jgordon10 Posted August 27, 2015 Report Share Posted August 27, 2015 I have a 2008 Edge with towing package. Last week it overheated on my wife and the check engine light came on with code P0480: Cooling fan 1 Control Circuit Malfunction. Assuming it was either a fan problem or the fan relay problem, I bought the whole cooling fan assembly on Amazon and replaced it today. After replacing it, neither fan turned on when I started the Edge. I took it out for a drive and once the car reached normal temperature (gauge in middle between hot/cold) BOTH fans kicked on and never turned off. Even after I got home and shut the car off BOTH fans continued to run loudly for 10 minutes until I pulled the fuse. I'm stumped... Could the Coolant Temp Sensor cause this kind of issue? Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted August 27, 2015 Report Share Posted August 27, 2015 Don't the fans normally run after you shut off the car? Thought that was normal. Is the temp in normal level when idling? This is the only time the fans should be operating (at highway speeds, there's enough air flowing through the radiator to keep the engine cool). Quote Link to comment Share on other sites More sharing options...
PaulSchott Posted August 27, 2015 Report Share Posted August 27, 2015 I have turned my 2007 off with the fans running and they continue for only about 5 seconds max. It may be that your car is overheating and they are designed to run longer. How high is your temp gauge running? Will they turn off if you don't pull the plug? If the A/C is running and the car isn't hot do they turn off when you shut the car? Quote Link to comment Share on other sites More sharing options...
jgordon10 Posted August 27, 2015 Author Report Share Posted August 27, 2015 I sat in the car last night for 10 minutes after I shut the engine off and the fans never shut off, so I ended up pulling the fuses. After the car sat overnight I went out and put the fuses back in this morning and both fans fired right up. So for some reason they are getting a constant power signal to run, even when the key isn't in the ignition. So I went from the old fans that wouldn't engage at all (which caused the overheating), to new fans that won't shut off! I tried everything I could think of, but in the end I took the Edge to a mechanic this morning. My only hypothesis is that the coolant temp sensor is broken, causing the PCM to think the engine is constantly overheating and causing the fans to run. Thanks for your help. I will post whatever the mechanic finds.. Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted August 28, 2015 Report Share Posted August 28, 2015 Believe the fans will run continously if system is set to max ac. Let us know what you find. Quote Link to comment Share on other sites More sharing options...
shnouz Posted September 3, 2015 Report Share Posted September 3, 2015 Have you resolved your issue? Having the same exact issue with the fans staying on. I sat in the car last night for 10 minutes after I shut the engine off and the fans never shut off, so I ended up pulling the fuses. After the car sat overnight I went out and put the fuses back in this morning and both fans fired right up. So for some reason they are getting a constant power signal to run, even when the key isn't in the ignition. So I went from the old fans that wouldn't engage at all (which caused the overheating), to new fans that won't shut off! I tried everything I could think of, but in the end I took the Edge to a mechanic this morning. My only hypothesis is that the coolant temp sensor is broken, causing the PCM to think the engine is constantly overheating and causing the fans to run. Thanks for your help. I will post whatever the mechanic finds.. Quote Link to comment Share on other sites More sharing options...
bplemmons Posted September 3, 2015 Report Share Posted September 3, 2015 I am having the same issue with mine, I just saw this post after asking about it but I see no answer here yet...... Any updates? Bill Quote Link to comment Share on other sites More sharing options...
eldude12 Posted October 1, 2015 Report Share Posted October 1, 2015 I'm currently having the same issue, did anybody find a fix to this. The EXACT same problem. Quote Link to comment Share on other sites More sharing options...
Susan.shields Posted May 6, 2016 Report Share Posted May 6, 2016 I'm having the exact same issue with my 2009 Ford Edge. Would someone please post a solution? Quote Link to comment Share on other sites More sharing options...
macbwt Posted May 7, 2016 Report Share Posted May 7, 2016 The best solution is to have a diagnostic performed to ensure the temp sensor is functioning properly and not defaulted to the open/run position. It is obvious the circuit is remaining powered so a trace back to the sensor is the most logical solution to determine if the sensor is shutting down properly. Quote Link to comment Share on other sites More sharing options...
macbwt Posted May 7, 2016 Report Share Posted May 7, 2016 The CHT sensor is a thermistor device in which resistance changes with the temperature. The electrical resistance of a thermistor decreases as temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.The CHT sensor is installed in the cylinder head and measures the metal temperature. The CHT sensor can provide complete engine temperature information and can be used to infer coolant temperature. If the CHT sensor conveys an overheating condition to the PCM, the PCM initiates a fail-safe cooling strategy based on information from the CHT sensor. A cooling system concern such as low coolant or coolant loss could cause an overheating condition. As a result, damage to major engine components could occur. Using both the CHT sensor and fail-safe cooling strategy, the PCM prevents damage by allowing air cooling of the engine and limp home capability. 1 Quote Link to comment Share on other sites More sharing options...
Pibar Posted June 15, 2016 Report Share Posted June 15, 2016 Did anyone have any luck fixing this issue? I'm having the same problem. Fan assembly was replaced and now the fans will not turn off when car is even well below operating temp. They will run until unplugged. Also, they are both working simultaneously. Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted June 16, 2016 Report Share Posted June 16, 2016 Which brand did you install? Have had reports that aftermarket doesn't do so good, OEM (Motorcraft) is best. Sometimes the A/C pressure switch (ACPSW) could be the issue. Also, carry out the PCM self-test to access any DTCs. Record any key on engine off (KOEO), key on engine running (KOER) (if the engine runs) and continuous memory (MIL and non-MIL) DTCs Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted June 16, 2016 Report Share Posted June 16, 2016 If I remember correctly, someone here in the forum (or in another related forum) found that the wiring connector on the aftermarket fan assy was wired differently. Couple of wires were reversed, and that caused the fans to run continously. Should be able to find which terminals to change in the connector if you Google it. 1 Quote Link to comment Share on other sites More sharing options...
Pibar Posted June 16, 2016 Report Share Posted June 16, 2016 Thanks for the reply. I think this is out of my reach of expertise. The fans are the Oreillys brand. Murray brand. I even took back the first set of fans because I thought the constant running was a faulty module. I took the module off the new assembly and put it on the old assembly and one fan automatically started running. If it were a wiring problem it would have to be inside the module itself. I believe it's something with the ac system or the cylinder head temperature sensor. I'm taking it to the dealer later today:| I WILL POST THE OUTCOME. This is my first time on a forum but I have benefited from other posts in the past. I will post outcome to hopefully help someone in the future. 1 Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted June 16, 2016 Report Share Posted June 16, 2016 Ummmm, I wonder what would have happened if you had put you old controller on the new fan assembly? If I remember it was the wiring coming off the controller that had the two wires reversed at the connector. I'll see if I can find the reference. Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted June 16, 2016 Report Share Posted June 16, 2016 I took the module off the new assembly and put it on the old assembly and one fan automatically started running. If it were a wiring problem it would have to be inside the module itself. Just "one" fan was running. Shouldn't both be running? What caused you to replace the fan assembly in the first place, were neither of them running? Btw, are you testing with the AC turned off? With ac on, both fans should be running. Quote Link to comment Share on other sites More sharing options...
Pibar Posted June 16, 2016 Report Share Posted June 16, 2016 (edited) Here's my experience from the beginning... Car overheated. I noticed the fans weren't running. Fuses checked out. I replaced the assembly with assembly purchased at oreillys(Murray brand). I did this in a Texas 100 degree store parking lot being I was an hour away from home. Immediately after plugging the assembly in(car off) the fans started. They ran slow. I thought this was ok being that the others wouldnt turn on period. After replacing them I went through a drive thru. While waiting, A/C started blowing warm and car started over heating again. I was able to get home because the rest of the way home was highway and temp stayed normal. The A/C blew cold the whole way. When I got home the fans were off even with the A/C full blast. Shut the car off and noticed the fans started up. They stayed on for hours. I finally pulled the plug off the module. Next day I started the car to look into it some more. I noticed that when the ac compressor kicks on, the fans (both) kick on for a few seconds and shut off. It did this every time the ac compressor kicked on. Both fans are working together. Either both on, or both off. This happened with both aftermarket assemblies. We shall she what the verdict is.... Edited June 16, 2016 by Pibar Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted June 17, 2016 Report Share Posted June 17, 2016 Are you getting any codes? (No code checker, take to Auto Zone or simular) and have them read. Quote Link to comment Share on other sites More sharing options...
Pibar Posted June 17, 2016 Report Share Posted June 17, 2016 I took it to auto zone and no codes were present. Quote Link to comment Share on other sites More sharing options...
Pibar Posted June 25, 2016 Report Share Posted June 25, 2016 Verdict: 2 bad assemblies from Oreilly auto parts. The module was bad in both apparently. The dealer placed the factory module off of my assembly onto the new fan assembly. Waalaahh. It works. I originally tried the opposite with no luck("new" module on old fan assembly.) Hope this helps. 2 Quote Link to comment Share on other sites More sharing options...
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