Radiator fans not turning off!
#1
Rennlist Member
Thread Starter
Radiator fans not turning off!
Hi, 1990 S4.
Suddenly yesterday when I turned my car off the cooling fans continued to run. I popped the bonnet (hood) and they turned off - could not see anything obvious.
I know this has been discussed several times on here but cannot seem to strike that magic set of keywords in search to bring up a thread.
I tried disconnecting temp I & II with no change.
Car temp guage is where it normally sits and plenty of water so I do not think that any overheating is occuring.
Could someone please point me in the right direction of where to look (or an old thread about this)?
The fans eventually do not come back on when you close the bonnet switch but the have run for 30min with the bonnet closed without turning off.
I think that one of the sensors may be mis reading and not turning the fans off until the engine is fairly cool - what do you think.
I am due to go for a 2000km trip in it in a couple of days so would like a quick fix - otherwise I will just pop the bonnet when I stop.
Thanks,
Myles
Suddenly yesterday when I turned my car off the cooling fans continued to run. I popped the bonnet (hood) and they turned off - could not see anything obvious.
I know this has been discussed several times on here but cannot seem to strike that magic set of keywords in search to bring up a thread.
I tried disconnecting temp I & II with no change.
Car temp guage is where it normally sits and plenty of water so I do not think that any overheating is occuring.
Could someone please point me in the right direction of where to look (or an old thread about this)?
The fans eventually do not come back on when you close the bonnet switch but the have run for 30min with the bonnet closed without turning off.
I think that one of the sensors may be mis reading and not turning the fans off until the engine is fairly cool - what do you think.
I am due to go for a 2000km trip in it in a couple of days so would like a quick fix - otherwise I will just pop the bonnet when I stop.
Thanks,
Myles
#5
Rennlist Member
Rennlist Site Sponsor
Either the engine is hotter than you think or the sensor is faulty.
The fans are designed to run after the ignition is switched off if the intake manifold is hot - it is normal operation. Thirty minutes is excessive, though...
The fans are designed to run after the ignition is switched off if the intake manifold is hot - it is normal operation. Thirty minutes is excessive, though...
#6
Rennlist Member
Thread Starter
Thanks,
I have another sensor in an old manifold and (I think) a new one in my intake refresh kit. I will swap and see what happens. At least I know I can do the trip without an issue.
Myles
I have another sensor in an old manifold and (I think) a new one in my intake refresh kit. I will swap and see what happens. At least I know I can do the trip without an issue.
Myles
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#10
Rennlist Member
Thread Starter
Swapping in the old sensor out of the spare intake seems to have solved the problem. Must put a replacement on my next purchase list.
The 'faulty' one read 15 ohms across the two pins when cool. The secondhand one read open line when cool.
Thanks again for the help.
Myles
The 'faulty' one read 15 ohms across the two pins when cool. The secondhand one read open line when cool.
Thanks again for the help.
Myles