Question about 2001 Kia Sportage

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Electric fan runs with A/C on. Does not come on with overheating

Does Engine temperature sensor control electric cooling fan?

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The A/C fan is separate from the engine cooling fan, yes the engine cooling fan has a thermal switch that will only turn the fan on when needed.

To test that switch you can let your vehicle idle for about 5 minutes until the temperature gets to about half way and the fan should come on, don't allow the vehicle to get into the red mark.

If it is not turning on then you need to have it looked at, check your fuses and so forth.

Posted on Sep 05, 2009

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The mechanic should always know that the sensor is the one that sense or detect the problem of the car . The sensor is the one that tells if there is a problem in the electric unit of the car . The sensor is not the one controlling the electric cooling fan ,but it is the one that give warning that there is problem in that part of the car.

Posted on Sep 05, 2009

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1 Answer

How do I solve overheating?


First, find the problem.
When the engine is running, whenever it reaches the temperature of the thermostat, that thermostat is supposed to open, allowing the hot coolant to flow to the radiator, to maintain proper engine temperature.
The thermostat could be stuck closed, needing replacement.
Whenever the engine gets warm, there is also an electric fan in front of the radiator, to cool the hot coolant in the radiator.
This fan works off a sensor that is ******* into the engine block (whose function is to read the engine temperature) and sends an electric signal to the electric fan to start when needed.
The sensor could be bad, the fan motor could be bad, and there is a relay in the system that could be bad also.
God bless your efforts.

Sep 10, 2015 | 2009 Saturn Vue V6

3 Answers

Why does my fan always run intermittently? During traffic jams my fan will run about 25 times intermittently, and I check my temperature it is still normal?


sounds like problem with the temperature sensor or relay that controls the fan(if electric) check the sensor and relay one may need to be replaced.

Mar 24, 2015 | Cars & Trucks

1 Answer

Electric cooling fans not working at any time while vehicle is running causing temp gauge to read high.while vehicle is moving temp gauge will go to normal.as soon as you stop temp gauge begins to...


{: ) You didn't mention the model of your vehicle. Anyway, I admire your way of observation, and I'm sure you got the analogy by now. When the car is running, the engine rpm is higher, and so with the water pump, plus the wind velocity passing thru the radiator fins, can give sufficient engine cooling without the electric cooling fans. But when your vehicle stops, like sitting on a traffic, the engine rpm is lower, and so with the water pump, and there ain't enough wind to help.
This is why the electric cooling fans are very important in maintaining engine temperature at normal levels in any driving conditions.
Basically, the cooling fans are controlled by the engine control module (ECM). The ECM monitors input from various engine sensors and then will give an output signal based on its programmed instructions. The output signals will energize the corresponding fan relays, be it high or low speed.
You can start by checking first the easy ones like the fuses and relays. Cooling fans usually have square top transparent windows. Check the the underhood fuseblock label to locate. Might as well check all fuses to be sure.
Check the cooling fan relays for signs of overheating, and also for loose terminal seating.
Check the cooling fan if stuck, and also check the connectors if burned or melted. To rule out a defective cooling fan motor, you can check for continuity, or you may apply direct voltage to the two wires on each fan.
The mostv frequent cause of cooling fan malfunction is on the fuses, relays, and connectors.

Jul 22, 2011 | Chevrolet SSR Cars & Trucks

1 Answer

Hello, I have a 1995 mercury sable and just replaced the upper radiator hose last weekend and for the past week, I have been dealing with overheating, I have added 50/50 coolant and the temperature...


First replace your Thermostat, and then have your Electric cooling fan checked.

Try getting a scan at Autozone, Advance, or Oreillys autoparts. They will do it for free. Or if you just want to buy a few parts, observe if the cooling fan even comes on. There are 2 temperature sensors on most Ford's and one makes the dash gauge work and the other makes the Electric cooling fan work. Just have the car a little warm and when you get the dash gauge to move, disconnect the temp sensors one at a time until you find the one that controls the gauge. The remaining sensor controls the cooling fan. Remember, the gauges only work when the engine is running.

If your cooling fan still does not work, ask the parts guys how many speeds your vehicle is suppose to have on its fan. Usually, when the A/C is turned on, high speed kicks in; for sure when you have overheating, it should be on high speed. The Electric cooling fan has a Relay that can be bad. The fan motor can also be bad.

The loss of Antifreeze in the system can be from boil over. As long as the car runs decent, there is no reason to expect a blown head gasket. With the Radiator cap off, you may be able to see bubbles on the surface of the radiator if a head gasket is allowing compression to get into the cooling system.

Just start with the easiest things like a Thermostat, then go to the next solution and work your way through the possibilities. I hope my comments are useful to you.

Jun 26, 2011 | 1995 Mercury Sable

1 Answer

Crownvictorias2006 overheating all the time


Do you think that it's overheating because the temperature light is on? If so, then it's possible that you have a bad temperature sensor and not an overheating engine.
Look for other signs of engine overheating :
1. Sluggish engine operation.
2. Detonation upon acceleration (pinging).
3. Rough, uneven engine idle.
4. Coolant boiling in overflow tank.
If your vehicle is experiencing these symptoms, then overheating is indicated. One of the most common cases of overheating is a bad thermostat. Another common problem is a faulty cooling fan or fan circuit. The cooling fan can be checked by running the engine at operating temperature and turning on the AC control. if the fan does not come on, then a problem with the fan circuit is indicated. The thermostat can be checked by placing a cooking thermometer on the motor near the upper radiator hose where it attaches to the motor. the temperature should not go above 225deg. If it does, then replace the thermostat. If the temperature stays at or below this rating, then replace the temperature sensor. I hope that this information helps you with your problem and thank you for using Fixya.com.

WARNING : Be very careful when working around cooling systems when the engine is at operating temperature. DO NOT open the radiator cap (if equipped) or even the overflow tank cap when the system is hot. Always wear safety glasses. Remember that electric cooling fans can operate at any time, even after the engine is off. Keep hands away from fan when working in the engine compartment.

Jun 01, 2011 | 2006 Ford Crown Victoria

2 Answers

Car is overheating ...already replaced waterpump, flushed radiator, changed thermastat and replaced new water cap. there is no leak, and it over heats sometimes not everytime?


Hi!!
Make sure the small hose going from the reservoir to the radiator and the orifice at the reservoir are not clogged. If OK, check electric cooling fan system, specifically the Coolant Temp. sensor, Fan Relays and Constant Control Relay Module (CCRM).
Electric cooling fan system consists of a fan and electric motor attached to the fan shroud.
  • Engine temperature is monitored by the Engine Coolant Temperature (ECT) sensor.
  • Fan is controlled by Constant Control Relay Module (CCRM) with inputs from Powertrain Control Module (PCM).
The electric cooling fan is wired to operate only when ignition switch is in ON position and engine temperature exceeds specified temperature, or when A/C is on and vehicle speed is less than 45 MPH. During hard acceleration, the Wide Open Throttle A/C Cut-Off (WAC) relay controls the A/C clutch and cooling fan. A signal is sent to PCM and then to the CCRM, where the module de-energizes the A/C clutch and cooling fan, decreasing engine load during acceleration.
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

Feb 16, 2011 | 1996 Lincoln Continental

1 Answer

Hello... I got problem with my honda odyssey. For the past 3 days, if i start the engine, after 5 min the temperature will goes up to HOT and engine indicator light-up. I turn-off the engine and then start...


Your English is very good.

From what you have described, which is a rapid over heating of the radiator coolant fluid and therefore a hot engine condition, it would appear that the thermostat in the engine's cooling system is faulty.

If the thermostat is sticking in the closed or nearly closed position temporarily, there will be no flow or very little coolant flow between the engine and the radiator and the engine will overheat.

You have advised that after the engine is shut off , and radiator coolant fluid has cooled, you re-start the engine and drive the car without the overheating condition occurring again and the radiator coolant temperature is normal. This time there is no overheating because the thermostat is working normally.

You should have the thermostat replaced as soon as possible because allowing the engine to overheat can cause very expensive engine damage.

If you had a continuing overheating condition then I would suspect both the thermostat and the water pump. However as the overheating seems to be only temporary, and clears itself after you have shut down the engine and re-started it 10 minutes later (without further overheating arising) then I think you only have a faulty thermostat.

Please also check that the electric fans which draw air through the radiator are operating. These run on a temperature sensor and will switch on automatically once the radiator coolant fluid reaches a certain temperature and then switch off again when the fluid temperature reduces. You will hear them running once they start up. If these fans are not working the radiator coolant can quickly overheat in various driving and temperature conditions because there will be insufficient air flow through the radiator to cool the fluid. If the temperature sensor is faulty or has died, or if the electric motors running the fans are faulty, the fans will not operate.

I hope this helps.

Dec 18, 2010 | Honda Odyssey Cars & Trucks

1 Answer

Engine is overheating. The cooling fan isnt running. I checked the fuses and relay, All is ok. Is there and where is the cooling fan thermo switch located? Thanks Ken


there is "coolant temperature sensor" its located on the drivers side of the engine on the back towards the firewall. Have you checked your cooling fans? I have replaced a lot of these for the electric motors going bad. Good luck hope this helps.

Aug 30, 2010 | 2004 Pontiac Sunfire

1 Answer

97 jeep cherokee electric fan problem


sound like coolant temperature sensor is open or not working.scan it to see when engine get operating temperature when coolant temperature get 190 degrees the coolant temp sensor should show 190 degrees if it shows 80 degrees or lower it not working replace it.the coolant sensor control coolant fan.when it gets hot it resistance changes or lower.the pcm grounds it .then cooling fans will run.

Jun 17, 2009 | 1989 Jeep Cherokee

3 Answers

Van chevrolet venture 2000


Fifteen minutes! you have bigger problems than only the fans the fans are controlled by a thermo switch that is heated by the coolant, If you have no coolant the sensor cannot activate But fifteen minutes seems like you may have a headgasket problem and steam cannot heat the coolant sensor.OperationNotesThe electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is controlled by the Powertrain Control Module (PCM) . The PCM turns the cooling fan ON by grounding the coil of the cooling fan relays when certain conditions are met. When the A/C is requested, the cooling fan will also be turned ON.

Power for the cooling fan motors are supplied through Maxifuses(R). The cooling fan relays are energized when current flows from the fuses in the Underhood Accessory Wiring Junction Block, and through the relay coils to ground through the PCM. The Coolant Fan 1 Relay Control Circuit is grounded for low speed fans operation. During low speed fans operation, both fans run at a slow speed. The Coolant Fan 1 Relay Control Circuit is grounded for high speed operation. During high speed fans operation, both fans run at high speed.

IMPORTANT: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. Perform the A Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans.

For more information regarding the Charging System, refer to Charging System Description , and Charging System Circuit Description in Starting and Charging.

If a problem that involves the low speed cooling fan relay control circuit exists, DTC P0480 Cooling Fan Relay 1 Control Circuit should set. If the problem affects the high speed cooling fan relay control circuit, DTC P0481 Cooling Fan Relay 2 Control Circuit should set. A problem with the ECT sensor should set DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage, DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage, DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage, DTC P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Electric Cooling Fan Diagnosis.

For more information regarding the Cooling System refer to Engine Cooling Fan Description - Electric, and Cooling System Description in Cooling System.


Here is the electrical schematic and how it all is suppose to work,
If you need any further help please contact me Thank you,Randy If you find this information helpful please give me a good rating

www.aceautomotive1.com

Aug 16, 2008 | 2000 Chevrolet Venture

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