Engine: 2.5: - very hot engine

jack taylor · Oct 28th, 2018, 08:37

Hi, I have a 1998 V70, 2.5 auto.Having driven 40 odd miles this morning I noticed the water temperature gauge was still on cold. Upon stopping the engine the fan was going full blast and the engine was very hot. There are no water leaks and the water level is fine. I would very much appreciate opinions please. thanks jack

Luxobarge · Oct 28th, 2018, 08:49

Were the coolant pipes to and from the radiator hot too? If so, it simply sounds like a temperature sender fault to me, but if not then a stuck thermostat - although I can't see how a thermostat stuck shut would cause the temperature guage to show cold???

Clan · Oct 28th, 2018, 09:26

Quote:

Originally Posted by jack taylor

Hi, I have a 1998 V70, 2.5 auto.Having driven 40 odd miles this morning I noticed the water temperature gauge was still on cold. Upon stopping the engine the fan was going full blast and the engine was very hot. There are no water leaks and the water level is fine. I would very much appreciate opinions please. thanks jack

The temperature sensor or wiring to it broken , the ECU cannot get a valid reading so switches the fans on for safety ..

volvo again · Oct 28th, 2018, 10:13

I would start by removing and testing the thermostat and temp. sensor, or even just replacing them, not expensive, check wiring to sensor while you're at it...

jack taylor · Oct 28th, 2018, 14:35

Hi guys, many thanks for your help. Would a faulty temp sensor or broken wire cause the temp gauge to remain on cold all the time. thanks jack.

Clan · Oct 28th, 2018, 14:37

Quote:

Originally Posted by jack taylor

Hi guys, many thanks for your help. Would a faulty temp sensor or broken wire cause the temp gauge to remain on cold all the time. thanks jack.

yes it would

jack taylor · Oct 28th, 2018, 14:56

Hi Clan, Thanks for that. Forgive this question but which would likely be the cause. thanks jack

Clan · Oct 28th, 2018, 15:32

Quote:

Originally Posted by jack taylor

Hi Clan, Thanks for that. Forgive this question but which would likely be the cause. thanks jack

rotted wire probably near the sender as it gets very hot there , Or the sender itself , although I have never seen a sender fail that way before , So have a look at the wire coming from the sender , there is a plug there too and see if the wire is flimsy or broken .

jack taylor · Oct 28th, 2018, 15:42

Thanks Clan that's very helpful. jack

Oct 28th, 2018, 08:37	#1
jack taylor Master Member Last Online: May 15th, 2022 15:53 Join Date: Jan 2008 Location: Torrenueva, Costa del Sol	very hot engine Hi, I have a 1998 V70, 2.5 auto.Having driven 40 odd miles this morning I noticed the water temperature gauge was still on cold. Upon stopping the engine the fan was going full blast and the engine was very hot. There are no water leaks and the water level is fine. I would very much appreciate opinions please. thanks jack

Oct 28th, 2018, 08:49	#2
Luxobarge Premier Member Last Online: Today 14:11 Join Date: Jan 2011 Location: Horne (Nr. Horley)	Were the coolant pipes to and from the radiator hot too? If so, it simply sounds like a temperature sender fault to me, but if not then a stuck thermostat - although I can't see how a thermostat stuck shut would cause the temperature guage to show cold??? __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Oct 28th, 2018, 10:13	#4
volvo again Master Member Last Online: Today 11:03 Join Date: Jun 2018 Location: Presteigne, mid Wales	I would start by removing and testing the thermostat and temp. sensor, or even just replacing them, not expensive, check wiring to sensor while you're at it...

Oct 28th, 2018, 14:35	#5
jack taylor Master Member Last Online: May 15th, 2022 15:53 Join Date: Jan 2008 Location: Torrenueva, Costa del Sol	Hi guys, many thanks for your help. Would a faulty temp sensor or broken wire cause the temp gauge to remain on cold all the time. thanks jack.

Oct 28th, 2018, 14:56	#7
jack taylor Master Member Last Online: May 15th, 2022 15:53 Join Date: Jan 2008 Location: Torrenueva, Costa del Sol	Hi Clan, Thanks for that. Forgive this question but which would likely be the cause. thanks jack

Oct 28th, 2018, 15:42	#9
jack taylor Master Member Last Online: May 15th, 2022 15:53 Join Date: Jan 2008 Location: Torrenueva, Costa del Sol	Thanks Clan that's very helpful. jack

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