To test it properly, there are a few steps that should be taken to ensure all the components are checked. rehma6b0 457,823 views 26:00 How to fix an overheating Toyota Corolla. Home, Auto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Index Troubleshoot Electric Cooling Fan Copyright AA1Car An electric cooling fan that is not coming on when I had this problem on an older Chevy. http://clearduplicatefiles.com/radiator-fan/car-radiator-cooling-fan-not-working.html
Advertisement Autoplay When autoplay is enabled, a suggested video will automatically play next. ELECTRIC COOLING FAN CIRCUIT The fan's temperature-sensing power circuit only runs the fan when extra cooling is needed. If the fan runs, all of these components are okay, leaving one more to check.The final component to check is the temperature sensor. Typically when the engine computer loses the signal from the coolant temp sensor, it just turns both fans on high so the engine will not overheat. #4 LTC8K6, Mar 28, http://www.aa1car.com/library/electric_cooling_fan.htm
This should cause the fans to turn on low then kick to high, IIRC. A separate circuit turns on the fan when the A/C compressor clutch is engaged. Check also the functioning of the thermo-switch.
On applications that have variable fan speeds, the PCM generates an on-off duty signal for the fan motor ("pulse width modulation") that causes the fan to run faster or slower. Question: Which could it be: thermostat, coolant temperature sensor, or other? Bypass coolant temp sensor, relay and computer - Duration: 1:30. What Happens When Your Radiator Fan Stops Working If the Check Engine light is on and there are one or more sensor trouble codes (especially a coolant sensor code, air temperature sensor code or vehicle speed sensor code), faulty
So the fan runs mostly at idle or low speed when the engine is at normal temperature. Radiator Fan Not Working Symptoms Got a Cooling Fan Relay Problem? Click the Banner Below to Ask an Expert: More Cooling System Related Articles: Electric Cooling Fan Relay Problems Overheating: Causes & Cures Troubleshoot Cooling Fan Clutch Servicing Your Cooling System Your
But the fan should shut off after several minutes as the engine cools down.
If the fuses are intact, switch on the ignition and use a circuit tester to find if there is current at the motor terminals. When Should Radiator Fan Come On WHY ELECTRIC COOLING FANS ARE USED One reason why electric cooling fans are used on many vehicles in place of a belt-driven mechanical fan is to improve fuel economy and reduce All gasoline engines need water to... An A/C system requires acertain amount of refrigerant to cool properly.
The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. Checking the relay for faults Short-circuit the thermo-switch terminals to test the relay. How To Check If Radiator Fan Is Working Neither fan turned on (however, I don't think I waited long enough), i.e., I turned off the engine withing 10-15 seconds of starting it and I did not turn on the Radiator Fan Not Working Overheating To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature.
I suspect the water pump or a plugged radiator. http://clearduplicatefiles.com/radiator-fan/car-radiator-fan-not-working.html How to replace a car thermostat If the engine warms up very slowly, or never reaches normal temperature, or if it overheats quick... Extra cooling is not needed when a cold engine is first started, so the fan does not come on until the engine reaches normal operating temperature (195 to 215 degrees). Ford integrated relay control module (IRCM) (introduced in 1986). How To Test Radiator Fan Relay
The relay is the component that fails most often, so be sure to test the relay as well as its power supply and ground connections. If the fan does not come on, something in the control circuit is defective. The easiest way to do this is to let the engine warm up to a normal operating temperature. have a peek at these guys This is not an instant check, but it can be done by leaving the engine idling for a period of time.
I left it for some time to allow the water cool down before looking for somewhere to park it. Cooling Fan Relay Switch Up next Bad Cooling Fan Diagnosis & Plug Swap "How To" - Duration: 4:26. However, while looking around, I noticed that the car was leaking coolant.
No, create an account now. If the thermo-switch does not operate, the earthing point of the circuit may be faulty. If this vital point becomes obstructed, the flow ofrefrigerant may be restricted or blocked causing a loss of cooling -- and possible compressor damage as well in systems that rely on Radiator Fan Not Working While Driving If this relay fails (which it often does because of the load it carries), the fan may operate at high speed but not low speed.
The fan then continues to run until the coolant temperature drops back below the opening point of the switch. Normally closed. Thecondenser often has its own separate electric cooling fan. check my blog Changing the fan motor Disconnect the battery, and take off the wiring terminals to the motor or disconnect the plug.
This is done by unplugging the radiator fan from its connector and applying 12 volts of power directly to it, along with a ground. Checking the switch for faults A thermo-switch with push-on connections. The problem here is the cooling fan circuit uses a radio frequency filter mounted on radiator fan shroud. Add to Want to watch this again later?
EDIT: Added more troubleshooting steps performed. #1 her209, Mar 28, 2009 Aimster Lifer Joined: Jan 5, 2003 Messages: 16,129 Likes Received: 0 I thought it turned on when the engine Q: How do you know if you need to jump a car battery or replace it? On older applications, fan operation is usually controlled by a temperature switch located in the radiator or on the engine. A: Antifreeze and engine coolant are the same product, sold in the same packaging, and both go into the vehicle's radiator.
ELECTRIC COOLING FAN OPERATION The electric cooling fan is typically mounted behind the radiator. Cody the Car Guy 131,786 views 8:40 Civic EK Radiator support replacement - Duration: 9:00. Loading... EricTheCarGuy 1,631,603 views 26:09 Testing Relays—A Faster Easier Method - Duration: 6:01.
Working... With the type operated by the ignition switch, keep the engine running. Working... If a rubber cover is fitted over the back of the switch, ease it off, then disconnect the electrical connections.
Belt & hose service Coolant Checks & Changes More Complicated These Days Universal Coolant: One Antifreeze For All? Need Help Now? Also they work by completing the ground path to the engine computer input, which in turn will turn the fan on. If the condenser is full of leaves, bugs and road debris, air flow through the unit may be blocked to the point where little cooling occurs.
But this test doesn't tell you if the temperature switch or temperature sensor and PCM are energizing the fan when coolant temperatures are high.