Blower Motor Will Not Work at All - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

 
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post #1 of 7 (permalink) Old 01-25-2019, 12:45 PM Thread Starter
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Blower Motor Will Not Work at All

I have a 1997 F250 7.3 and out of the blue when I went to turn my heat on, the blower did not kick in at all. I unplugged the blower motor and probed the connector with the switch set to high to see if there was power going to the blower, and there wasn't (I also replaced the blower motor about a year go). I also checked the fuse in the cab for the blower motor and it was fine. I then probed the fuse location to see if power was coming to the hot side of the fuse and there was no power there either. My climate control vent selector still works, as well as the temperature selector, the fan speed selector does nothing though. Does anyone have any ideas for what I can check next?
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post #2 of 7 (permalink) Old 01-25-2019, 03:58 PM
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I haven't checked on these trucks but most vehicles switch the ground on these type of things. You also might want to check the blower resistor on the housing.

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post #3 of 7 (permalink) Old 01-25-2019, 09:07 PM
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Does it NOT blow in all speed settings, or will it run on HIGH speed, but nothing on low & medium?

If that's the case, it's most definitely the blower motor speed control resistor module.

Usually on the blower housing somewhere. On the newer trucks, it's under the hood on the blower housing...






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Last edited by Calico5; 01-25-2019 at 09:21 PM.
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post #4 of 7 (permalink) Old 01-25-2019, 10:21 PM
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Quote:
Originally Posted by Melamed555 View Post
I also checked the fuse in the cab for the blower motor and it was fine. I then probed the fuse location to see if power was coming to the hot side of the fuse and there was no power there either.
This eliminates the resistor & control panel as causes since they're DOWNstream of the dash fuse:


(phone app link)


I'd start by checking the underhood fuse that serves this dash fuse. Find it using your owner's manual, or this site:
BBB Industries- Premium Alternators, Starters, Power Steering Products and Turbochargers | TSB's & Wiring Diagrams
The email you use to get access doesn't have to be yours or real. When you see the red WIRING DIAGRAMS button, click it.

If the underhood fuse is blown, post EVERYTHING else that's on that fuse, and start checking those things for damage that could have caused a short.


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post #5 of 7 (permalink) Old 01-25-2019, 11:14 PM
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Quote:
Originally Posted by Melamed555 View Post
I also checked the fuse in the cab for the blower motor and it was fine. I then probed the fuse location to see if power was coming to the hot side of the fuse and there was no power there either.
Quote:
Originally Posted by Steve83 View Post
This eliminates the resistor & control panel as causes since they're DOWNstream of the dash fuse:

Ooops, sorry, guess I read right past that, LOL.


Disregard...

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post #6 of 7 (permalink) Old 01-26-2019, 10:37 AM
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Blower is powered by underdash fuse #1, which is powered by underhood fuse #15 (50A Maxifuse). Cheers!

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post #7 of 7 (permalink) Old 01-26-2019, 03:24 PM Thread Starter
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Thank you both for your replies and for the pictures. Prior to this issue I only had the high fan speed setting which made me assume the resistor was bad, I just never got around to changing it because I always used the high setting. But my problem now is that the fan does not blow at all in any position, including high.

I never checked the under-hood fuse because I had no idea it tied into the blower motor. I will check it today!

Thanks!
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