I have 2011 automatic Nissan Sunny. It recently started heating up when the Air-conditioning is on and when I'm at a stoplight but at normal speeds it's fine and even without the AC on, be it idling. My mechanic told me to change the radiator and the thermostat then the water pump but nothing changed. Then yesterday I tried to diagnose it myself my researching on YouTube and when I went under the hood I saw the AC fan was weak and shaky, I changed that today plus some hardened water pipes due to chronic overheating but still nothing. Then finally an electrician checked the fuse box and saw that the relay for Fan 2 (for AC) was missing current at times (the car has 2 fans), it was changed once before. After changing the relay the fan started spinning with much more power and the car stopped overhearing like it used to. But now there is a weird thing, sometimes when I'm turning right or taking a U-turn, the heat gauge hits H! And when I turn the car back on a straight road it goes back to normal. I've also been told that it might have a head gasket leak but I don't see any signs of that yet. Please HELP!

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No. 1-3
Timmi
Timmi

My bad! I just confirmed water pump hasn't been replaced. Today when I got it opened, that was the issue. It was destroyed!

Timmi
Timmi

Today I was on my way back home. Both fans were working, car temp was half and outside temp was around 37c. Something exploded and water started gushing from under the hood. When I checked, the pipe coming back to the radiator had popped out, somehow I managed to put it back, the expansion tank was full. But the temperature kept rising till H, then I parked the car somewhere and came back. There was no apparent leakage from the radiator. What should I do? 😓

ScottyKilmer
ScottyKilmer

Editor

change the fan motors first, they are probably shorting out

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