Hi there
With this code you will have to check the wiring for the low speed blower relay to the fans and from the computer to the relay. It's difficult to estimate a cost because without proper diagnosis there isn't any way to know what is wrong. It should be repaired although if the car isn't overheating it's not a huge problem.
P1624 HYUNDAI - Engine Coolant Blower Motor Relay Low Speed Circuit Malfunction Read more: https://www.autocodes.com/p1624_hyundai.html
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