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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Cooling fan runs constant, no A/CViews : 1949 Replies : 8Users Viewing This Thread : |
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Jun 4th, 2012, 05:35 | #1 |
New Member
Last Online: Jan 21st, 2013 05:05
Join Date: Jun 2012
Location: Seattle
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Cooling fan runs constant, no A/C
I have a 2005 S80 AWD with the 2.5 turbo gas engine. The electric cooling fan comes on immediately upon startup with a cold engine, and runs constantly when the engine is on. The fan drops to low speed for about a minute when engine is turned off, then shuts down on its own. In addition, the A/C does not work, the compressor will not engage when A/C is turned on. There is no CEL, and my generic scanner does not detect fault codes or pending codes. However, when I clear codes (even though none exist), the cooling fan turns off and stays off for sometimes a day, sometimes several days or as much as a week before the problem repeats itself. I have changed the engine coolant temperature sensor (located next to thermostat), but that did not fix the problem. I'm completely stumped. Anyone experience this?
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Jun 4th, 2012, 09:07 | #2 |
VOC Member
Last Online: Nov 6th, 2016 10:18
Join Date: May 2009
Location: Blackpool UK
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Thermostat stuck open can cause this but I would expect it to throw a code - Mike
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Jun 4th, 2012, 13:26 | #3 |
2006 S60 T5
Last Online: Aug 14th, 2015 18:52
Join Date: May 2011
Location: hinckley
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get your ac topped up
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Jun 5th, 2012, 03:07 | #4 |
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Last Online: Jan 21st, 2013 05:05
Join Date: Jun 2012
Location: Seattle
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Thanks guys. I had read earlier about low AC pressure causing some issues on older cars. I'll get the AC checked. Could the thermostat being stuck cause the fan to run constant with a cold engine? I suppose, if it was detectable. No retrievable code (with my generic scanner).
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Jun 5th, 2012, 12:50 | #5 |
VOC Member
Last Online: Nov 6th, 2016 10:18
Join Date: May 2009
Location: Blackpool UK
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Yes it does, if the engine temp doesn't climb at the rate the ECU expects then it will turn on the fan as a fail safe, this means that with a stat that's stuck open your end up over cooling an already cold engine! - Been there, done it, only on mine it did thow a fault code (P0115) which was picked up with a generic OBD-II reader - Mike
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Jun 7th, 2012, 05:56 | #6 |
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Last Online: Jan 21st, 2013 05:05
Join Date: Jun 2012
Location: Seattle
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Thanks Mike for the great info. I sure wish I could see that code... something has to be there because I can clear it & the ECM resets and shuts down the fan. I have no problem picking up codes from my BMW with my scanner, so I don't think the scanner is the problem. Seems like the car is running in a fail safe mode for sure. I'm going to take a look at the thermostat. If that isn't it I'll have the AC checked. Thanks again.
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