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Hope new bits were used not s/h. if new parts fitted check the multi plug fittings they have a habit of breaking wires in and around the plug a multi meter is helplul and a can of wurth sabesto 2040 penetrant spray a GOD send for all mechanics.
It will either be the switch or the blower motor. You can test the switch with a volt meter at the blower motor conection and see if the voltage changes with the switch. I do not know what the actual voltage should be, but if you get nothing accept on high the its the switch. Otherwise look towards the blower.
Disconnect connector at blower under pass side of dash.Check for power & ground with the blower switch in the #4 speed (High).Most Likely a blower motor if all 4 speeds are out.If high works but no other speeds,you need a blower resistor.Blower easy to change 3 screws & one connector.hope this helps
Check your blower motor fan speed control switch. They go bad frequently. You could have checked the resistor by jumping the wires to the different terminals to be sure the resistor was good. That pretty much just leaves you will the fan speed control switch. Good luck.
remove the trim panel below the glove box and you will see the blower motor,just to the left of it you will see a 4 wire connector plugged into the case. This is the blower motor resistor,this is what you need to replace.