On the 5.0L engine the thermostat starts to open at 190*F and is fully open at 205*F. My 2012 runs at 200*F in normal temps from 32*F to 95*F outside temps. Very rarely do I hear my coolant fan running and so far it has never run after I have shut down the engine after a long run in 85* temps.

 

 

My 2007 has 82K miles and I've owned it for one year. The radiator fans frequently run in warmer weather after shut down (like now, with ambient high air temps in the 90's.) I've replaced the thermostat housing which contains the engine temp sensor, all hoses, and the coolant reservoir. The fan behavior is largely unchanged after all of that, and they will run for a few minutes after shut down.

 

 

My 2007 XK has the exact same thing going on. Fans stay on for a few minutes (between 1-3, sometimes more) after engine shutdown. I have both the iCarSoft scanner and the Torque App With OBDII mini tool so I’m going to check my running temp later today.

Any update on your running temp Brewtech?

Keen to see if this is normal or if I need to address cooling system components like you did before Summer. Something I planned on doing anyways, now just sooner. Not having some sort of temp indicator is probably my only gripe about my XK so far as it is probably one of the, if not the most important data sets a driver needs on a live basis. Everything else has been outstanding, thanks for convincing me to get an X150 BT.

-Indy

 

My 2008 xk fans typically stay on after shutdown. Depending on ambient, between 30sec to 4 min.
Last summer when ambient was 112(f), I live in Texas, I saw 218 water temp once or twice in city traffic. Typical running temps are 195~205.
wj

 

The only time Ive had fans stay on for fairly prolonged periods during a shutdown, have been on the occasions that my thermostat is on its way out.

I'm onto my 3 thermostat and always have a spare lying around just incase

 

My first indaication my plastic thermostat manifold had failed was fans running on, No alarm on dash. so investigate!

 

The only alarm you will get is temp too high switch car lol...Ive never pulled a code off failing thermostat it's always been fans running after switching vehicle off

 

My thermostat works precisely as per the workshop manual.
And yes, as designed; the fan does come on, on occasion after shutdown. In the most entertaining of driving sessions, it may flip on and off a couple of times.

Cheers

 

To change the functioning of the cooling fan there are two changeable parts. The thermostat may be a hot one. Replacements can run from 85C to 92C. Maybe if you are using a hot one, then the fan comes on more frequently. The other, maybe off calibration. The temp sensor in the thermostat housing may be sending the message to the computer, that you are hotter than you really are.
I have a little OBD2 wired gauge for temp that shows me running at 85 to 87C. So no fan is needed.

 

My 2007 XK did that also. Fan running after engine shutdown. It was the thermostat. Once it was replaced the fan did not run on after engine shutdown. FWIW

 

Some info for people who may be confused...........
This THERMOSTAT is the electronic fan-control thermostat, NOT the engine coolant thermostat.

 

And, the fan is activated by the ecm, that takes input from a few temperature sensors…

 

I have spent WAY too much time researching this problem on my '07 XK convertible. I have used my Autoenginuity with Jaguar software to read a large number of sensors over many drives, varying ambient conditions, and off and on over 6+ years. In my case, the fan, if on, will start to wind down for a second or two after shutting off the engine. Most of the time (but not always), it will then come back on and run consistently at 50% duty for 4 minutes and 0 seconds, +/-1 second. This led me to believe that a sensor triggers the ecm to trigger the fan control module to run the fan for the prescribed conditions. Note that changing the engine thermostat, for other reasons, had no effect. This didn't surprise me since the engine temperature has been in the acceptable range when I recorded it on many occasions. In the end, I decided to just live with the issue since it doesn't do any harm. I had the opposite occur in my '11 XJ where the fan did not come on and that has a MAJOR impact ($$$) if not discovered in time (I didn't).

The '07 XK has one other temperature-related quirk - the external temperature reading on the touchscreen reads 5 degrees high. I doubt this is related to the fan issue. I just need to calibrate myself when I get in the car since my '13 XK coupe has neither problem.

Dan

 

Often people speak of changing the thermostat to correct the fan run on. Take the approach that the thermostat is too hot and a cooler one, would be better. Mine runs at 85C to 87C. Never more. The range offered in the market can be from mine, up to 92C. In the future, try a cooler one. Just don't let the garage decide for you.
All engines heat up a bit more when turned off, then the cooling cycle starts.