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Q: Where can I find a diagram showing the coolant lines on the back of the engine? on 1999 Volvo V70 XC

Soon as I poor water in to the overflow canister it runs out at the back of the engine near the firewall.
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You have two hoses that attach to the firewall, these go to your heater, and it's likely where the leak is coming from. Best to have a VOlov tech address these, the hoses and especially the connectors are real finicky and if not replaced properly, will continue to leak.
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