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The good news is that it's not the most expensive part...the heater fan motor. You didn't say the year of your truck so I'll mention both the fuse and the resister. On some older models the low and high fans are on different fuses with the low fan fuse being an in line fuse. There is a resistor usually located under the hood near the heater motor that will also cause the problem.
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∙ 13y ago
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Why your 1999fordrangerheateronlyonhigh?
truck blower only work on high
What would cause a Toyota Camry to only blow on high?
The blower motor resistor is defective.
Air only blow when set on high Is the resister bad?
needs new blower resistor
Why doesnt the blower motor only blow on hi on 1999 Mitsubishi galant?
the blower resistor is bypassed on high. a direct path to ground. if high is the only operational speed the resistor is bad.
What do you do if your 1998 Nissan sentra blower motor only blow on high speed?
More than likely the blower motor speed resistor burned out.
How do I fix 1997 k1500 Chevy truck blower that only works on high fan setting?
The blower motor resistor pack is defective. Replace it.
If The air in your truck only works on high do you need a new switch?
possibly a blower motor. or switch
What causes an ac-heater in a Nissan Sentra to only blow on high?
you need a new blower motor resistor
Why does the fan only blow on high speed on a 96 full size pickup?
blower motor resistor is bad
What causes the blower on a atc to blow only hi?
Blower speed resister is burned out.
Is there a relay switch for the heater on a 1994 Chevy truck?
Only for the high speed blower function. The lower speeds go thru the blower motor speed resister.
Why would the AC only blow on High and not low on a 2001 S10 Blazer?
The blower motor speed resister is probably burned out.
