2003 Mustang Gt Cooling Fan Failure Ford Mustang Forum 2003 gt mustang cooling fan circuit! here's a 2003 gt mustang fan circuit diagram. to view it click on the link below. first thing to do is to disconnect your negative battery cable from the battery. then check the fuses in both fuse boxes. your car manual will tell you where these fuse boxes are. Does the fan run? now switch to the other color wire in the fan connector. does the fan run at a different speed? if using scrap wire is a problem, they make test probes just for this sort of thing. some even come with fuses. an old style battery charger can sometimes be used. the new style chargers that have reversal protection won't work.
Ford Mustang Forum Cooling Fan High Speed Mode Not Working Cooling fan motor not coming on? here is the 2003 gt mustang 4.6 fan circuit diagram. notice there are two fuses in the circuit, the 50 amp and 30 amp. make sure you remove each fuse and check with a tester. visual inspections are not dependable. also, clean out your fan motor wire connector terminals. Jun 30, 2019. #2. hands down. the easiest way to trouble shoot a cooling fan "issue" is to use an odb2 scanner with bi directional controls to "command" the fan to run. this offers an easy way to see what is happening by testing for voltage at various points. create an attack plan based upon what works (high low speed) and what does not work. 17. wilmington,de. feb 5, 2012. #3. wmburns said: the cooling fan and ccrm control system uses what is called "fail safe" mode. which means that if the communications path between the ccrm and pcm is broken, the cooling fan will run in low speed mode. in other words, it takes a signal from the pcm to not run the fan. 9. 93grnlx. 1716 posts · joined 2009. #9 · mar 30, 2011. you may be correct but he should fix the fan issue first and then see if the temps go back up , if its really cold out and hes running a 160 180 degree tstat with the fan running all the time its probably bouncing between 150 180 range. reply like.
Ford Mustang Forum Cooling Fan High Speed Mode Not Working 17. wilmington,de. feb 5, 2012. #3. wmburns said: the cooling fan and ccrm control system uses what is called "fail safe" mode. which means that if the communications path between the ccrm and pcm is broken, the cooling fan will run in low speed mode. in other words, it takes a signal from the pcm to not run the fan. 9. 93grnlx. 1716 posts · joined 2009. #9 · mar 30, 2011. you may be correct but he should fix the fan issue first and then see if the temps go back up , if its really cold out and hes running a 160 180 degree tstat with the fan running all the time its probably bouncing between 150 180 range. reply like. Normally if the fan is bad it would overheat long before 15 minutes of standing still, but outside temperatures will affect that. if the fuse and fan checks out, my guess is a problem with the relay switching between high and low fan speed, causing insufficient cooling after a while of idling. 2003 mustang gt. However i took it to another mechanic and he found that when the fan blew out the first time it fried the connecting wire. this kept the fan from being plugged in properly. the second time since it wasn't plugged in all the way it arced and burned out the fan as well as the plug. i scoured junk yards till i found a new plug i could splice in.
Cooling Fan Trouble Ford Mustang Forum Normally if the fan is bad it would overheat long before 15 minutes of standing still, but outside temperatures will affect that. if the fuse and fan checks out, my guess is a problem with the relay switching between high and low fan speed, causing insufficient cooling after a while of idling. 2003 mustang gt. However i took it to another mechanic and he found that when the fan blew out the first time it fried the connecting wire. this kept the fan from being plugged in properly. the second time since it wasn't plugged in all the way it arced and burned out the fan as well as the plug. i scoured junk yards till i found a new plug i could splice in.
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