Fan switch failure help!!

[Wkz1gg0a]

Havent been on this fourm in a awhile because I switched to a 2001 CRV i still got the Pathfinder (dad drives it as a DD) The fan switch isnt working on 1-3 but on the 4th level its great. Winter is coming and my father doesnt want to be driving a vehicle with no way of turning on the heat. I checked all fuses and connections it seem that the tabs to switch on is worn. Where can i buy just the switch system or is there a DIY on fixing this problem?
99.5 pathfinder SE limited 13x,xxx miles
Other news i replaced upper and lower trailing arms old ones where so bad they were acutally bent removing was harder then putting it back together. I also got a recall notice for the steering but havent gotten a call yet.

[Towncivilian]

Replace the blower motor resistor. Part # 27150-0W714, found underneath the glove box - no removal of anything necessary, 1 connector and 2 screws and that's it.