16, 2008 | 2006 Fiat 124

2 Answers

Radiator fan is not working


Some toyotas have a coolant sensor NOT to be confused with the Temperature sensor. The coolant sensor is located on the radiator it selt, most likely on the bottom and close to the middle. Replace it and the fans should work as needed. Now a temporary fix, unplug the sensor, this will make the fans run only when the engine is running or the key is on the on position. Good luck.

Jul 28, 2008 | Toyota Corolla Cars & Trucks

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