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Blower motor only on high


JOHNCROFTON

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1994 Ranger, a/c works good, but now only on max. What do I check first?
 


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Dirtman

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The blower motor resistor is bad.
 

work2do

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As said above. Resistor, cheap fix, easy to access.
 

sgtsandman

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Resistor is bad or the connector for the fan in the engine bay is corroded (the connector for the resistor might be there too. It's been a good number of years since I did the repair). My '98 had the latter. It damn near caught fire before it shorted out. Ford dealerships sell pigtails for that if you find the original connector is toast.
 

sgtsandman

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RonD

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Drawing of blower(fan) and heater box in engine bay: http://econtent.autozone.com:24991/znetrgs/repair_guide_content/en_us/images//0900c152/80/18/ee/e1//medium/0900c1528018eee1.gif

To the right of blower hole is the Resistor block, with a 4 or 5 wire connector
The resistors are INSIDE the heater box, the fan cools them
Pull out the 2 screws and pull it out resistor block

It will look like this: https://easyautodiagnostics.com/images/articles-700-799/790/795/image_1.jpg

Replace it

High speed on the fan by-passes resistor block, lower speeds use resistor block
 

work2do

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Johncrofton, hope you have the issue solved. As said above, the resistor is screwed into the blower housing, passenger side under the hood. Pretty sure it's the same on all years, at least 1993-2011. Sgtsandman mentioned above corrosion on connections. Be certain to get a new pigtail connection and splice.

It looks like a one minute repair. Just remove a screw (7mm?) and plastic wire connector. Nope... in most cases the resistor and wire connector are welded together by corrosion. Had to do it on my '99 years ago and my '10 recently. Soldered and heat shrinked (best way) years back. Getting lazier and butt spliced last time. Either way, simple and inexpensive.

If I had a 2019 + Ranger with the same problem my head would explode thinking about the possibility of needing a new control unit and diagnostics to tell me it'll only cost 900 bucks...bad dream
 

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Johncrofton, hope you have the issue solved. As said above, the resistor is screwed into the blower housing, passenger side under the hood. Pretty sure it's the same on all years, at least 1993-2011. Sgtsandman mentioned above corrosion on connections. Be certain to get a new pigtail connection and splice.

It looks like a one minute repair. Just remove a screw (7mm?) and plastic wire connector. Nope... in most cases the resistor and wire connector are welded together by corrosion. Had to do it on my '99 years ago and my '10 recently. Soldered and heat shrinked (best way) years back. Getting lazier and butt spliced last time. Either way, simple and inexpensive.

If I had a 2019 + Ranger with the same problem my head would explode thinking about the possibility of needing a new control unit and diagnostics to tell me it'll only cost 900 bucks...bad dream
If you owned a 2019 Ranger with a blower motor issue, you’d probably take it to the dealer for the recall.
 


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