C70: - Engine coolant temperature

C70 owner · Jan 30th, 2020, 22:45

My temperature gauge has stopped working on my 2004 c70 T5, and my climate control led flash red when I start the car. My code reader tells me the engine coolant temperature signal is missing, I’ve changed the stat and housing, tried a different set of clocks, but no joy. Any advice would be very much appreciated.

Cookeh · Jan 30th, 2020, 23:32

Thermostat doesn't give temperature data to ECU. The coolant temperature sensor does. Test that part, the connector and its wiring, change if required.

C70 owner · Jan 30th, 2020, 23:48

Is that not the sensor on the stat housing? Is there another sender that I’ve missed as that could very well be my problem, lol.

Cookeh · Jan 31st, 2020, 00:12

There's a sender beneath the upper rad hose on the housing, not sure if that's the one you mean.

C70 owner · Feb 1st, 2020, 10:01

Yea, changed that with the stat housing for a new one, wiring looks good as does the plug, any other ideas? Can’t seem to find a Volvo friendly auto electrician in Kent anywhere!

Turboted928 · Sep 6th, 2020, 20:52

Did you have any luck finding the cause of your missing temperature reading?

Jan 30th, 2020, 22:45	#1
C70 owner New Member Last Online: Jun 8th, 2021 19:29 Join Date: Jan 2020 Location: Kent	Engine coolant temperature My temperature gauge has stopped working on my 2004 c70 T5, and my climate control led flash red when I start the car. My code reader tells me the engine coolant temperature signal is missing, I’ve changed the stat and housing, tried a different set of clocks, but no joy. Any advice would be very much appreciated.

Jan 30th, 2020, 23:32	#2
Cookeh Premier Member Last Online: Sep 14th, 2022 17:04 Join Date: Jan 2018 Location: Derbyshire	Thermostat doesn't give temperature data to ECU. The coolant temperature sensor does. Test that part, the connector and its wiring, change if required. __________________ 1995 Volvo 850 T5 Estate (Manual)

Jan 31st, 2020, 00:12	#4
Cookeh Premier Member Last Online: Sep 14th, 2022 17:04 Join Date: Jan 2018 Location: Derbyshire	There's a sender beneath the upper rad hose on the housing, not sure if that's the one you mean. __________________ 1995 Volvo 850 T5 Estate (Manual)

Jan 30th, 2020, 23:48	#3
C70 owner New Member Last Online: Jun 8th, 2021 19:29 Join Date: Jan 2020 Location: Kent	Is that not the sensor on the stat housing? Is there another sender that I’ve missed as that could very well be my problem, lol.

Feb 1st, 2020, 10:01	#5
C70 owner New Member Last Online: Jun 8th, 2021 19:29 Join Date: Jan 2020 Location: Kent	Yea, changed that with the stat housing for a new one, wiring looks good as does the plug, any other ideas? Can’t seem to find a Volvo friendly auto electrician in Kent anywhere!

Sep 6th, 2020, 20:52	#6
Turboted928 New Member Last Online: Feb 21st, 2021 16:20 Join Date: Jul 2020 Location: Oxford	Did you have any luck finding the cause of your missing temperature reading?

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