Doubt it's the switch ,but you never know until testing is done . Do you know what that is ? Automotive systems electrical testing , view a wiring diagram too see what all is involved in said circuit ,an using a DVOM - digital volt ohm meter to test B+ voltage an ground ? Looking at the wiring diagram for the blower motor circuit for your vehicle i see a blower motor relay , a blower motor resistor pack an the blower motor switch . The switch is just a path to ground . If it doesn't work on high speed i would suspect the blower motor relay . View the wiring diagram here
http://www.bbbind.com/free_tsb.html Enter your vehicle information , year , make , model and engine size. Under system click on HVAC ,then under subsystem HVAC controls will come up on it's own . Click the search button then the blue link . Buy a cheap volt meter an test the circuit . That is after watching these videos .
Electric Testing Techniques You Need to Know
The Trainer 32 How To Read An Automotive Block Wiring Diagram
Learn how to test an save money , it's easy ! Is there B+ voltage at the relay .Also check out how a relay work's an how to test .
SOURCE: blower fan
Sounds like the problem is more with the blower motor assembly itself. The blower motor have micro-proccers built itnto them which comunicate with the control heads and do the actual regulating of the fan motor. Dealers have computers with diagnostic software which allows them to monitor what is happening in the eletronic controls of the vehicle. Electronic diagnostics without the diagnostic software makes it very diffecult to pinpoint the actual item causing the problem.
SOURCE: My heater and ac fan speed is not working is the
Your blower motor is probably fine, it is the electronic mechanism that governs the speed of it that has gone haywire. Call the dealer and asked them where it is and how much. Then go to a junkyard and grab one.
Yes both relay and switch are possible.Needs to be inspected. http://schematicsdiagram.blogspot.com/2011/12/blower-motor-resistor-shorting-problem.html How to remove Blower
control switch?
http://howtobyme.blogspot.in/2012/02/how-to-remove-blower-control-switch-on.html --------- Where is blower motor relay located ?
http://technoanswers.blogspot.in/2012/02/where-is-blower-motor-relay-located-on.html -------- This will help.Thanks.
Blower motor replacing for all vehicles?
http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html
Blower motor Resistor
shorting problem?
Usually the first thing to inspect when the blower fan stops working is the fuses to see if any are blown. Locate the 10A cluster fuse or the 25A HVAC fuse in your car manual, and examine them to determine if they need replacing. The car owner's manual will tell you where to find the fuses that are connected to the heat and/or air conditioning. On the interior fuse panel of the car, a 30 amp fuse is labeled "Heater" or "HVAC."
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