When I turn the dial to heat i.e 90 it does not blow hot air

This sounds like you have low engine coolant or the temperature blend door actuator stopped working but to but sure this video and guide can help us fix it.

https://youtu.be/SNRb6pSwYuU

and if the temperature blend door needs replacement here is a guide that can help with diagrams below to show you on your car.

https://www.2carpros.com/articles/replace-blend-door-motor

This guide can help as well

https://www.2carpros.com/articles/car-heater-not-working

Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.

Here are the description and diagnostic procedures. DTC INDICATOR LIGHT I: AN OPEN IN THE AIR MIX CONTROL MOTOR CIRCUIT 1. Disconnect the air mix control motor 5P connector. 2. Disconnect climate control unit connectors A (12P) and B (20P). 3. Check for continuity between following terminals of climate control unit connectors A (12P) and B (20P) and the air mix control motor 5P connector.

Is there continuity? YES -Check for loose wires or poor connections at climate control unit connectors A (12P) and B (20P) and at the air mix control motor 5P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO -Repair any open in the wire(s) between the climate control unit and the air mix control motor.

Thank You for the reply . First time I am trying to repair the car. Would like to learn. Sorry for asking basic questions.
1. WHere are the connectors?
2. How do I check the Continuity?

To test for continuity, you would need an ohmmeter to probe the two ends of a wire that you are checking. The connectors are at the air mix motor and climate control panel.