Symptoms indicates inefficient cooling when AC is turned ON.
Draining does not flush the radiator if it is clogged.
When problem occurs, feel the heat difference between the upper and lower hose, if they are similar, I would suggest rechecking the radiator, it could be partially clogged internally.
If the lower hose is much cooler than the upper hose, you could have a fault with the thermostat, it is not opening sufficiently
Tuesday, September 15th, 2009 AT 1:46 PM