I'm speaking in generality now, but I've found that in cooling system changes to inadequacy over time that if the temp is too high on the road with unhindered air flow and no thermostat we can't blame the fan/shroud.I would look closely at core cleanliness both inside and out.I have seen some overheating caused by restricted air passages that were not easily detected by eye.
Also seen pump impellers loose or eroded that would decrease cooling ability.
One more comment on fan problems --have seen them reversed,which will make the fan very inefficient and usually noisy.The fan should have the concave side of the blade toward the engine for a normal "sucker" fan rotating same direction as the crank pulley.
Last edited by enginenut; 07/12/2011 5:20 PM.
