So once again, sorry if I caused any confusion, should of asked the age of your vehicle first and then double checked the facts! Good luck though, this should give you some new leads to look at such as the relay and fuse F28, if either of these arent in good shape then the fan wont work.
Please can you advise me how to fit new gearbox temperture sensor on my 2.5 Diesel P38?first of all, do you have fog lights fitted in the bumper at the front??
if you do then thats your problem, the auto diesels were never designed for the front fog lights to be fitted into the bumper as the gearbox cooler is right behind the bumper on the passenger side where the fog light should go.
If not then have you checked the sensor?? I would begin with checking the sensor connections, make sure they are clean and making good contact. Next if its still bringing the message up get one of those gun infrared temp guns (not much from Maplins) and when its actually claiming that the box is overheating, stop, get out and check to see if it is overheating - i.e. check the gearbox radiator for its temp, also check the lines to and from it.
If its not overheating then you have a faulty temp sensor, if it is overheating then I would assume there may be a blockage somewhere at some point, probably in the gearbox rad.
Let us know how you get on.
-Wills
Chris Bright
Ok, first of all, the gearbox rad should have NO electric fan. Its cooled by ram air only so it looks almost like someone has had problems and tried to throw something toghether as a fix.
The sensor is located on the rad from looking at RAVE (well it is on the V8 models, it doesnt say about the diesel models but if it was different I would of assumed it would say). You should grab yourself a copy of RAVE and look through the info in there for help. Get that from here.
According to the electronic troubleshooting manual that comes with RAVE the sensor connects to the wiring harness via connector C164 which is that connector you see if you open the bonnet and look on the side of the rad behind the power steering pump reservoir...
and to show the entire circuit...
If the gearbox temp exceeds the acceptable temp (according to RAVE - 120-130*C) then the temp switch is earthed and the overheat message flashes up. This message clears when the fluid temp returns to between 82 and 88*C.
So, if it was me, I would follow the wires from the connector down to the rad and check the sensor is located and attached properly. Check the wiring to the sensor for any nicks or damage which could cause it to short out on something. If all appears fine I would honestly try the infrared temp gun thing to try and verify whether there is any overheating present or not. I used one to solve my engine overheating problems that I had recently. If it isnt electrical then I would seek the advice of a specialist s trying to diagnose something like this over the net without seeing teh vehicle is pretty difficult
Let us know how you get on or what you find...
-Wills
I would suggest downloading RAVE so you know how to do things in future, or, at the very least, have a basic understanding of what you need to do before asking
To change the gearbox temp sensor - remove the front bumper, two bolts, two clips and then flip the wheel arch trims over the edges of the bumper and slide bumper off. locate sensor on side of rad, unscrew two screws, unplug sensor. refit is reverse of removal.
-Wills
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