I have a 91 honda civic lx and i cant figure out why it is overheating. So far i have replaced the thermastat and flushed the system with a flushing system. Right now it overheats when i am moving at any speed other than idle. The upper radiator hose is hot and the lower hose is cold. What is wrong with my car?

 

headgasket.

 

possibly a blockage as well.

 

if it is the headgasket, you will be losing coolant and the motor will be smoking some white smoke.

 

yeah. the cold hose/hot hose makes me think some sort of a blockage as well.

 

when i flushed it out it didnt seem to have any blockage. I thought it might be the headgasket, that is the next thing i am going to replace.

 

my motor didnt smoke until the headgasket completely went. before that, it was still overheating. replaced the thermostat twice and it still overheated.


all im saying is dont rule it out.

 

well i will just take the radiator and all the hoses out and check to make sure nothing is being blocked.

 

also when it is over heating and i put the heater on full blast it is blowing out cold air.

 

cold air on a hot day?

i mean...anything besides a/c should be blowing Hot Air into the system.

it could be an electrical problem.