Question about 1999 Cadillac DeVille
1 make sure you have the correct radiator for your car.
What probably is going on is that the radiator manufacturer just make a radiator for your vehecle that also covers the vehicles with an oil cooler. If you look carefully at the left and right holes you should notice that they are different sizes. The bigger holes are for the oil cooler which yours doesn't sound like it was equipped with that option.
If it is the correct radiator there is no problem leaving the holes you don't use open. Or if they came with plastic plugs just leave the plugs in the unused holes.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
Posted on Oct 17, 2010
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Remove the pressure cap. Place it aside for the new radiator.
Drain the coolant into a drain pan. The drain valve is located at the bottom of the radiator. Twist it counterclockwise until the fluid starts to drain. Close the valve when the coolant stops draining.
Locate the transmission lines at the bottom of the radiator. Ensure you mark both of the lines so you will know which one goes where. Unscrew these with a line wrench. Plug the line with a towel to prevent the transmission fluid from leaking out.
Unscrew the radiator hoses at the top and bottom of the radiator. The hoses are held on by hose clamps that can be loosened with a flat head screwdriver. Slide the hoses off the radiator with your fingers after the hose clamp is loosened.
Pry the overflow hose off with your fingers. The hose slides over a tube at the neck of the radiator.
Unscrew the mounting bolts at the base of the radiator. There will be one bolt on each side which can be unbolted with a socket wrench.
Unsnap any sensors connected to the radiator. They will have quick connect fittings that can be undone by separating the tabs and pulling apart.
Unscrew the fan shroud with a socket wrench. The fan shroud will slide off the top of the radiator. You can also remove the cooling fan as it is held onto the fan clutch by four small bolts. You will need a socket wrench to remove.
Lift the radiator out from the hood. You may need assistance as the radiator can be heavy and awkward to lift.
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