wierd temp gauge goings on ??

Hi chaps bought or well took a TD5 disco in part exchange on my P38 few weeks back but the temp guage has a bit of a mind of its own here is an idea of what it does...

First start of the day key in starts up all is normal 5 miles down road all is well temp at half way no issues at all what so ever nice hot heaters the lot never goes over half temp ok...

Switch off pop in the shop or something come back out when engine is already up to temp or has been and is still warm etc and 6/10 times when i stick the ignition on ready to start with all the warning lights illuminated before cranking the temp guage goes to current temp for a few seconds then zooms back to below the blue sticks the red over heat light on at the top of the temp gauge unit and stays there, now if i start and drive it basically just stays at bottom no matter how hot or cold the engine is, but if i turn the ignition key off and on again it might reset and go back to normal or it might take 3/4 go with ignition key to reset it to current temp then its fine till its switched off again....

any ideas chaps its not running hot or over heating or anything i can see anyways...

:scratching_chin:

try the wire on the sensor near the exhaust manifold, give it a clean, could be a bad earth, or faulty sensor,

Will do dave will try that today mate cheers will keep you posted

neo2 said:

Will do dave will try that today mate cheers will keep you posted

Click to expand...

Hi both. I have the same problem on my 51 plate Disco 2
Did this solve the problem?
Any more thoughts?

Thanks

Klm2 said:

Hi both. I have the same problem on my 51 plate Disco 2
Did this solve the problem?
Any more thoughts?

Thanks

Click to expand...

just try what was suggested and see if that works.

I have the same problems on my 51 plate. Found out by accident what triggers the gauge to suddenly drop and the red light to come on. It only happens on mine when I switch the aircon on to automatic, and a short while after the needle drops right to the bottom on the gauge. Turn the aircon off, and start the engine again and its all ok.
Just wondered if it is this that is triggering the other disco's on this link?:scratching_chin: