melinablitz3

C70 Coolant Loss Check Engine Light

I've got a 2006 Volvo C70, diesel engine, with about 240k on the clock. Recently, the check engine light popped on, and I pulled the codes – showing a low coolant level. I've checked, and yeah, it's definitely low. Anyone else seen this? Where's all my coolant going? Is this a water pump issue, or could it be something worse, like the head gasket? I'm not seeing any obvious leaks.

A 2006 Volvo C70 owner experienced a check engine light due to low coolant levels, with no visible leaks. Possible causes discussed included a cracked coolant reservoir or a failing water pump. A suggestion was made to inspect the reservoir for hairline cracks and consider a pressure test to rule out head gasket issues. The issue was resolved by replacing the cracked coolant reservoir, clearing the codes, and restoring normal function.

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4 comment(s)

I had a similar issue with my C70 (although mine's a petrol). Coolant disappearing, engine light on... Sound familiar? Have you checked your coolant reservoir for any hairline cracks? They can be tricky to spot, but can cause a slow leak, especially when the engine heats up. Is your engine overheating?

Thanks for the tip! I'll definitely give the reservoir a closer look. Overheating? Not that I've noticed. The temp gauge seems normal. Would a cracked reservoir really cause the 'check engine' light to come on? Seems a bit extreme for just a bit of lost coolant, doesn't it?

Yes, the check engine light is often triggered by low coolant level because the engine management system detects a potential overheating risk, even if the temperature gauge doesn't show it yet. While a cracked reservoir is a possibility, with that kind of mileage, also consider the water pump. It might be weeping slightly. If you can't find anything obvious, it might be worth getting it pressure tested at a workshop to rule out head gasket issues too.

Thanks again for the advice! I took it to a local shop, and you were right on the money – hairline crack in the coolant reservoir. Replaced it for 52€, codes cleared, and all seems good so far. Much appreciated!

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VOLVO

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C70