Where is the blower motor switch located

That usually means a bad Blower Motor resister which is located in the blower housing, next to the blower motor under the dash on the passenger side..

Does it work if you tap it with it switched on? If so, then you have a worn out motor, and need to replace it.

Check power to the motor. If you have power, then replace the motor.

If you don't have power, then check the switch mechanism.

Check whether you might have bad connection or contact,or e ven bad switch.

I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

check connection at blower motor, you can put a test light on the hot wire to the blower and see if it lights on any of the speeds selected

You describe a common occurance with the manual type A/C control knob/switch. Also, the blower motor brushes are also a common issue. The notion it's wiring or fuse is not a common occurance. There's a couple of things you'll want to inspect/examine before you start throwing money at parts. First, key ON, blower switch on HIGH, RH side under the dash, locate the blower motor housing & slap it firmly with your hand. If the motor starts running, then the problem is in the blower motor itself (brushes, intermittent contact or NO contact). If the motor does not respond after this (shock test), rig yourself a 12 volt test light and back-probe the two-wire connector (black wire and red wire) to see if the light turns on when the blower speed switch/knob is on. If the light comes on, you know you have power and ground applied/available at the motor itself, but it isn't working/running - therefore its the blower motor itself. If the light DOESN'T come on, then the problem is probably in the blower motor switch itself. To access this switch, you'll need to remov the vertical console. Remove the ashtray. at the bottom of the ashtray opening/cavity, there are two phillip head screws - remove them and set them aside. This console snaps/clips into place and is simply popped out to gain access to the A/C control module. Using your test light, check for power to the switch (Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, campaigns, illustrations and procedures, etc.) If memory serves, the manual A/C control switch can be purchased separately at any Hyundai Dealership Parts Department.

Just replaced the blower motor on mine it is a real pain to do.Very expensive to have done.Motor is $200.00 at Auto Zone new,25.00 at the bone yard.If you have an electrical tester for dc voltage unplug the connector check center wire to outer wires while turning the fan speed cntrl up and down (+ & -) to see if you have power going to it,If yes you have a bad motor.Keep in mind there is power at outer wires all the time but checked one to another between the three you will only get power when the switch is turned on.I see this was 6 days ago,hope it helps.Blower motors are common problems with Cadillacs.

more than likely....blower motor resistor, normally located next to blower motor passenger
side under dash 2 screws & a plug

Being a Plymouth,I would look at the fan switch in the dash,bet it doesn't look ok !!