The electrical connection is not good. Works on high speed only unless you use electrical spray on connection.
SOURCE: 2006 Toyota Tacoma heat/AC fan runs on high only
replace the blower motor speed control resistor.
SOURCE: Toyota 2000 camry fan only working on high speed
The blower motor resistor pack is defective and must be replaced. The resistor pack controls the variable speeds.
SOURCE: how to fix compass of toyota tacoma 2007. it just
Are your cruise control, dome, and tail lights also out? If so then it
is a fuse. If not then the control unit has gone bad internally. You may
be able to get it fixed under your warranty.
If it is not covered by your warranty, check out
www.autoclockrepair.com. We offer a very reasonable repair solution.
SOURCE: replacing front struts on a 2007 toyota tacoma
REALLY HARD PROJECT, TAKE IT TO SEARS, IT WILL ALSO NEED FRONT ALLIGNMENT
Might be the Resistor pack located close to the blower. Could be under the dash or under the hood, but always close to the blower itself. Usually has a flat connector with 4 or 5 wires, and two small screws holding in the duct. It may be a crispy critter. It happens... The blower moves air across it to keep it cool. The blower motor may be bad as well, or possibly the fan speed switch. May very well be the fuse for the blower as well. The blower connector may be loose. Let me know what you find.
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