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/// The water must go some where quickly. Usually a head gasket has other symptoms, oil in radiator, missing cylinder, but not always. Be sure you do not have water in the transmission if automatic.
Fill the car, crank and run until hot, park over a dry level spot, turn off the engine, leave for fifteen min. to half hour. Go back and look for the wet spot. There are several possible locations for a leak.
The heater lines. They are rubber, at the rear of the engine, after initial leak only steam will exit so there may not be much to see when driving on the highway. A small hole may leak under pressure but be almost invisible after stopping. The metal line from the waterpump is next in that circuit. The heater core would pool water inside on floor.
Depending on your engine there are usually temp sensors on Volvo, any one could leak at the pipe thread or through the sensor.
The water pump has a weep hole on top of the shaft that leaks when the seal fails. It is hidden by the pulleys. Water will drip from the rear of the WP pulley if the engine is off. It will be spun and blown away if runnning. The seal at the block/WP should not just start to leak. The O-ring at the top might, not first choice.
Did you replace hoses, if so check clamps. Check older hoses at the overflow tank, the tank, and the cap.
If you cannot find the leak use a can of block seal and see if that stops it. You can some times drive for years. This is useful if the leak is unusual, (rusted freeze plugs) and you need a few weeks to get around to it.
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