Here's the deal, my B18C turbo upper radiator hose busted on me while driving on the highway and the car overheated. After replacing the hose, the car temp gauge goes up and will overheat while driving. As soon as I stop moving(idle), the temp slowly drops back down.
Even under no boost, the car will overheat. I have to let the car sit idle for the temp to drop back down.
What could be some causes to this?

Thanks

 

Air in the cooling system.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by psi420 &raquo;</TD></TR><TR><TD CLASS="quote">Air in the cooling system.</TD></TR></TABLE>

Agreed

 

How should you bleed the air out or see if there is air in the coolant?
Do you remove the radiator cap while idle and let the air bubbles escape through
there?

 

Cold Engine - Remove Cap
Fill radiator to top
Leave cap off, turn engine on.
Turn heater on full blast.
Watch the radiator level and keep it topped off.
When engine and heater is hot, the radiator level will start to rise and flow over, cap it off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by psi420 &raquo;</TD></TR><TR><TD CLASS="quote">Cold Engine - Remove Cap
Fill radiator to top
Leave cap off, turn engine on.
Turn heater on full blast.
Watch the radiator level and keep it topped off.
When engine and heater is hot, the radiator level will start to rise and flow over, cap it off.</TD></TR></TABLE>


it could also be caused from a blown gasket, too.

 

this may sound dumb, but is the fan spinning in the correct direction?