The Ford Barn

mcgarrett · 04-02-2022, 10:08 AM

The problem I'm having is that the temp gauge's behavior is very erratic, for example; at times the needle seems to indicate temperature correctly by moving from the HOT side of the gauge when the ignition switch is in the OFF position and advancing slowly to the COLD side of the gauge when the ignition is switched ON and proceeding to register temperature accordingly as the engine warms up. At other times, when I turn the ignition switch to ON, the needle advances RAPIDLY to the COLD side of the gauge and remains there even after the engine warms up. I don't understand what is causing this. Any ideas?

04-02-2022, 10:08 AM	#1
mcgarrett Senior Member Join Date: Dec 2013 Location: Corsicana, Texas Posts: 1,306	1940 Ford temp sending unit troubleshooting The problem I'm having is that the temp gauge's behavior is very erratic, for example; at times the needle seems to indicate temperature correctly by moving from the HOT side of the gauge when the ignition switch is in the OFF position and advancing slowly to the COLD side of the gauge when the ignition is switched ON and proceeding to register temperature accordingly as the engine warms up. At other times, when I turn the ignition switch to ON, the needle advances RAPIDLY to the COLD side of the gauge and remains there even after the engine warms up. I don't understand what is causing this. Any ideas?