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So last night I was driving the car for 15 miles with 80mph on 3000rpm then when i got to the parking lot, i noticed that the temp is going up, and I was like dont worry its gonna stay there then after couple seconds it kept going up and higher, but I didn't let it reach the max so i parked next to the street turned the car off and opened the hood. But No leak from the radiator or anything. So i drove home and nothing happened.
When i got home i turned the car on and kept the rpm from 2000-3000rpm then the cars temp started going up again, but steal no leaks.
Do you guys know what is causing this?

 
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when it is cold open the rad cap and see if theres coolant,sounds like a head gasket leak,possible a air lock in the coolant tube.fill rad back up,if its low,start car wath for air bubbles in rad opening.head gasket usally if you see some.

 
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So I just gave it to the mechanic yesterday. But we he told me its the fan relay but idk lets see if it will work now.

 
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check water pump leak

 
Rep Power: 168

I'm having a similar problem with my car. When your engine is hot, feel the lower radiator hose that runs to the side of your engine and compare its temp to the upper hose. If it feels significantly cooler, your thermostat is faulty and needs to be replaced. It's a $14 part + $4 for a gasket if you even need it. And you only have to remove two 10mm bolts to get to it.

Your fan will not cool your engine at 80 mph anyway, so the relay being bad is not whats causing the overheating.