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04 S80 Coolant Light Staying On

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
Kjmike95
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04 S80 Coolant Light Staying On

Post by Kjmike95 » Tue May 21, 2019 1:42 pm

On my 04 S80 T6, my low coolant light stays on. I would worry about it more, however, my engine temp is completely fine.I'll fill up the coolant tank and the light will stay on. What is worrying though is after a couple months, it looks like my tank is empty. I've checked the oil and there's no sign of coolant in my oil and it isn't leaking on the ground. What else might be worth mentioning is the heat doesn't work.

This is my first post, so this may be a common issue, but after looking around, I haven't found it.



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RickHaleParker
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Re: 04 S80 Coolant Light Staying On

Post by RickHaleParker » Tue May 21, 2019 2:07 pm

There is a switch on the coolant reservoir tank that controls the low coolant light. Check that switch it's wiring and connector. Also check the float in the coolant reservoir tank, make sure it not stuck.

No heat could be a lot of things. You will need to get more information.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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June
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Re: 04 S80 Coolant Light Staying On

Post by June » Tue May 21, 2019 2:11 pm

The light is likely the sensor in the coolant tank. Obviously you have a leak. Check the water pump, and all the hoses. Just this year I had one of the hoses to the oil cooler on the oil pan started leaking. Here I thought all the hoses were replaced and bam a coolant leak at the back of the oil pan... so if you have not replaced all the hoses you are passed due! June


My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

Kjmike95
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Re: 04 S80 Coolant Light Staying On

Post by Kjmike95 » Wed May 22, 2019 6:24 pm

I just filled up the tank to half way. I did check the connecter, wires, as well as the float. I couldn't find the switch. Maybe I can be informed of what that is. I haven't checked the hoses for a leak yet, however the car has sat in the same spot for a couple weeks and there wasn't any signs of leaks.

Since the days have been 80°+ everyday, heat isn't a problem. Just thought it may be a symptom of something else related to the coolant low light.



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RickHaleParker
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Re: 04 S80 Coolant Light Staying On

Post by RickHaleParker » Wed May 22, 2019 6:44 pm

Kjmike95 wrote:
Wed May 22, 2019 6:24 pm
I couldn't find the switch. Maybe I can be informed of what that is.
This is on a V70 but the S80 is the same. A new sensor is about $28.00.

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June


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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