This could be a number of things. First we need to make sure the blower works so just jump 12 volts to it and make sure it works. If not then fan needs to be replaced.
If it does then we have a relay issue or fuse issue. Here is a guide that will help with this:
https://www.2carpros.com/articles/low-or-no-air-flow-from-vents
I am attaching the wiring diagrams below for testing to see what the issue is.
Also, here is a guide that will help with testing a relay if you have to do that:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Lastly here is a guide if the blower motor needs to be replaced:
https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only
Let us know if you need other info. Thanks
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Thursday, December 24th, 2020 AT 6:28 PM