Temp warning but no overheating

Mossyboy1978 · #1 27th June 2022, 07:05 AM

Morning all

I keep getting regular temperature warning - the big red thermometer in the centre of the dashboard! - but the car is ALWAYS rock solid at 90 degrees. It's been happening for a about a fortnight and I've driven to good wood and back with the warning light flashing but the car was beautiful and never skipped a beat.

Could it be the sensor in the coolant tank?

The coolant level is fine.

Thanks

Mossy

ainarssems · #2 27th June 2022, 09:42 AM

Yes, that warning is for coolant level not for temperature

Mossyboy1978 · #3 15th September 2023, 07:13 AM

Bumping this up again as I'm get fed up with the warning and cannot find a new tank with a fresh sensor in it anywhere. There is defo not a coolant leak or issue.

If I just disconnect the sensor will that stop the warning or make it keep going as it cannot sense any coolant at all?

The beeping and icon are doing my head in...

MikkiJayne · #4 15th September 2023, 08:16 AM

The V6 part is basically the same as the V8 one but with an extra bracket that has no effect on anything.

https://www.autodoc.co.uk/car-parts/...N%204D0121403C

https://www.ebay.co.uk/sch/i.html?_f...c&LH_PrefLoc=1

Mossyboy1978 · #5 15th September 2023, 08:23 AM

Brilliant! Thank you.

And disconnecting the sensor wont make any difference?

MikkiJayne · #6 15th September 2023, 08:56 AM

Disconnecting the sensor is the same as low coolant. You could try shorting the pins on the connector to shut it up while you order a replacement.

Mossyboy1978 · #7 26th September 2023, 02:45 PM

So now I am really confused.

Autodoc sent me two new coolant reservoirs by accident instead of one. Hooray!

Installed first one and the same warning comes on about 10 seconds after ignition. Considered it could be a dodgy sensor in the tank and so installed second one. SAME THING happens!

Checked sensor plug wiring and all connected up properly inside the connector. No rust etc. All tidy.

Checked sensor plugged into connector the correct way and it is.

What on earth could be causing this to keep flagging an alert if it isnt the connector or the sensor in the tank??

Ronin · #8 26th September 2023, 06:31 PM

Did you test the sensor wiring?

Mossyboy1978 · #9 28th September 2023, 07:55 AM

I haven't actually. I need to get a voltmeter and see if there is current.

Question is - if there isn't, where does that wiring go back to that might need to be checked? Fusebox? ECU?

steamship · #10 28th September 2023, 12:39 PM

Quote:

Originally Posted by MikkiJayne

You could try shorting the pins on the connector to shut it up while you order a replacement.

Quote:

Originally Posted by Mossyboy1978

I haven't actually. I need to get a voltmeter and see if there is current.

Question is - if there isn't, where does that wiring go back to that might need to be checked? Fusebox? ECU?

Have you tried MJs suggestion of shorting the pins on the connector? i.e. short pins + warning disappears = wiring okay