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Cooling Fan Not Working


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16 replies to this topic

#1 wrongturninwv

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Posted 11 February 2009 - 01:58 AM

Same 95 Impreza 2.2 I been working on for my son. Last owner did nothing but drive it. So far put new rear seal in trans, changed oil, new antifreeze and thermostat. Fixed power steering pump leak and put new belts on. Still have to replace front left cv joint that has no boots. Want to get cooling fan to work. Checked both fuses, not blown. How do I test fan with out frying it ? And if fan is good what else can it be. Checked plug leads from fan and they are clean. Need some help. thanks

#2 Rooster2

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Posted 11 February 2009 - 10:28 AM

Don't know where to tell you to look, but I think there is a sensor somewhere in/on the cooling system that turns on the cooling fans.

I think you can check to see if the fans are good by disconnecting the wiring connector, then "hot wiring" directly to 12V. I don't think it makes any difference which of the two wires is connected to positive to see if the fan s work. Connected one way, the fan blades turn clock wise, connected the other way the blades turn counter clock wise.

If this car has an automatic trans, suggest you drain and replace the ATF. There is a drain plug that is exactly like the oil pan drain plug for draining the ATF on the bottom of the trany. Subaru makes it easy to change the ATF. Unfortunately, only about half of the ATF can be drained at one time, the remaining ATF will not drain from the torque converter. So the ATF need to be changed at least three times, and driven between changes, to finally get a good overall fluid change.

Sounds like you are doing all the good maintenance on the car that it desperately needs. Hope your son is helping you with the work as well. It is a good opportunity for him to learn about car maintenance.

#3 Cougar

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Posted 11 February 2009 - 12:24 PM

Good advice from Rooster2. You can hook power directly to the fans to check them out. They may be controlled to turn by a sensor and through the ECU. You should also be able to test them by tieing the diagnostic connections together.

#4 rverdoold

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Posted 11 February 2009 - 01:58 PM

There is an other selftest for the cooling fans (if ODBI), at least in a Legacy I. However i suppose it is not much different in the old impreza. If i connect the CEL readout- connector (black one under steering column) and the green T-shaped connector next to it (its for long test run) the cooling fan will turn it self on and off at interfals of a few seconds. You can also do the self test and see for more errors in sensors. Only if OBDI though good luck.

Its the so called D-check mode

#5 wrongturninwv

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Posted 11 February 2009 - 02:17 PM

Thanks guys for the great info. Son seems be be helping if I can keep him out there long enough to watch and learn. First thing he has to learn is you dont have to run into the house and wash your hands every time you get some grease on them. Seems to be more worried about cleaning out the inside car then about if its gonna run right. Way out in the sticks here so have no where to work on car but outside. Will check out fan again. Had same problem on another Impreza but its been so long ago I forgot what I did to fix it. Thanks again

#6 johnceggleston

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Posted 11 February 2009 - 02:26 PM

95 legacys have 2 fans, one comes on when the ac turns on one comes on when the cars needs cooling, i think.

is the car overheating?
one or 2 fans on the impreza, one or 2 not working?

#7 wrongturninwv

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Posted 11 February 2009 - 03:09 PM

The ac not running. No belt pump froze up. Not worried about that one . Its the fan on passenger side not working. Did not test fan yet. Where is the relay that tells fan to turn on and off ??? Or what controlls fan ??? thanks

#8 Sundance

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Posted 11 February 2009 - 05:10 PM

I realize the A/C is not working, but throw the A/C
switches to ON and see if one of the fans runs.

I agree it's probably a sensor.

#9 Cougar

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Posted 11 February 2009 - 06:17 PM

The main fan relay is on the left side under the dash. The A/C relay is in the relay panel.

You haven't really stated that you are sure that the fan operation is actually a problem. Are you sure the fan isn't working due to a problem, because normally it doesn't turn on unless the coolant starts to overheat.

I recommend you first connect the diagnostic connections together under the dash to test the fan circuit.

#10 msmithmmx

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Posted 11 February 2009 - 07:24 PM

There is a way to test both fans, in the driver side under the dash are 2 green connectors, plug them together and turn the car on but do not start it. Both fans should come on. There are others ways, let me know if that works.

#11 wrongturninwv

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Posted 12 February 2009 - 05:35 PM

Thank you for the great info. I did that test by hooking up the 2 green wires under dash. Both fans came on and work great. So now is it the relay you talked about under the dash ??? If so whats it look like and on what side is it. thanks

#12 msmithmmx

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Posted 12 February 2009 - 07:12 PM

The relay is fine, you tested it with those green connectors together. Are you concerned that the second fan is not coming on? You could also test out the whole ckt by pulling the plug on the temp sensor, that would starts the fans as well. That would leave you then with a temp sensor.

#13 wrongturninwv

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Posted 12 February 2009 - 11:16 PM

Not concerned about second fan. I ts the main cooling fan on far right side that is not coming on when car comes up to heat. Fan not coming on no matter how long you run car. New thermostat changed antifreeze and checked fuses and fans. thanks

#14 Cougar

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Posted 12 February 2009 - 11:48 PM

It doesn't matter how long the car runs. Unless the temperature gauge gets into the hot zone the fan should not turn on. By doing the test you proved that the fan circuit is good, though it did not prove the temperature sensor is ok. That is bypassed with the test.

#15 johnceggleston

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Posted 13 February 2009 - 12:01 AM

It doesn't matter how long the car runs. Unless the temperature gauge gets into the hot zone the fan should not turn on. By doing the test you proved that the fan circuit is good, though it did not prove the temperature sensor is ok. That is bypassed with the test.


plus, if the car never runs hot, what difference does it make if the fan works. as long as it runs cool it's ok. take it on the hiway for 15 minutes and then pull over and idle. if it runs cool it's ok. re check in 3 and 6 months.

#16 wrongturninwv

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Posted 14 February 2009 - 06:55 PM

It was the Coolant Temperture Sensor !! Not an easy thing to find or get at. Its buried under a bunch of other wires. If anyone else has problem finding it, my best way to explain is follow the hose from your PCV down to where it clamps to intake manifold and you will see a brown plug under a bunch of wires that goes to the CTS on your right. A 17mm deep well socket gets it out. Getting the connector off was my biggest problem. A job for someone with small hands to get in there. But now the cooling fan works. Thanks guys for all your help. This site has saved me hundreds of dollars ( that I dont have ) in repairs if I had to take it in to a shop and have the work done on my cars. My son is happy and so am I, and im happy my sons first car is a Subaru. thanks for all the help:banana:

#17 Cougar

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Posted 14 February 2009 - 07:22 PM

Thanks for the update and info on this and glad you found the trouble.




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