Checked the dipstick and it looks like there is water in the oil. Could this be a head gasket problem or water pump problem? what is typical for this year car and engine only has 150,000 miles and maintenance done on a regular basis.
If there is water in the oil, it wouldn't last long under the heat/pressure of the engine, so if you are seeing water it must be super fresh. Are you losing coolant? If so, then i'd suspect water pump/water pump gasket if you never had that replaced. It could be head gasket, but you would probably experience a consistent coolant loss with maybe loss of power or misfiring. You can check with a pressure/leak down test for head gasket. Either way, if you are losing coolant I'd check water pump. If you aren't losing coolant than it can't be the water pump or head gasket really letting "water" in.
The most direct path between the 2 is a head gasket leak. Try a radiator leak-down test.
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SOURCE: 96 nissan maxima overheating
Check or have the electric cooling fan or fans checked, to see if they are coming on, and the radiator cap checked. You've done everything else.
SOURCE: 2000 NISSAN MAXIMA TRANSMISSION SLIPPING
If you havent already try to change the transmission filter.Sometimes when the filter gets dirty fluid pressure is comprimised and certain pumps and solenoids which control shifting inside the transmission function off of the fluid pressure,
SOURCE: timing chain replacement on 96 niss maxima
Balance the tensioner and that should get rid of the rattle.
SOURCE: rear main seal
I have done many the transmisson has to come out to replace it but your price is way out of line, should not be more than $400.00 give me a zip and I can get you a certified shop that can do it for less with a warrenty.
SOURCE: 97 Nissan Maxima. Where do I fill Transmission Fluid?
The dipstick is where you fill it =) (lol) use a funnel too, otherwise you will stain your garage floor.
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