Sorry I knows this subject has been gone over before but I need help on what part I should buy. Cooling fan wont come on at any temp or with ac or defrost on. fuse is good. I have 12v at fan motor and the thin white wire also has voltage starting at about 1/2 a volt and climbing as the engine heats up. sounds like the fan is bad BUT when I eliminate the thin white wire from the plug end the fan comes on full speed and runs perfectly but will never shut off. Anyone with any help would be so appreciated.