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  #1  
Old 10-02-2009, 08:22 PM
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Default Cooling fan staying on after turning off engine

Today, I noticed that the cooling fan of my 2002 S40 is staying on a couple minutes after I turn of my car. It's been much cooler lately then compared to the summer, so this has me confused. A search yeilded that I should clean my MAF sensor. I guess that's the first thing I'll do. However, if that doesn't do it, does this symptom relate to any other problems with the S40?
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  #2  
Old 10-02-2009, 08:26 PM
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Check engine light on?
You might have a bad ECT or thermostat.
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  #3  
Old 10-03-2009, 10:22 AM
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MAF, MAF, MAF, MAF!

The only time mine ever ran on was when I ran the car without the MAf plugged in (on accident!)

Clean it and reevaluate.
There is a how-to link in the Sticky Frequently Asked Questions thread.
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  #4  
Old 10-05-2009, 07:06 PM
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Had the same issue and it was the thermostat
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  #5  
Old 10-11-2009, 11:18 PM
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Thanks for all the replies. Well, I finally found some time to clean my MAF sensor (family calls). This was after my wife was driving it the other day and said that the car started to "overheat" before she turned the heater on full blast and rolled down the windows and then it was all good. So I went and bought the MAF cleaner and cleaned it up. I drove it to the store the next day and everything seemed fine. I parked and sure enough, the fan stayed on. My first thought was that I guess I need to buy a new sensor. Then, on the way back, I turned on my A/C and hot air started coming out and noticed my temp gauge started to rise. I turned off the A/C and it went back down. I turned on my A/C a minute later and had no problems and worked fine. Very strange. So now I'm thinking it's something a little more serious. There are no check engine lights or anything else on. Any other thoughts and should I check the codes despite not getting any check engine lights? One other thing I left out previously was that I noticed my fan was running louder then normal while I am driving, but I figured that went hand-and-hand with it staying on after I turned off the car.
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Old 10-12-2009, 07:34 AM
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It could still be the ECT or maybe the cooling fan is not turning on all the time.
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Old 10-12-2009, 09:45 AM
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Quote:
Originally Posted by tech View Post
It could still be the ECT or maybe the cooling fan is not turning on all the time.
I'll let you take over. This is out of my league.
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Old 10-13-2009, 01:38 PM
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Quote:
Originally Posted by tech View Post
It could still be the ECT or maybe the cooling fan is not turning on all the time.
Ok, thanks. I guess I need to find out how to fix the ECT. Is it usually a good idea to replace both the ECT and thermostat at the same time?
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  #9  
Old 10-13-2009, 07:27 PM
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Yes it is a good idea.
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Old 10-13-2009, 08:38 PM
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I got away with just replacing the thermostat.
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  #11  
Old 10-14-2009, 11:50 AM
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Yeah, I just priced them at Autozone and it would be smart just to try the thermostat first:
$65 for the ECT
http://tinyurl.com/yjvj6vt

compared to just $6, $9 or $10 for the thermostat:
http://tinyurl.com/ykxftlz
By the way, what's better for our car - 160, 180 or 192 degrees? Or does it matter?
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  #12  
Old 10-14-2009, 08:17 PM
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Well, I just got the thermostat and will know if that does the trick when I finish my commute tomorrow morning. I did notice one thing on the way home that might help diagnose the problem if that's not it. My temp gauge would raise when I was stopped at a red light just idling. I even had to turn off the A/C if I sitting too long. The rpm's weren't up or anything, just the temp gauge. It would go back down after acceleration. Tech, does that sound like anything else to you or does that still narrow it down to the ect and/or thermostat?

Last edited by 02VolvoS40; 10-14-2009 at 08:29 PM.
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  #13  
Old 10-15-2009, 09:52 AM
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Same thing.
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  #14  
Old 10-15-2009, 11:35 AM
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It's fixed! The thermostat seemed to have fixed the problem. Thanks to all that helped! Total cost to fix my car was $6 for the MAF cleaner and $10 for the thermostat. Who knows what it would have cost to take it somewhere.

I also noticed my radiator fluid was very low. I hope there's not a leak, but that shouldn't be too bad. I don't know if that's what helped ruin the thermostat, but probably something to mention to check for in case someone else that may search and come up with this thread in the future. Anyway, thanks again.
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  #15  
Old 10-15-2009, 01:17 PM
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Huzzah!
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  #16  
Old 10-15-2009, 07:32 PM
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Now hopefully the ECT does not go bad in a week.
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  #17  
Old 10-15-2009, 08:28 PM
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Quote:
Originally Posted by tech View Post
Now hopefully the ECT does not go bad in a week.
Yeah, that would be some good luck!
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  #18  
Old 10-08-2013, 06:45 AM
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Default Ect

Congrats on the fix! So the thermostat was the problem then. I have had the same symptoms, except the temp gauge never deviates at all it gets to optimum temp and stays there. What I have is the idle is abnormally low.

Last edited by jbjs40; 10-08-2013 at 06:52 AM.
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Old 10-08-2013, 06:45 AM
 
 
 
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2000, car, cooling, engine, fan, fans, forum, long, overheat, runs, s40, s60, s80, staying, turn, volvo


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