john latham Report post Posted July 11, 2013 Hi all, Had dead fans on my nieces 07 Edge, so I replaced the complete assembly as per instructions that I found on this site. (Thanks so much for the simplified replacement procedure). Put it all back together and the fans still won't come on, even when in A/C mode. Put 12V direct to the fans and they run. Checked both of the 40A fuses, (this Edge has the trailer opt) and swapped the relay. Still no fans. Any ideas? All suggestions appreciated. Thanks. Share this post Link to post Share on other sites
autom8r Report post Posted July 11, 2013 John: The fan control module needs an output signal from the PCM. if there is no output, the fans will not spool up. Here is a wiring diagram and a link for your use. http://www.justanswer.com/ford/76h2f-ford-edge-2008-ford-edge-awd-fans-not-running.html Good luck. Ford Edge Cooling Fan Wiring.pdf Share this post Link to post Share on other sites
john latham Report post Posted July 12, 2013 Thanks for the info autom8r. Will the signal from the PCM be read as voltage at the connector to the FCM? Share this post Link to post Share on other sites
autom8r Report post Posted July 13, 2013 I believe that it's a pulse width modulated signal from the PCM. You may try to measure voltage and see what you get. Is the PCM throwing codes? Share this post Link to post Share on other sites
thirdgenlxi Report post Posted July 13, 2013 (edited) You can also unplug the A/C high pressure cutoff switch right there near the fan module in the high pressure line and the fans should default to the HIGH setting (with the car running..... and it takes a minute or so for them to kick on, it's not instant) Could also be a PCM on it's way out too. I'll have to look up the pinpoint test to see how to test the signal wire.... we've never seen any problems with them so I've never had to test it out, lol Edited July 13, 2013 by thirdgenlxi 1 Share this post Link to post Share on other sites
autom8r Report post Posted July 14, 2013 You can also unplug the A/C high pressure cutoff switch right there near the fan module in the high pressure line and the fans should default to the HIGH setting (with the car running..... and it takes a minute or so for them to kick on, it's not instant) Could also be a PCM on it's way out too. I'll have to look up the pinpoint test to see how to test the signal wire.... we've never seen any problems with them so I've never had to test it out, lol Whew, glad you could answer his question. I've never thought to measure the output from the PCM. I wonder now if I needlessly replaced my fan assembly! Share this post Link to post Share on other sites
taralauder Report post Posted July 15, 2013 Having same problem with Lincoln MKX 2007 Hot wired both fans directly to battery and they both work. What now ?? Share this post Link to post Share on other sites
thirdgenlxi Report post Posted July 15, 2013 See if there is any codes in it.... though more than likely it's the fan control module Share this post Link to post Share on other sites
john latham Report post Posted July 15, 2013 Hello all, Thanks for the replies. I haven't had a chance to try the suggestions yet but I did run a scan and found no codes. FCM is brand new, it came with the fan assy. Tomorrow I'll try unplugging the a/c pressure switch and see what happens. Sure hope it's not the PCM. Share this post Link to post Share on other sites
chrisford25 Report post Posted July 17, 2013 I'm having the same issue on a 2007 ford edge. I've replaced the fan module and thermostat. The big fan wasn't coming on until I changed the module but even now both fans only come on for about 3-4 seconds at the same time every minute or two and car will start to overheat if stuck in traffic or a drive-thru for to long. The A/c starts blowing warm air when stopped as well. Share this post Link to post Share on other sites
john latham Report post Posted July 19, 2013 Well I found the problem. The new fan control module fried..... I have no idea how it happened. I installed the new fan assembly, connected the plug making sure the retainer clicked in place and then re-connected the battery cable. Did I miss something? Anyway replaced the fried module and everything's working fine. 1 Share this post Link to post Share on other sites
bummy Report post Posted August 28, 2013 I had the same problem Installed a new dorman cooling fan assembly two days ago and now it has stopped working again Gettin power to the module Jumped power to the fans and they run fine No fans with ac running, no fans at high temp, and no fans with the ac pressure switch unplugged Look alike the module again but why. Any ideas of what to look for. 1 Share this post Link to post Share on other sites
thirdgenlxi Report post Posted August 28, 2013 (edited) Make sure the main plug is good and tight snapped in and can't be pulled off without pressing the release tab..... if it's barely making a connection and it's going in and out, it will fry the module in no time. This is why aftermarket fans suck Edited August 28, 2013 by thirdgenlxi Share this post Link to post Share on other sites
bummy Report post Posted August 30, 2013 I ended up getting a salvaged cooing fan assembly and installed it 3 days ago, I went ahead and added a second ground wire to the ground on the plug going into the control module. I used one of those side by side splicer and ran it to the grounding post next to the fuse box under the hood Share this post Link to post Share on other sites
Oillia Report post Posted June 9, 2015 What if the fan don't come on hot wired to the battery? Share this post Link to post Share on other sites
autom8r Report post Posted June 10, 2015 Oillia: What color is the wire you are connecting the hot to? 1 Share this post Link to post Share on other sites
nate.shamblin Report post Posted June 11, 2016 (edited) Wow, the wife's 2007 MKX was overheating and the AC wouldn't work while at a stop. Changed the thermostat and tried to recharge AC. Overheated while charging and the compressor wouldn't stay on. Found out the fans weren't coming on. Tried to hot wire the fans and they wouldn't come on. So ordered a new set from Rock auto. Figured I'd go and try to wiggle the wires to the fan module and BAM, the fans came on. Left it running and recharged the AC and it didn't overheat. Now to figure out how to cancel the rockauto order. Edited June 11, 2016 by nate.shamblin Share this post Link to post Share on other sites
enigma-2 Report post Posted June 12, 2016 (edited) Got to ask Nate, if just wiggling wires makes the fans work, doesn't that seem like there's a real problem in there somewhere? I mean, a loose connection could cause excessive heating and (possibly) a fire. Think I'd be looking a little closer at the wiring connector and make certain that it's rock solid tight. No high load connection should be determined on the basis if wiggling. Just saying... Edited June 12, 2016 by enigma-2 Share this post Link to post Share on other sites
nate.shamblin Report post Posted June 12, 2016 I know. The wife needed to go somewhere and that was my last try. When she gets home.e I'll look at the connector going into the control module. Share this post Link to post Share on other sites
nate.shamblin Report post Posted July 20, 2016 Replaced the FCM, the fans come on when they want. It still overheats. Is there a problem with the plugs on the FCM on these vehicles? I'm ready to throw a match to this thing. Share this post Link to post Share on other sites
nate.shamblin Report post Posted July 21, 2016 Well, turns out that metal cover on the FCM is part of the circuit. If it's loose then the fans don't wrk correctly. Problem is fixed. 2 Share this post Link to post Share on other sites
WWWPerfA_ZN0W Report post Posted July 21, 2016 Good to know, thanks for the update! Share this post Link to post Share on other sites
nate.shamblin Report post Posted August 6, 2016 ANOTHER update. FORD SUCKS! It was still overheating. Finally took it to a shop, they said it needs new fans as well as at her stuff. So instead of paying $800+ for them to do it, I bought a new fan assembly and FCM and just put it in. Still overheating. I REALLY need help here! Share this post Link to post Share on other sites
WWWPerfA_ZN0W Report post Posted August 6, 2016 Stuck thermostat? If the coolant looks good, that would be my goto. There have been TSBs out for problems with the heater core contaminating/clogging the coolant system. In which case a flush + new heater core would be the solution. While it is normal for the coolant level to go down a bit over time, a steady drop over a short period of time is more indicative of a water pump and/or a head gasket leak. Any white smoke out the exhaust? Share this post Link to post Share on other sites
nate.shamblin Report post Posted August 6, 2016 Ok, we'll turns oUT the FCM that comes with the new fan assembly can be plugged into both ways. Crisis averted. I still hate this car! 1 Share this post Link to post Share on other sites
