Blower Motor Behaving Badly
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Blower Motor Behaving Badly
Hi All,
This morning I experienced a problem that I'd never seen in my past 12 years. I started off on my commute on a relatively chilly New England morning (30 degrees). I had my AC set to Auto as I usually do, and when the engine warmed up a bit, I expected the heat to start pumping out as its always done. After driving a bit, I noted that the heat was coming on, and feeling down in the footwell, I felt a trickle of warm air. I turned up the temp setting with no effect. I then raised the blower motor speed dial up, but nothing happened until I hit the MAX setting. Then, the heat pumped out like a champ. As soon as I dropped the blower speed setting below MAX, the flow dropped to a trickle.
The fact that all the parts appear to be functional (blower, heater core, etc), tells me there's no connectivity (blown fuse, broken wire) or equipment failure.
For background, this is a 1997 Exp with 5.0L, AWD, Eddie Bauer, Auto everything.
Any advice/guidance would be much appreciated.
Thanks,
Erick
This morning I experienced a problem that I'd never seen in my past 12 years. I started off on my commute on a relatively chilly New England morning (30 degrees). I had my AC set to Auto as I usually do, and when the engine warmed up a bit, I expected the heat to start pumping out as its always done. After driving a bit, I noted that the heat was coming on, and feeling down in the footwell, I felt a trickle of warm air. I turned up the temp setting with no effect. I then raised the blower motor speed dial up, but nothing happened until I hit the MAX setting. Then, the heat pumped out like a champ. As soon as I dropped the blower speed setting below MAX, the flow dropped to a trickle.
The fact that all the parts appear to be functional (blower, heater core, etc), tells me there's no connectivity (blown fuse, broken wire) or equipment failure.
For background, this is a 1997 Exp with 5.0L, AWD, Eddie Bauer, Auto everything.
Any advice/guidance would be much appreciated.
Thanks,
Erick
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Sounds like the blower motor resistor. Check this link.. https://www.ford-trucks.com/forums/1...-help-plz.html
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Sounds like the blower motor resistor. Check this link.. https://www.ford-trucks.com/forums/1...-help-plz.html
Much appreciated.
Erick
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Joined: Feb 2001
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From: Morgan Hill, CA
Had the same problem w/ the auto temp control on a Thunderbird, and the problem was the blower fan speed control module. The reason that it works on high is that the module is by-passed by a relay when you move the fan speed to High.
mike
mike
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Just replaced my blower motor resistor board, what a pain! Virtually impossible to get at. One of the connector blades on the board was completely burned away and the cprresponding connector in the plug was widely spaced, It must have been arcing all its life. Could this be one of the sources of the mysterious spontaneous fires we hear about? Squeezed the connector up in the plug and reassembled with the new resistor board and everythin is OK.
While under the hood I started to look for a reason why my front foglamps weren't working. Switched them on at the switch and as soon as I flipped the lid on the fusebox, they started working again. Tapped each fuse and relay, closed the hood and went for a beer.
While under the hood I started to look for a reason why my front foglamps weren't working. Switched them on at the switch and as soon as I flipped the lid on the fusebox, they started working again. Tapped each fuse and relay, closed the hood and went for a beer.
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Lil help
Since you just went through this pain, would you be so kind as to give me a pointer as to where exactly the motor resistor is located. From a previous email, it sounds like it's in the engine bay, on the passenger's side, but if you could give me a more accurate location to vector me in, I'd appreciate it.
Erick
Erick
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Erick
Mine is a UK spec right-hand drive vehicle but it sounds like just the opposite way round to a left-hand drive with the exception of battery, fuse box and coolant / washer bottles. Looking from the front of the vehicle at the very small space between the blower motor and the AC condenser, underneath the heavy wiring loom which goes across from the blower motor, you should just see the connector to the resistor board. You may have to tie the loom out of the way to get at the resisters, I did. You will need an 1/4 inch drive 8 mm socket, universal joint, medium and long extensions, and a flexible shaft to get the board out, then you have the joy of unfastening the connector. Surprisingly, it all goes back a lot easier than it came out. Good luck!
TonyK
Mine is a UK spec right-hand drive vehicle but it sounds like just the opposite way round to a left-hand drive with the exception of battery, fuse box and coolant / washer bottles. Looking from the front of the vehicle at the very small space between the blower motor and the AC condenser, underneath the heavy wiring loom which goes across from the blower motor, you should just see the connector to the resistor board. You may have to tie the loom out of the way to get at the resisters, I did. You will need an 1/4 inch drive 8 mm socket, universal joint, medium and long extensions, and a flexible shaft to get the board out, then you have the joy of unfastening the connector. Surprisingly, it all goes back a lot easier than it came out. Good luck!
TonyK
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