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My 08' Ford edge overheated the other day while idling for 15 min. The coolant overflowed and emptied and I got a P1299 error code. I thought it might be the thermostat but I checked the ECT and the radiator didn't start heating up till after 180ºF. After the temp got over 205ºF one fan kicked on but even with the A/C on the second fan never kicked on. I ran the car for a while idling and the temp never got about 216ºF even with some revs. Am I dealing with a cooling fan replacement or the temp sensor? Does anyone have suggestions on what to check next? I checked the fuse (no towing package) and the fuse in the hood fuse box was fine.

My 08 MKX is overheating. I tested both fans direct to 12V and they both work. So I was pretty sure it was the Fan Control Module that was bad, but after a little more testing, I am not so sure anymore. Please feel free to chime in if you have the answer to any of the below questions. 1- To help further test, does anyone know at what temp the fans are suppose to come on? 2- And what triggers - or sends power to the Fan Control Module to turn on the fans? (is it the coolant temp sensor)? The main connector that plugs into the FCM has 3 wires (12v + Ground + a small white wire). I tested the small white wire for power (with a test light) and nothing, I tested it for power all the way up to 206 degrees F (then I shut the car off as I didn’t want it to overheat) 3- Does anyone know when and how that small white wire from the FCM should have power - if that’s what triggers the fans to turn on? 4- With my OBDII scanner, I can monitor the ect (engine coolant temp) and the temp seems accurate, would this confirm that my ect sensor is not the fault here?