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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer, I see that you replaced the resistor and the problem persists and this worries me because it makes me think that the problem may be coming from the air conditioning unit.
It could also be related to the engine thermostat as it works directly with the heating system but the air still coming out at one speed means that it is not receiving the signal to blow stronger air and this means that the unit may have problems.
I hope this info to be helpful, my goal is to give you the best advice i can, I hope to be helpful, if you have any doubt or want to know anything else please do not hesitate to reply back.
Kind regards, Sebastian.