Hey guys I have a 06 tsx , I experienced some overheating about a month ago. I've tried several fixes but none seems to be working.
I've replaced the thermostat
flushed the heater core
Replaced radiator cap and hose clamps
It still seems to be building up pressure in the system. I've checked plugs when replacing for signs of a gasket blown(no indication). Both fans activate when the a/c is on. Any help will be greatly appreciated. It seems to be losing coolant somewhere because it always takes a small amount of coolant(maybe 12oz every 3 or 4days)

 

I am sorry to hear, but it sounds like you have a blown head gasket. The coolant is likely being burned in your combustion chamber. Did your cylinders look super clean when you checked the spark plugs? If it does, then it sounds like it was steam cleaned with the coolant. There is a kit of some sort that you can use to test if your coolant has carbon dioxide. Also excessive smoke in your tail pipe would also indicate the coolant is being burned.

When did you first experience the over heating? Was it only at idle? Does your radiator fans ever come on when your at idle?

 

Pressure test it and go from there.