E39 M5 oil temp and coolant temp off the scale

[fatmansv8]

Hello all wondering if anyone can relate or help with my M5. I was driving along on the motorway doing no more than 60 - 70 mph as usual I glanced at the gauges and the engine coolant temp went off the scale and the oil temp was reading aroung half way . The car still ran ok this has happened a few times now, all motorway journeys. After pulling over and checking the coolant level and oil levels all were normal . After switching the engine back on the gauges read normal. Any ideas guys please.
Thank you FatmansV8

[fatmansv8]

Ouch don't like the sound of that man .
Thanks FatmansV8.

[fatmansv8]

Ouch don't like the sound of that man .
Thanks FatmansV8.

[fatmansv8]

Hi Simon hope your well . Yeah sat nav is A OK thank you. Got yourself another beauty hey, congratulations man . I'm pretty sure the oil temp goes up as soon as the temp goes off the scale. The oil temp is normally around just over the quater mark and heads for the hundred mark when the temp goes crazy. I'll have another look when it happens again.
Thanks Simon
FatmansV8

[fatmansv8]

Is that that the name of the part a coolant temp switch . And it's located on top of the thermostat. I think I'll get both changed. Thanks guy's .

[fatmansv8]

Right I did a trip to work and the coolant temp went as expected past the red the oil temp went to around 75 to 80 are we still talking coolant temp switch on the thermostat . Anyone out there with a part number from BMW please .
Thank you
FatmansV8

[fatmansv8]

Thanks RichardM5 your a star .
FatmansV8

[fatmansv8]

Not to slow at all in fact it just confirms it for me thanks man
FatmansV8

[fatmansv8]

Thank you that's very helpful pal. I will indeed give it a bash .
Thanks again
FatmansV8

[fatmansv8]

So normal running temperature is just below 12 o'clock position on the gauge.Did not know that. Mine is always half way between the beginning of the blue and 12 o'clock position . The oil temp is around the quarter mark and only goes up when the temp goes off the scale .
FatmansV8

[fatmansv8]

Thank you Richard . Is there performance issues then when the beast is running cold . I have to say I have noticed a bit of sluggishness especially when the temp goes off the scale . Is the ECU reacting to the information on the gauges .
FatmansV8

[fatmansv8]

Thanks pal . Looks like time to change thermostat and temp switch. Hey still kicked a TT' s ass while not perfoming properly ( he was trying it on ) Thanks
FatmansV8

[fatmansv8]

Ok Richard thank you . Makes a lot of sense I'll get on the case immediately.
Thanks again
FatmansV8

[fatmansv8]

I don't think I will be doing the repair myself I couldn't even diagnose the problem lol . No it's going to a garage for sure . Thanks for the advice though Richard M5.
Thank you
FatmansV8

[fatmansv8]

I will do that definitely.

[fatmansv8]

Bloody hell £384 to get a thermostat and coolant temp sensor fitted. Is that about right or not . It's not a main dealer price either. And and £376 for cam cover gaskets .

[fatmansv8]

I know , have you had it done I haven't the foggiest about how much it should be ?

[fatmansv8]

Nice price man .

[fatmansv8]

Completely understandable .

[fatmansv8]

Yeah sure I can wait I'm parking it up for the winter anyway now . Can't afford to do it yet not at that price anyway .
Thanks man
FatmansV8