18 Colorado BCM problem?

2018 Colorado, the air conditioner clutch won’t kick in, after disconnecting battery it works for a while and then stops. How can I diagnose the BCM?
What scan or diagnostic tool will help on this? Can’t justify 5 grand for a really fancy one, but I would like something that will help
Thanks

Welcome to the forum, there are many scanners that can access bcm info, just do an online search, not crazy expensive.

Thanks, Any you would recommend?

Here's one. https://thinkcarus.com/products/thinkscan-plus-s4#:~:text=The%20THINKSCAN%20PLUS%20S4%20is,Engine %2C%20Transmission%2C%20and%20BCM.

Appreciate your info maybe with this I can figure this thing out!

That looks like a decent scanner for the price.

If it works a while after you reset by disconnecting the battery, I'm wondering if maybe it's somehow heat related. FWIW