Hi and thanks for using 2CarPros.com.
Since you have already replaced the two components that are common problems, I need to know if you replaced the blower motor relay. I have attached a wiring schematic for you to review. If the relay can't handle the load, it may be turning off.
Here is a link which describes how to test a relay:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
There are five pictures attached. The first is simply the relay location, and the others are the schematic from the relay directly to the blower motor and the entire wiring schematic for this system. They fall together in the order I have attached them. Take a look and let me know if you have questions.
I hope this helps. Let me know if you have other questions or need additional help.
Cheers,
Joe
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Thursday, July 26th, 2018 AT 8:17 PM