V70 cooling fan always running.

Don Winter · Oct 28th, 2017, 15:16

Hi
Im re-posting this as didnt get many replies unfortunately and Im sure someone out there knows an answer? Basically from the moment the engine is switched on til it is switched off the cooling fan runs constantly. With or without AC on still does it.I suspect a faulty control module buw would like to know how to test this before buying a whole new fan.Many thanks. V70 T5 2006.

Clan · Oct 28th, 2017, 16:46

Quote:

Originally Posted by Don Winter

Hi
Im re-posting this as didnt get many replies unfortunately and Im sure someone out there knows an answer? Basically from the moment the engine is switched on til it is switched off the cooling fan runs constantly. With or without AC on still does it.I suspect a faulty control module buw would like to know how to test this before buying a whole new fan.Many thanks. V70 T5 2006.

Not easy to test , you could cut the thin signal wire to prove it is not being instructed to run by the engine ECU , it can easily be joined up again .

savabill · Oct 28th, 2017, 17:14

Does your AC work ok? Mine used to do this when I first bought it, got it re-gassed and its been ok since.

Don Winter · Oct 28th, 2017, 19:05

Thanks Savabill and Clan for your replies;
Clan-is the sensor wire part of the power harness to the fan? I cant see a seperate supply going to the fan module other than the power lead which surprises me?
Savabill-thanks for that I read another post about this and couldent really believe it but with you mentioning it as well Ill try that as my A/C is just barely cool.
Thanks again guys!

INS60T · Oct 28th, 2017, 21:00

+1 on there being an aircon issue.

Clan · Oct 28th, 2017, 21:13

Quote:

Originally Posted by Don Winter

Thanks Savabill and Clan for your replies;
Clan-is the sensor wire part of the power harness to the fan? I cant see a seperate supply going to the fan module other than the power lead which surprises me?
Savabill-thanks for that I read another post about this and couldent really believe it but with you mentioning it as well Ill try that as my A/C is just barely cool.
Thanks again guys!

yes there are only 3 wires to the fan unit , 12 volts , earth and a thin signal wire which sends digital data from the engine ECU to tell the fan how fast to run ... Of course it could be defaulting to ON all the time if there is a problem with the heating or cooling systems , but should not run all the time with everything turned off and the car parked up .

Don Winter · Oct 31st, 2017, 08:26

No it doesent run at all with the engine off.Thanks.

Don Winter · Oct 31st, 2017, 08:28

Im wondering if the water temp sensor isnt working so the ECU is telling the fan to operate at all times?

ASt85 · Oct 31st, 2017, 08:33

Check the cooling fan relay - its mounted under the rear facing left hand side of the black cowling/housing than runs across above the radiator as you look at the car from the front.

They are manufactured to fail in the "relay closed / power supplied" ie on or 1 state to prevent the car overheating when they fail.

Don Winter · Nov 1st, 2017, 17:18

you were absolutely right INS60T.Just got an air con top-up and the problem seems to have been solved now.Thanks a lot!

Oct 28th, 2017, 15:16	#1
Don Winter Member Last Online: Mar 11th, 2018 14:34 Join Date: May 2009 Location: downham market	V70 cooling fan always running. Hi Im re-posting this as didnt get many replies unfortunately and Im sure someone out there knows an answer? Basically from the moment the engine is switched on til it is switched off the cooling fan runs constantly. With or without AC on still does it.I suspect a faulty control module buw would like to know how to test this before buying a whole new fan.Many thanks. V70 T5 2006.

Oct 28th, 2017, 17:14	#3
savabill Master Member Last Online: Today 11:29 Join Date: Aug 2013 Location: doncaster	Does your AC work ok? Mine used to do this when I first bought it, got it re-gassed and its been ok since. __________________ Only My Opinion: Good luck. Bill NOW 59 REG 2.5T V70 Ice White SOLD 55 REG T5 V70 Ruby Red

Oct 28th, 2017, 19:05	#4
Don Winter Member Last Online: Mar 11th, 2018 14:34 Join Date: May 2009 Location: downham market	Thank you Thanks Savabill and Clan for your replies; Clan-is the sensor wire part of the power harness to the fan? I cant see a seperate supply going to the fan module other than the power lead which surprises me? Savabill-thanks for that I read another post about this and couldent really believe it but with you mentioning it as well Ill try that as my A/C is just barely cool. Thanks again guys!

Oct 31st, 2017, 08:33	#9
ASt85 Premier Member Last Online: Today 08:06 Join Date: Aug 2010 Location: Walderslade....Kent	Check the cooling fan relay - its mounted under the rear facing left hand side of the black cowling/housing than runs across above the radiator as you look at the car from the front. They are manufactured to fail in the "relay closed / power supplied" ie on or 1 state to prevent the car overheating when they fail. __________________ The saddest moment is when the one who gave you the best memories....becomes a MEMORY V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto

Nov 1st, 2017, 17:18	#10
Don Winter Member Last Online: Mar 11th, 2018 14:34 Join Date: May 2009 Location: downham market	you were absolutely right INS60T.Just got an air con top-up and the problem seems to have been solved now.Thanks a lot! Last edited by Don Winter; Nov 1st, 2017 at 17:25.

Oct 28th, 2017, 21:00	#5
INS60T Junior Member Last Online: Dec 29th, 2023 20:33 Join Date: May 2015 Location: Beauly-ish	+1 on there being an aircon issue.

Oct 31st, 2017, 08:26	#7
Don Winter Member Last Online: Mar 11th, 2018 14:34 Join Date: May 2009 Location: downham market	No it doesent run at all with the engine off.Thanks.

Oct 31st, 2017, 08:28	#8
Don Winter Member Last Online: Mar 11th, 2018 14:34 Join Date: May 2009 Location: downham market	Im wondering if the water temp sensor isnt working so the ECU is telling the fan to operate at all times?

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