My Toyota noah engine overheat and engine just cut out and the car will not start now. Had check head gasket and check oil dipstick for oil and water mix but it's fine. Did replace the thermostat, waterpump and plugs but still the same. When I turn key the fan starts running. What else can I check to find this problem ?

SOURCE: water in oil

I have yet to see a cracked head on a 22R,so more than likely a blown head gasket,unless you overheated and warped the head and worst case a hole between the cylinder wall and water jacket(this is pretty rare).The only way to tell short of using some expensive tools or taking to your local shop is to pull the head and inspect the gasket for leakage wich is generally fairly obvious(separation of the gasket layers,oil and water between water and oil passages)and checking the head deck for warpage.If there is obvious leakage in the gasket you're looking at a top end gasket set if the head is slightly warped you can get away with a thick graphite head gasket,I personally use these as they are very forgiving on slightly warped and scratched head decks and inepensive also,but a severly warped head will require milling at a machine shop or replacement.

SOURCE: nissan sentra n16 temp. overheating

If all of the things you replaced are working fine I am going to say double check the thermostat. Also make sure your fan is engaging at temp. You cam check by running till warm and then running the AC. If the car does not overheat with the AC on then your fan is not running under normal conditions (with AC off) This can be caused by a couple of different things depending on how the fan is set up. I am not a nissan expert

SOURCE: 97 chrysler lhs overheats

Head gaskets don't cause overheating Usually they are a result of overheating. If the headgasket is bad one wil get leaking into the cylinders of coolant,which wil show up as milky oil.Like some one else stated ; have the radiator rodded out,(cleaned and fluashed).

SOURCE: 98 Catera goes into "Limp Mode" after warm up.

have you check you ignition coil packs.

SOURCE: Head gasket is damaged. 2005 Nissan Sentra, 1.8

i have a 2005 1.8 nissan sentra.i rplaced the radiator becuause it was leaking.so when i did i took it for a test drive and the needle went to hot then back down to middle ways between the C & H BACK IN FORTH.so i replaced the thermostat. now as far as i can tell it is staying in the middle of C & H. i can't feel no water though cerulating through the top or bottom hose of the radiator. so now that i told you what i done so far my question is???? ( my heater is not working in the car it is blowing out cold air & i left the car runnng for about 45 min. even took it up and down the road.still cold air.what do you think i need to do?????????? )