Re: i did a coolant flush and bleed the system and it...
On the top of the radiatorr there is a plastic screw that has a head similar to a Phillips screw, this needs to be removed to bleed the air out of the system and prevent air pockets. Take both the screw and the radiator cap off when filling the system and add your coolant to both holes. Let the car idle while filling with the heater on so the whole system is circulating and watch for the bubbles to come out. Fill the radiator right to the top, replace the two caps and you should be OK.
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suspect a blown hose, heater hose probably behind the engine. now when you fill it back up you have to bleed the air out of the system and the bleeder valve is usually a brass screw close to the area of the thermostat... find the leak first and foremost or catastrophic engine damage can and will occur
Are your cooling fans working?Could be your thermostat,to check put in pot of hot water at 190 degrees and see if it opens,then remove to see if closes,if it does this,then it's good,another thing is the coolant may need bleeding,air inside system or bad water pump,not circulating,bad bearing.
did you allow the thermostat to open up and let coolant flow through getting rid of air pockets.. if it didnt overheat before you have an air pocket in the system... take the radiator cap off, make sure its toped off on coolant, turn you heater on full blast, all the way over to hot, and on the defrost setting, this will allow all of the air to bleed from the heater core, you will probably notice the vehicle pushing some coolant back out, thats the air coming out of the system.. keep an eye on the temp gauge while your doing this.. after the coolant cycles through a couple of times, and the vehicle is blowing heat, top the radiator off with coolant, put the cap back on... drive it and see if it still overheats.. most likely will not... getting the air out of the newer vehicle coolant systems can be a time consuming...pain it the ****.. hope this helps, if you need any more assistance feel free to email me and i would be more than happy to help any way i can.. email@example.com
you have air trapped in the cooling system, do the following procedure to purge the air out. The generic method of bleeding air from the cooling system is to use a floor jack and raise the front of the car as high as poss, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled into the cooling systeml , if it still overheats then you need to have the head gaskets checked with a gas analyzer for hydrocarbons present in the radiator or recovery tank
When the engine is cold,and the radiator is full,starting the engine,does it blow out the radiator?If it does,then a head,or head gasket is blown.If not,bleed the system of air.The engine cooling system might have air that needs to be purged out.
flushing the radiator might not be enough to remove the water scales inside the small cavities...have it opened and cleaned thoroughly. In the location where I live they remove the top and the bottom part of the radiator and put a flat wire in and out into each of the flat tubes to dislodge the accumulated scales and dirt out. hope this helps
If you did not have this problem before the coolant was flushed and replaced, then you most likely have a air pocket in the coolant system causing the over heat or running hot condition. Nissan's can get air pockets very easy if not bleed correctly causing over heating.