low coolant light

ok so drained the water that was in my radiator last night and refilled it with coolant. i started it and let it run for a bit then put more coolant in after it had sucked some out of the resevoir. i know its full cause i tooka bout a gallon and a half of fluid. but this morning when i started the car the low coolant light came on. so i checked teh resevoir thinking maybe i didnt put the plug back on it right but the resevoir was full. and the plug for the radiator wasnt leaking. what is causing this? cause i know that thing is full, i drove it to school and back and it never overheated. so i'm thinking my car is just retarded.

p.s. its done this once before and i had to pay somebody to fix it. they said it was a bad sensor or something. i dont remember exactly what it was. it was like 2 years ago.

ok so drained the water that was in my radiator last night and refilled it with coolant. i started it and let it run for a bit then put more coolant in after it had sucked some out of the resevoir. i know its full cause i tooka bout a gallon and a half of fluid. but this morning when i started the car the low coolant light came on. so i checked teh resevoir thinking maybe i didnt put the plug back on it right but the resevoir was full. and the plug for the radiator wasnt leaking. what is causing this? cause i know that thing is full, i drove it to school and back and it never overheated. so i'm thinking my car is just retarded.

p.s. its done this once before and i had to pay somebody to fix it. they said it was a bad sensor or something. i dont remember exactly what it was. it was like 2 years ago.

You've got air in the system. You have to bleed it out.

graymarki

so how do i go about doing that? i can only find one bleeder valve. and tahts the one one on top. infront fo the engine

ok nvm, it fixed it self haha. i guess it pushed the air out.