My car has been over heating lately

I recently changed out the radiator&
thermostat
and I heard to bleed the valve on the coolant line I did that and it helped and then it started to over heat again

How can I tell if the head gasket has blown?

 

When my head gasket was blown on my old car a lot of smoke was coming out and its blueish colour, that's one way to tell but im not sure about with this car but im sure their all the same.

 

you probably didnt get all the air out of the lines do the procedure again and make sure the overflow tank doesnt get empty you'll need two people actually 3 for the job one person bleeding, pouring and one with foot on high rpms

 

^^^yrah you guys have a point it doesn't smoke at all!
so I may have to re do that prcedure again ill keep you guys updated
thanks

 

Ok so while I drive it home it goes upp above half way on the temp reading and at stops it goes down any thots?

 

what kind of mixture do you have in there 50/50 or just pure coolant. And remember to use just distilled water not regular water out of the sink

 

Ive only been using 5050 so far..idk what else to do?can it be water pump?

 

I would also check your transmission fluid, to see if there is any mixture of coolant or the level is higher than the normal. Do you usually add coolant to your car on occasions?

 

yeah ill check that tranny fluid today when i get off from school and work

and no i dont i just usually make sure the over flow has enuff fluid

 

Make sure the cars running when you're bleeding it.

 

Store bought 50/50 mixture is good down to +/- negative 30 degrees. If the outside temp never gets below 10 degrees, you don't need a -30 mixture. I usually open a gallon jug of antifreeze and pour in distilled water until it's completely full (that should raise the temp by 20 degrees).

Check the radiator cap. If your coolant overflow tank is full when you cut the car off, then drops down after it cools off, then your cap is fine. If not (radiator hoses may have colapsed as well), your cap is probably bad.

Now do your bleed by unscrewing the fitting on the coolant pipe under where your harness comes into the engine compartment. (park your car on a slight incline, front up) Fill up your radiator until fluid comes out of the fitting. Screw the plug back in and top off your radiator and fill your overflow to the indicated line.

If your car overheats after these procedures, take it to a reputable Nissan tech for further inspection.

 

BTW, don't do this ^ !!!

 

Got the same problem, but my coupe only heats up when it is at idle for a 10+ minutes.

Anyone have any suggestions on what it could be?