1987 Dodge Ram 2.6 Overheating -- tried replacing thermostat, radiator and radiator cap. There is a bolt next to thermostat -- what is that for?
One note- many thermostat elements can be installed backwards and while they will function, they don't allow full flow of the coolant like that.
Dunno what the bolt might be for-
Another possibility is a blown head gasket; if these fail between any combustion chamber and a coolant path, it will heat the devil out of coolant and generally cause exhaust fumes in bubbles in the cooling system.
You can check for signs of rust on your plugs since the cooling engine will **** in coolant and that will leave deposits.
Also check your coolant for any signs of a milkiness and your oil for signs it is turning into hand-lotion.
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