Cooling fan staying on after turning off engine - Volvo Forums

02VolvoS40 · #1 10-02-2009, 08:22 PM

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?

tech · #2 10-02-2009, 08:26 PM

Check engine light on?
You might have a bad ECT or thermostat.

Lyonsroar · #3 10-03-2009, 10:22 AM

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.

91e30181 · #4 10-05-2009, 07:06 PM

Had the same issue and it was the thermostat

02VolvoS40 · #5 10-11-2009, 11:18 PM

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.

tech · #6 10-12-2009, 07:34 AM

It could still be the ECT or maybe the cooling fan is not turning on all the time.

Lyonsroar · #7 10-12-2009, 09:45 AM

Quote:

Originally Posted by tech

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.

02VolvoS40 · #8 10-13-2009, 01:38 PM

Quote:

Originally Posted by tech

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?

tech · #9 10-13-2009, 07:27 PM

Yes it is a good idea.

Lyonsroar · #10 10-13-2009, 08:38 PM

I got away with just replacing the thermostat.