The problem is my car failed inspection due to the defroster not working the heat and AC work but when i turn the heat up to 4 it cuts off compleatly 1 2 and 3 work fine but the 4 defrost makes no noise and does not work and how much should the problem cost me?
Defroster on 1997 Hyundai Elantra
Defroster not working on 4 is a classic symptom of a faulty heater blower resistor. Check and replace that and you will likely have your blower speeds back. Furthermore, please check your wiring connector at the resistor to make sure there is not any melted terminals or wiring issues.