Flashing Temp Light

[rhaehnel]

I know this is an old thread, but it was really helpful. I have a similar problem that I have been trying to diagnose. I replaced the coolant cap, engine compartment temperature sensor and coolant level sensor, but still the light keeps blinking. I have tried to check the wiring with the assumption that the circuit is normally closed when the coolant is topped off. This thread gave me the tip that full = normally open. I disconnected the connector to the coolant sensor and the light went off. Real progress! Thanks

Now I need to figure out why the circuit is closed with the connector attached and full on coolant, but that should easy now that I understand the system logic.