I would test the fan clutch first. When the vehicle is warm, shut it off and test the resistance to turning the fan. It should have considerable resistance with it warm. Another test is, If the clutch fan is the coiled bi-metal spring type, it may be tested while the vehicle is being driven. To check, disconnect the bi-metal spring, and rotate the spring 90 counterclockwise. This disables the temperature controlled free wheeling feature and the clutch performs like a conventional fan. If this cures the overheating condition, replace the fan clutch.
Another thing that can help is to check the compression on each cylinder. If the engine overheated too much it could have warped the heads and caused the head gasket to leak. Cracked heads is another posibility.
Friday, August 11th, 2006 AT 3:54 PM