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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.
Some models all speeds for the blower run through the resistor.Usually the high speed is just a circuit that runs through the resistor that isnt controlled by the resistor but the circuit can fail on the resistor to where the resistor needs replaced to correct this fault.I dont have the exact diagram info on this model here but this sounds to be the cause here.I have seen the resistor pack fail before needing replaced.This would have to be tested further to be sure.
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One common component to fail and cause the no high speed on the set up that uses a high speed relay is a faulty blower control switch.I have seen the high output circuit melt at the connection to the switch with the switch and connector both needing replaced.If this has not been checked this needs done.
Unfortunately with my info being limited on this model here I will have to open your question up for others to see if they can assist further on this.I hope you can get this resolved with ease.