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With the engine at such low temp I suspect that the glow plugs in the head are not working. They are there to ignite the vaporised fuel in the cylinder and assist in starting. Have them checked out and replace if faulty
I have a '93 Ranger 4.0 4x4 and had the same problem before. Make sure the distributer isnt wet and make sure all connections are tight. I took mine through some mud, got the distributer wet, and it died and wouldnt start until it dried. Hope this helped!
Is the blower blowing? if not could be a blown fuse or bad blower. If the blower is working make sure your coolant level is full, If both of theese things check out , you may have a vacume line loose somewhere that controls the duct witch controls it to change to defrost ,vent or hot to cold.
possibly distributor cap getting wet. Try this. When it's not starting, remove distributor cap and dry inside and outside with hair dryer on warm setting. See if it starts then. If yes, replace cap and rotor and make sure plug wires are clean.
If it still doesn't start, you may be getting mositure in a wire connector that operates spark to plugs.
Are you getting spark at plugs when it own't start? Check by getting a spark plug and plugging a spark plug wire into it and grounding the side of the plug. crank engine and watch for spark at gap.
First thing you need to check is the coolant temperature switch which is located in the head or inlet manifold area. Basically it measures the temperature of the coolant and tells the ECU to increase fuel for cold starts.