I am having the same issues you posted for your 2003 Nissan 2.5 several years ago. Did you get a gasket replacement or a cylinder head replacement. Did repair last more than 6 months? If so how long. This started when I had to park Altima outside in very cold ( 10 degree) nights and may have played hard on the Aluminum. Details -> Miles 122,000 - 3 of 4 the Coil Packs replaced. In 2015 started to comsume antifreeze. Tests don't report the Head Gasket. Water Noise in the Clove box, engjine cooling system checked and burbed twice. Radiator Pressure tested good with Cylinders passing dry test by two different shops. I don't have PSI number to share. Neither garage tried sell me a head gasket replacement. A 3rd garage reports Engjine 2.5 and Year 2003 has issues when duing a head gasket and or head replacement, and will not perform any more as after doing several the new gasket leaked after 6 months. He performed all key steps and parts for a Head replacment with new chains.
I am new to this site and I am really hoping you can help me with some info. I have been having the same exact problems with my car as you did in this post http://www.supernissans.net/forums/n...ad-gasket.html I was wondering if you ever figured out what the problems was? I dont want to replace the head gasket if it is not necessary. I dont have any of the normal symtoms of a warped or cracked head or faulty gasket except the radiator fluid going low. Anyway I hope u can help me out, thanks very much