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Old 10-22-2015, 06:59 PM
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Old 02-16-2009, 09:31 AM   #1
pharmd2010
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Default AC/Heater fan not working...

Ok, my fan was working fine last week. I went on a weekend trip and left the car at home. After coming back and leaving for school this morning, my heater fan would not come on. I turned the AC on and the fan won't come on for either the heat or the AC. Everything else works. The air changes from hot to cold, the switch works to change from vents to floor, etc and the AC compressor will come on. The only thing not working is the fan. It doesn't change from 1-4 on the settings. Other than a fuse, can this be any other problem? I was just asking before I go start diagnosing the thing. Any help would be appreciated!
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Old 02-16-2009, 02:55 PM   #2
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It could be caused by a bad fuse(#2 fuse shown in this schematic of the fuse box in the engine compartment): http://www.allfordmustangs.com/forum...pe-air-bec.gif

Or it could be caused by a bad blower speed selector switch, blower, blower relay, ground, wire, or wire connection:
http://iihs.net/fsm/?dir=40&viewfile...l%20System.pdf
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Old 02-16-2009, 03:51 PM   #3
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Quote:
Originally Posted by ski View Post
It could be caused by a bad fuse(#2 fuse shown in this schematic of the fuse box in the engine compartment): http://www.allfordmustangs.com/forum...pe-air-bec.gif

Or it could be caused by a bad blower speed selector switch, blower, blower relay, ground, wire, or wire connection:
http://iihs.net/fsm/?dir=40&viewfile...l%20System.pdf
It could also be the air plenum mounted blower motor
resistor assembly.
.
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Old 02-17-2009, 01:28 AM   #4
BillyBobJoe
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I have a similar problem. Sometimes on long trips, I've noticed that the fan seems to crap out. I can change from 1-4 and it sounds like maybe the fan is blowing but no air is actually coming out of the vents, no matter which setting. I can't tell if the temperature is gone too but I think it fails too. Usually it's after like 5 hours in the car though but with my warranty running out next month, I guess I should have it looked at.
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Old 02-17-2009, 10:42 AM   #5
sailing220
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In my experience the whole A/C system on these cars is pretty crappy. The different directional selectors (feet, head +feet, etc.) are worthless. My head+feet blows only to the feet, the defroster only blows into the cabin as well, etc. My fan itself has never had problems. I would check the fuse and if it still isn't fixed bring it in.
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Old 02-17-2009, 03:01 PM   #6
pharmd2010
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Got it fixed. It was just a fuse. Thanks though!
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Old 02-17-2009, 04:18 PM   #7
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Quote:
Originally Posted by 157db View Post
It could also be the air plenum mounted blower motor
resistor assembly.
.
It can be the cause in some cases, but not with the OP's fan. The reason is because the OP stated that the fan did not work in any of the speed settings(1-4), and the current does not pass thru the blower motor resistor assembly to the fan motor in the highest speed setting(4) according to the electrical schematic.

Last edited by ski; 02-17-2009 at 04:21 PM.
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Old 02-17-2009, 04:20 PM   #8
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Quote:
Originally Posted by pharmd2010 View Post
Got it fixed. It was just a fuse. Thanks though!
You're welcome. Glad that you fixed the problem.
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Old 02-18-2009, 08:51 PM   #9
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Quote:
Originally Posted by ski View Post
It can be the cause in some cases, but not with the OP's fan. The reason is because the OP stated that the fan did not work in any of the speed settings(1-4), and the current does not pass thru the blower motor resistor assembly to the fan motor in the highest speed setting(4) according to the electrical schematic.
Short time to post and get all that info in there in time.
I get the schematic layout of the S197 stang and that
HIGH (that bypasses the speed resistor) should still
work when the resistor assembly is bad. I have helped
with many blower problems and it tends to be the connector
on the fan switch itself that cannot handle the fan/resistor
currents without overheating and loosing all connections.
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