Corral Elite Member
Join Date: Nov 2007
Location: Custer, South Dakota
I just skimmed through all of this and I feel that a part could be missing.
On the 5.0 Foxbodies, there is a "Air Deflector" located under the Core Support. Without it, a Fox will tend to overheat, yes, even at speed. It is made of Black Plastic and kinda resembles a piece of angle iron going side to side.
Also, I saw some posts that complained about "Mis-Reading Gauges". This is most likely due to a faulty ground of the Dash Wiring Harness near the Battery. This Ground goes to the Dash Harness, the Chassis as well as the Negative Side of the Battery. This Faulty Ground may/can also cause some but not all of the Gauges to Fluctuate Wildly sometimes. If it does not spin at all, it is either a non-clutch type fan or it has a fan that has "Frozen Up". Replace it (Either way).
To test a Fan Clutch: It should be made of Yellowish Plastic. Engine Off. Try to "SPIN" the fan with your hand in either direction. If it spins freely, replace it. If it does not move easily and stops rather quickly after you let go of it, it is good.
If you have just ONE Block Casting Plug go bad, replace all of them and I recommend using Brass Replacements (if I remember right the Part Number is P28C). Aslo, use Permatex Tack on the edges of the relacements and make sure to clean the block "holes". While you have them all out, use a high pressure hose and try to get any Gunk out of the engine block. A SOCKET that just fits inside the edges of the plug will suffice for an installation "tool".
Remember too, there are Casting Plugs on the Front and Rear of the heads too. Those are the same size of "Hole" but take a "Shallow" Plug. If you go here, it would be easier to just pull the engine at that point.
Keep in mind too that you may have "Weak Head Gaskets" and those will still cause overheating without the "Milky Oil" tell tail sign.
89 Vert. 5.0 5Sp. Burgandy, Black Top, Black Interior. SOLD
92 GT Vert. 5.0 AOD White, Black Top, Black Interior.
92 Coupe. 4 Banger 5 Speed. White, Black Interior.
93 Coupe. DECIDING Calypso Green, Black Interior.
94 GT Convertible 5.0 5 Sp. Red Black/Gray Interior.
95 GT Coupe 5.0 5 Sp. Red, Black Interior.
Last edited by Jon Evenoff; 06-30-2019 at 12:26 PM.