magdalenascholz1
S90 Low Coolant Warning
Summary of the thread
A 2016 Volvo S90 hybrid displayed a 'check engine' light due to low coolant levels, despite no visible leaks. The coolant was topped up, but the concern remained similar to a tire losing air. Potential causes include air pockets in the cooling system, though the engine temperature remained normal. A visit to a garage confirmed the issue was simply low coolant, which was resolved by topping it up, alleviating the warning light.
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4 comment(s)
magdalenascholz1 (community.author)
Thanks. No, the temperature gauge seems normal. Where exactly would air pockets form? Is there a specific spot I should be checking or a bleeding procedure?
larawerner1
Understood. If the temperature gauge reads normal, that somewhat mitigates the urgency. Air pockets can form in various places within the cooling system, such as the water pump area or near the thermostat housing. Given that the issue has been observed, I would suggest a visit to your local workshop to properly diagnose the problem.
magdalenascholz1 (community.author)
Cheers. Topped up the coolant again to the min/max mark, and everything seems fine again. Went to the garage and got it checked, it was just the coolant level too low, they charged me 52€ to top it up and now everything is fine again!
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VOLVO
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S90
larawerner1
A low coolant level on your Volvo S90 hybrid, accompanied by a check engine light, does indeed warrant further investigation. Has the engine temperature been running higher than normal at any point? It is possible there might be air pockets.