I wouldn't worry, the L-series is a very cool running engine, and it's fairly noisy so you might not notice the fan cutting in.

Do you have aircon? If you do, switch it on and check the fans, they should come on if the aircon is on.

 

If you don't have aircon you could pull the plug off the temperature sensor which is just near the top of your dipstick (while the ignition is on). That should start it running.
The ECU is designed to switch the fan on as a safety measure if it stops receiving a signal from the sensor, and then run it for 8 mins.
Doesn't sound like a problem if it's just getting up to temp and then staying there though.
BCingU,
En.

 

I tried what you have stated but it still hasnt kicked in im sure its not a big problem it may have smething to do with the temp valve ?

 

You will need to bridge the pins for the fan to turn on.
Cheers

 

Mine switches on as soon as the plug on the temp sensor is disconnected. It does it on my 105 too, so no terminals should need to be bridged on a ZR.
Is the fuse and the relay OK? They are in the box next to your battery.
The fuse is 20A I think and it should be obvious if it's blown.
The relays are mostly the same. Try swapping one with your blower motor to see if it still works.
If still no luck I would check to see if the fan works if you unplug it and apply a voltage directly to it.
If it doesn't, then your fan may be dead.
If it does, then the wiring or even ECU could be at fault.
You need to eliminate them from the equation 1 by 1 (starting with the cheapest/easiest).
BCingU,
En.

 

Chrisund123 is correct. You probably have no problem. Direct injection diesels produce very little heat on tickover. If you leave one idling on your drive the fan may not come on for ages, and even then it may take a hot still day to do so. The main reason is the combustion gases at idle are very diluted on a diesel because there is no throttling. The result is a tiny amount of fuel being burnt in a cylinder full of air.

 

Thanks for all the replys put my mind at rest a bit there. Is it normal for the temp to go up within 5 mins of starting ? Probably paranoid as have had bad experience with overheating in the past! Thanks all

 

Can't be that specific, it depends on how fast you drive. If you start and drive off at 70 mph they warm up fairly quickly, if you drive at 30 mph it can take 10 to 15 minutes for them to warm up properly. If you start and leave on tickover they take ages to warm up, and in winter they may never reach temperature on tickover.

If its not boiling over and loosing coolant I doubt you have a problem.