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1. Remove the under-dash panel on the passenger side

2. Remove the blower motor (this allows easier access to the resistor assembly)

3. Disconnect plug from blower motor assembly, and disconnect plug from blower motor resistor assembly

4. Remove resistor assembly screw closest to you, and undo 2 screws closest to firewall (it is not necessary to remove these, as the resistor assembly has slots, not holes, for these screws to pass through. This allows you to tilt the closest edge of the resistor assembly downwards and remove the resistor assembly.

5. Install the new resistor assembly, and reverse the above steps.

*screws have 6mm hex head - I used a socket and small ratchet (1/4 drive) to do the job - it worked well.