Radiator fan not working..any ideas?

Question

changed the temp sensor and it still doesnt work...checked relays and fuses,still doesnt work! the fan works cause i turn it on manually and cools the car,could it be the thermostat? if its not that, what can it be? i checked all fuses and relays in the fuse box,is their somewhere else i should be checking? ford mustang V6 2005...it started over heating ever since my temp sensor popped out,so i figured it got damaged when that happened, but i put a new 1 and it still dont work(fan)

Answer 1

Make sure you're getting a good connection at that connector. What happens is that when the fan motor ages through constant heating and cooling, it creates higher resistance in the windings and requires a bit more amps than it previously needed. This in turn will cause the weakest connection to over-heat and warp the electrical terminal and housing causing an even worse connection. It may not be your exact problem but it's certainly the most common. Please also note that it does take a long time for an engine to reach the temp needed for the fan to come on and also if there is trapped air in your system that it may be preventing the coolant from touching the sensor thus giving it a cooler reading than it actually is.

Answer 2

Without being able to ask you a question I have to make an assumption. It sounds to me like you are mixing apples and oranges. At one point you talk about the radiator fan and at another you say you can turn it on and it cools the car. If my interpretation is correct you are talking about two different fans. One is right behind the radiator and the other is somewhere in the dash board.



Again with my interpretation, I am assuming the engine is overheating. The Temp instrument or light on the dash is either climbing toward the red or illuminating. With that assumption I suggest you open the hood, start the engine and turn the Air Conditioning on to maximum. In most cars the A/C turns the fan on and keeps it on as long as the A/C is operating. If the fan works then the problem is in the sensing portion of the system. If the fan doesn't work the problem could be a bad fan. A fairly good shade tree mechanic should be able to help you out a lot more than I can on Y/A.



Good luck and email my profile if you try my suggestion.



GIMP

Answer 3

You have 2 radiator fan relays Low speed and Hi speed. The control circuits in these relays is powered by fuse #40 (15A). Turn the key to RUN and yank the 2 relays. Test for power on terminal 86 of the relay socket. If you have power, start the engine turn on A/C to MAX and let engine warm up. Now test for ground at terminal 85 of the socket. The PCM controls the relays by toggling GROUND (not power) on and off to the 2 relays. If the PCM never provides ground and the vehicle is overheating, then the PCM is not getting good temp data from the engine coolant temp sensor.



If the PCM IS providing ground to the relay socket but the fan isn't running with the relay in place, then you've either got a bad relay or an open between the relay socket and the fan. Or, you've got a bad ground at the fan motor.

Answer 4

I own a 2005 4.0L V-6 with no radiator cooling fan at low speed. Problem was in fuse block connection beneath the low speed fan relay. It was either replace the harness or install another low speed relay external to the fuse block. External fan 40 amp external fan relay installed with a Maxi fuse 40 amp fuse in the secondary circuit. The primary circuit to close the relay came from the engine fuse #40. The fan runs on low continuously and high come on when the AC is running. Cost me nearly $600 for the mechanic to diagnose, replace the radiator fan

assemly, and perform the wiring work around.

Answer 5

Even if the fuse looks fine, get a new one then take it from there! Something is interrupting the electricity otherwise it would work fine. Check the fuses one by one. You might have read the wrong one in the box. That happens also. No biggy. Just do an all out electrical check up. Lastly, check your relays. Have an electro-mechanic check it for you since not too many people know where the relay is after they find out what a relay is.

Answer 6

You put battery 12V straight to the radiator fan and it turned? Then you have to go back through the cooling fan circuit checking the nest thing in line.



The thermostat has nothing to do with the problem.

Answer 7

This Site Might Help You.



RE:

Radiator fan not working..any ideas?

changed the temp sensor and it still doesnt work...checked relays and fuses,still doesnt work! the fan works cause i turn it on manually and cools the car,could it be the thermostat? if its not that, what can it be? i checked all fuses and relays in the fuse box,is their somewhere else i should be...

Answer 8

Try testing fan clutch

Answer 9

If you knew how to "check" the relays, you'd know how to tell what was wrong. Take it to someone who knows how to use a voltmeter.

Answer 10

could be the wiring