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S80 coolant overflow tank 2nd hose??

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.
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S80 coolant overflow tank 2nd hose??

Post by 850TurboTurtle » Fri May 22, 2020 8:17 pm

What is the second hose connected to the S80 coolant overflow tank top? It goes down and into the engine cover. I bought a replacement coolant tank and it only has one hose nipple on top/ I'll be ordering the right part, but I'm curious where that other hose goes.

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Re: S80 coolant overflow tank 2nd hose??

Post by June » Fri May 22, 2020 9:08 pm

To the thermostat housing. June
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Re: S80 coolant overflow tank 2nd hose??

Post by oragex » Tue May 26, 2020 12:24 pm

On my non turbo it's simply an overflow hose from the radiator. Worth checking the clamp is tight, so it does not loose pressure - the tank is pressurized. If you notice white deposits around this hose, it may not be tight enough
Last edited by oragex on Wed May 27, 2020 5:46 am, edited 2 times in total.

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Re: S80 coolant overflow tank 2nd hose??

Post by ndphotonl » Wed May 27, 2020 1:58 am

Yep, same here on my 2.4T. It goes to the top of the radiator.
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