Temperate gauge not working and fan running

Ravinder · 17th September 2021, 17:56

Hi

Today, my temperature gauge has stopped working completely so it’s just sitting on the cold position. I also noticed that my fan happens to now be running all the time.

Any idea on what the issue could be?
Car is a MK2 75 1.8 Turbo.

Many thanks.

stevestrat · 17th September 2021, 17:59

Its either the coolant temp sensor or the wiring. If the signal from the sensor is lost it goes to a fail safe mode running the fan constantly.

Ravinder · 14th October 2021, 21:04

New coolant temperature sensor on order.

Ravinder · 26th October 2021, 20:36

Mechanic plugged it onto his machine and it didn’t flag up any fault with coolant temperature sensor. He says it could be thermostat or water pump.
I still think it’s the coolant temperature sensor as per your advise….?

Kearton · 26th October 2021, 20:58

It might be a fault with the fan controller. Mine failed recently. V. expensive (~£450 + VAT), so check the cheaper opions first.

vitesse · 26th October 2021, 20:58

Agree with Stevestrat, but it looks like you want confirmation. So activate the car's own OBD using T- Cut's guide https://www.the75andztclub.co.uk/for...ad.php?t=55585 no reading in section 7 coolant, will confirm the diagnosis.

Regards

17th September 2021, 17:56	#1
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	Temperate gauge not working and fan running Hi Today, my temperature gauge has stopped working completely so it’s just sitting on the cold position. I also noticed that my fan happens to now be running all the time. Any idea on what the issue could be? Car is a MK2 75 1.8 Turbo. Many thanks. __________________ Wanted - Indian bride. Cash waiting. (All sorted - bargain) First name and forum name: Ravinder Rover 75 2.0 CDT Connoisseur SE 116 (160 remap) Royal Blue (JFM) This vehicle was the 50,481st 75 to run off the production line, out of 112,381 This vehicle was the 2,238th 75 CDT Connoisseur SE to be made out of 3,775 This vehicle was the 5,002nd 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s

17th September 2021, 17:59	#2
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,462 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	Its either the coolant temp sensor or the wiring. If the signal from the sensor is lost it goes to a fail safe mode running the fan constantly. __________________ Steve T4 Location Map

14th October 2021, 21:04	#3
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	New coolant temperature sensor on order. __________________ Wanted - Indian bride. Cash waiting. (All sorted - bargain) First name and forum name: Ravinder Rover 75 2.0 CDT Connoisseur SE 116 (160 remap) Royal Blue (JFM) This vehicle was the 50,481st 75 to run off the production line, out of 112,381 This vehicle was the 2,238th 75 CDT Connoisseur SE to be made out of 3,775 This vehicle was the 5,002nd 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s

26th October 2021, 20:36	#4
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	Mechanic plugged it onto his machine and it didn’t flag up any fault with coolant temperature sensor. He says it could be thermostat or water pump. I still think it’s the coolant temperature sensor as per your advise….? __________________ Wanted - Indian bride. Cash waiting. (All sorted - bargain) First name and forum name: Ravinder Rover 75 2.0 CDT Connoisseur SE 116 (160 remap) Royal Blue (JFM) This vehicle was the 50,481st 75 to run off the production line, out of 112,381 This vehicle was the 2,238th 75 CDT Connoisseur SE to be made out of 3,775 This vehicle was the 5,002nd 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s

26th October 2021, 20:58	#5
Kearton Gets stuck in MG ZT-T CDTi Join Date: Jul 2007 Location: Sunny Suffolk Posts: 617 Thanks: 1 Thanked 16 Times in 13 Posts	It might be a fault with the fan controller. Mine failed recently. V. expensive (~£450 + VAT), so check the cheaper opions first.

26th October 2021, 20:58	#6
vitesse I really should get out more....... Rover 75 Saloon Join Date: Jul 2011 Location: Gävle Posts: 2,528 Thanks: 395 Thanked 823 Times in 652 Posts	Agree with Stevestrat, but it looks like you want confirmation. So activate the car's own OBD using T- Cut's guide https://www.the75andztclub.co.uk/for...ad.php?t=55585 no reading in section 7 coolant, will confirm the diagnosis. Regards