too much coolant going into the reservoir

[Ashvin]

I have 00 Maxima with 212,000 miles. For about the last 15,000 miles the coolant leaks from the radiator into the reservoir almost filling it to the top. I can see gas bubbles going into the reservoir. Some of it then goes back into the radiator but there is still too much in the reservoir. After it cools, I pick up the reservoir box and let the coolant go back into the radiator, but he same thing happens again the next time I drive. The heater also blows cold air when ideling. The radiator and the cap where replaced about a year ago. Other than this problem the car runs perfect. Does not over heat, make any weird sounds, and there is no smells or smoke coming out of the exhaust. What could be causing this? Could it be the water pump, or is it the head gasket?

Modified by Ashvin at 2:15 PM 1/9/2009
Modified by Ashvin at 8:55 PM 1/9/2009

[carstud]

Hello sorry to say it most likely is the headgaskets leaking a small amount of combustion gas into the cooling system. Have FX 35 in our shop with the same issue, found both metal headgaskets are worn and leaking. Both the heads and the block were not out of spec for warpage all were less than .004 spec. With that mileage I would check http://www.car-parts.com for a used engine.

[NutriaforBreakfast]

Check oil. If it is discolored, maybe like a carmel colored milk shakeI would not drive or u might blow it up until u fix the head gasket, I think

If so you could get the head rebuilt maybe if its not warped.

By the way, just helped rebuild a Ford SOHC engine so a DOHC would bevery scary for me to work on.