Blower motor
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Cross-Country
Joined: Jan 2014
Posts: 64
Likes: 12
From: Waco,Tx
Blower motor
Hello FTE! First post here, been watching from the shadows for a while and decided to join in.
On my '92 F250 I've been having an issue with the blower motor continuously blowing even while the switch is off. If I turn it to the off position and I'm wearing tennis shoes I can feel it blowing from the floor on my ankles.
I replaced the AC (7 position) switch It worked once and then just did what the old one did. Is the blower supposed to shut down with to control switch or is it supposed to run all the time and the vacuum controlled door supposed to route the flow elsewhere?
Thanks in advance for the knowledge!
On my '92 F250 I've been having an issue with the blower motor continuously blowing even while the switch is off. If I turn it to the off position and I'm wearing tennis shoes I can feel it blowing from the floor on my ankles.
I replaced the AC (7 position) switch It worked once and then just did what the old one did. Is the blower supposed to shut down with to control switch or is it supposed to run all the time and the vacuum controlled door supposed to route the flow elsewhere?
Thanks in advance for the knowledge!
Cargo Master
Joined: Jul 2009
Posts: 2,538
Likes: 54
From: Des Moines
I don't know about your truck in particular, but some blower motor circuits/switches will run continuously even when the switch is in the off position. In these cases, it's not that the switch is actually off, it's just that the circuit is routed through a high value resistor(s) before reaching the blower motor. Now, whether or not those resistors are intended to drop all or most of the supply voltage, I don't know, but in many cases, it ends up allowing a little voltage to reach the blower motor. In theory it shouldn't be enough to operate the blower motor but it still can.
I guess the question is- is it very noticeable that the blower motor is on (meaning no difference between off and the lowest setting, for example) or is it barely noticeable? Again, I don't know about your truck in particular, but if it's barely noticeable, it's probably normal operation.
I guess the question is- is it very noticeable that the blower motor is on (meaning no difference between off and the lowest setting, for example) or is it barely noticeable? Again, I don't know about your truck in particular, but if it's barely noticeable, it's probably normal operation.
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Cross-Country
Joined: Jan 2014
Posts: 64
Likes: 12
From: Waco,Tx
Its very noticeable, besides feeling it on my ankles It gets warm or cool based off the temp **** and if I reach my hand down it feels as if the blower is on low. So theres no difference between low and off right now and it only comes out the floor vents.
Lead Driver
Joined: Jul 2007
Posts: 7,868
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From: Rhode Island
I bet its not the blower motor running, and you're just feeling air being forced in through the cowl vent while driving. I believe normal operation is to switch to "recirculate" in the off position to prevent that.
See if you can feel the air blowing with the key on, engine off.
See if you can feel the air blowing with the key on, engine off.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
The blower switch does not have a "OFF" position, it only goes to low.
The vacuum control will turn off the blower motor in the "OFF" position and as said above with the vacuum control in the "OFF" vacuum will be sent to the recirculate vacuum motor.
So I would say check the white vacuum line above the blower box under the hood for a vacuum leak.
The vacuum control will turn off the blower motor in the "OFF" position and as said above with the vacuum control in the "OFF" vacuum will be sent to the recirculate vacuum motor.
So I would say check the white vacuum line above the blower box under the hood for a vacuum leak.
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Cross-Country
Joined: Jan 2014
Posts: 64
Likes: 12
From: Waco,Tx
Found the white vacuum line today, some little gray whiskered jerk chewed into it. I guess I'll be getting a new section of vacuum line (and some green bars) and we'll see if that solves it. Thanks
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