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Testing udqt24lg3 fan - HP Compaq Presario SR1265CL-B (82916053448) PC Desktop

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2 Answers

My 01 toyota corolla le radiator fans wont work


Using a test light connect the lid to NEGATIVE and start the engine with A/C on.back probe the positive terminal on the fan.If no power test the fuse. if fuse OK switch the relay with the horn relay and test again. if you have a power to the fan connector switch the test light lid to POSITIVE on you battery and test for good ground to the fan.some times ground wire can corrode and create a lot of problems. If you have good Power and Ground replace the fan.
good luck

Mar 01, 2015 | 2001 Toyota Corolla

1 Answer

I want to see if my radiator fans are operational so I want to wire it directly to the battery. The problem is do I wire both negative and positive?


Wish you had stated make/model here.
Before 'hotwiring' fans - test to see if power is actually going to fan(s) - on most cars with two fans - one is ran from engine temp sensor, while the other is run from the A/C system (and for example on Nissan Maxima will not run unless A/C is actually on).
To test get a simple test light - with car at temp test the positive to negative connection at the wire harness connector (should be near fan). Also, test positive to a good ground point. This way you know if power is going to fans.
To 'hotwire' an individual fan - unplug fan from harness - using same grade of wire (2 wires one from positive side of battery to positive input of fan harness, 2nd wire from negative side of connector to a known good ground). - fan should run at that point - if it doesn't and power to harness, replace fan.

Nov 24, 2014 | Cars & Trucks

1 Answer

Radiator fan


remove the relay and test it across the battery ,the two big connectoprs are the fan power supply and two smaller ones are the relay ,test the smaller one across the battery and see if it clicks ,if they click then test the big ones for continuety when the small ones are connected and gone click .Simple if all ok then test for power in the big connectors in the relay holder ,one of them should read a permanant 12v supply

Dec 27, 2013 | Mercury Tracer Cars & Trucks

2 Answers

Exhaust fan and lights do not work


see this steps and fix it. God bless you
Switch If the range vent hood fan and light are not working the switch might be defective. Watch our video on switch testing and test this switch for continuity.

Selector Switch If the range vent hood fan and light are not working the selector switch might be defective. Watch our video on switch testing and test this switch for continuity.

Rotary Switch If the range vent hood fan and light are not working the rotary switch might be defective. Watch our video on switch testing and test this switch for continuity.

Rocker Switch If the range vent hood fan and light are not working the rocker switch might be defective. Watch our video on switch testing and test this switch for continuity.

Switch Kit If the range vent hood fan and light are not working the switch kit might be defective. Watch our video on switch testing and test this switch for continuity.

Micro Switch If the range vent hood fan and light are not working the micro switch might not have continuity. The best way to test the switch is with an Ohm meter. See our switch testing videos for help testing this micro switch.

Thermal Fuse If the range vent hood fan and light are not working the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Main Control Board If the range vent hood fan and light are not working the main control board may be defective.

User Control and Display Board If the range vent hood fan and light are not working the user control and display board may be defective. Check other causes before ordering this board.

Oct 02, 2012 | Dacor Millennia DHI602 Kitchen Hood

1 Answer

I have a 1997 mazda protege LX . I am suspecting


use a test light and probe the wires .some fans don't work both at the same time so it maybe necessary to let the car reach operating temp to see if there is power and ground to the fans.

Jul 17, 2011 | 1997 Mazda Protege

2 Answers

How do i test the fan if i already replaced the relay and the fan switch and it still doesn't work? What else could be the problem?


you could apply 12v battery power directly to the fan itself...there should be 2 wires coming from the center of the fan, follow these and you should come to a plug that you can un hook as if to remove the fan. on the fan side of the wires, hook them to 12v power, one wire + one to - if the fan does not turn, switch the wires polarity and test again. ( the fan should run either way, polarity just dictates direction of rotation) if the fan spins, the problem is on the car side. if not the fan itself is suspect. test vehicle side with known good fan or test light.

Mar 24, 2011 | 1992 Toyota Corolla

2 Answers

Electric Radiator Fan Does Not Come On


Chevy dealer says will not come on until temperature reaches 219 f

May 16, 2010 | 2007 Chevrolet Silverado 1500 2WD

1 Answer

Where is the switch that cuts on the cooling fans on a 2000 grand am with a 3.4 engine


The computer turns on the fan. Based on sensors from the motor.
DTC P0480 - COOLING FAN CIRCUIT

Circuit Description

The cooling fan is controlled by PCM through the fan relay based on inputs from ECT sensor, IAT sensor, A/C selector switch, A/C refrigerant pressure switch and vehicle speed sensor. PCM controls cooling fan by grounding cooling fan control circuit which turns on cooling fan relay.

The fan relay will be commanded on when ECT reaches 223°F (106°C) or greater, A/C is requested or vehicle speed is less than 38 MPH. Cooling fan relay will also be commanded on regardless of vehicle speed when a DTC is set requesting cooling fan to be on, ECT is 304°F (151°C) or greater, or A/C refrigerant pressure is high. Cooling fan may also be commanded on when engine is not running, on certain conditions.

Conditions for setting DTC:

Battery voltage greater than 9.5 volts.

Cooling fan fault line detects a malfunction for 6 seconds.

1. Check cooling system. Ensure coolant level and belt tension are correct. Adjust/repair as necessary. After repairs, go to step 23). If no adjustment or repairs were required, go to next step.

2. Turn ignition on, with engine off. Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). If cooling fan is off, go to next step. If cooling fan is on, go to step 4).

3. Command cooling fan relay on. If cooling fan operates, go to step 23). If cooling fan does not operate, go to step 5).

4. Turn ignition off. Disconnect PCM harness connector. If cooling fan turns off, go to step 23). If cooling fan does not turn off, go to step 6).

5. Disconnect cooling fan relay harness connector. Using a test light connected to ground, probe battery feed circuits in relay harness connector. If test light illuminates on both terminals, go to step 7). If test light does not illuminate on both terminals, go to step icon_cool.gif.

6. Disconnect cooling fan relay harness connector. With test light connected to ground, probe battery feed circuit in relay harness connector. If test light illuminates, go to step 9). If test light does not illuminate, go to step 10).

7. Connect a jumper wire between cooling fan relay battery feed and cooling fan battery feed circuit. If cooling fan operates, go to step 11). If cooling fan does not operate, go to step 12).

8. Repair open in battery feed circuit. After repairs, go to step 23).

9. Repair short to voltage in cooling fan battery feed circuit. After repairs, go to step 23).

10. Connect test light battery voltage and probe cooling fan control circuit. If test light illuminates, go to step 13). If test light does not illuminate, go to step 21).

11. Connect test light to battery voltage and probe cooling fan control circuit. Using scan tool, command cooling fan on. If test light illuminates, go to step 14). If test light does not illuminate, go to step 15).

12. With jumper wire still connected, disconnect cooling fan harness connector. Using test light connected to ground, probe cooling fan battery feed circuit. If test light illuminates, go to step 16). If test light does not illuminate, go to step 17).

13. Repair short to ground in cooling fan control circuit. After repairs, go to step 23).

14. Check terminals to cooling fan relay. Repair as necessary. After repairs, go to step 23). If terminals are okay, go to step 21).

15. Check cooling fan control circuit for open or poor connection. Repair as necessary. After repairs, go to step 23). If circuit or connection is okay, go to step 22).

16. Connect test light to battery voltage and probe cooling fan ground circuit. If test light illuminates, go to step 1icon_cool.gif. If test light does not illuminate, go to step 19).

17. Repair open or poor connection in cooling fan ignition feed circuit. After repairs, go to step 23).

18. Check for poor connections at cooling fan harness connector. Repair as necessary. After repairs, go to step 23). If connections are okay, go to step 20).

19. Repair open or poor connection in cooling fan ground circuit. After repairs, go to step 23).

20. Replace cooling fan motor. After replacing cooling and motor, go step 23).

21. Replace cooling fan relay. After replacing relay, go to step 23).

22. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.

23. Turn ignition on, with engine off. Command cooling fan on. If cooling fan operates, system is okay. If cooling fan does not operate, repeat step 1).

May 16, 2010 | 2000 Pontiac Grand Am GT

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