Hey all, so I have quite an interesting issue, my 2004 3.9L mustang overheats after heavy acceleration it seems, I let it idle for probably an hour and it never over heats, I drive it under 2500 rpm and it doesn't overheat. Though when I floor it the ac goes hot and the temperature quickly over heats.

I have done a coolant flush about a month or two before after my upper heater core hose burst.
I have also checked the thermostat by putting it in boiling water and it opens.
My fan also turns on so it's not that.
I can really only think of my water pump and a clogged radiator. Any thoughts? thanks in advance.
P.S. I really don't have the money to take it to a mechanic so any advice would help.

 

Also my heat basically blows cold even when its not over heating, don't know if that can be related to the engine over heating.

 

I also remembered that before the engine overheated the transmission started shifting rough and I could smell what I assume to be the transmission over heating. The next day I drove it and it wasn't shifting rough so I floored it and then the engine over heated almost instantly. Ever since then the transmission only shifts rough when the engine starts to over heat...

 

Try bleeding cooling system. Probley air cought in heater core thats why it would blows air when u turn heater on.

 

Thanks for the reply, I have and still nothing, i'm thinking a clogged radiator or a bad water pump. Whats your thoughts?

 

Air bound cooling system. Air prob stuck in heater core. Try bleeding cooling system

 

Or a sticky thermostat.

 

Yup you were right, somehow air was in the system so I just added coolant and bleed it. Thanks for the help!