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HI, we have 2002 Nissan Primera that is losing water but not onto the ground beneath the car. There isn't any oil in the water or vice versa, but we can't see where the water goes? Any ideas

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Check the water level in the bottle. If the radiator cap is faulty it will allow excess hot water into the bottle but on cooling down the water is supposed to be sucked back into the radiator. It gets to a point where low water in the radiator will not be pushed out and you get the impresion that you are loosing water If this area checks out the only other place is through the combustion chamber as steam indicating a head gasket or cracked head./ Check the radiator cap first and while you are at it with the engine hot fill the radiator right up and run the engine at idle. If you see air bubbles blowing out the water intermittently put your money on that is where the trouble is. hrad gasket or cracked head

Posted on Jan 17, 2013

  • Matatarian Jan 20, 2013

    Thanks, have new radiator cap. The previous owner had it pressure tested and the shop determined not the head gasket. We don't lose any power at all and she drives fine apart from the over revving in idle. I'll post a new question about that.


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I would get your system pressure tested. I am thinking that your radiator cap is leaking (system not holding pressure) so you would then lose water after the engine warms up. A pressure test will tell you if there are any other leaks in your system if that is all good then it is probably the cap.

Posted on Jan 17, 2013

  • Matatarian Jan 20, 2013

    Thanks, Previous owner had it pressure tested and head was apparently fine? We don't lose any power but engine is over revving especially in idle. Will try the radiator cap and post another question about the over revving, thanks.



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