It sounds like the A/C amplifier or the IPDM is going out. When they checked the system, did they do a CAN scan to help determine the problem? You are right, the chances of two parts being bad is pretty remote. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.
here is a video to show you how:
https://youtu.be/u-4syLc-ifQ
Here are the HVAC system wiring diagrams so you can see how the system works. Also, we need to know if the system fuses have power, this guide can help, and you can use the wiring diagrams to see which fuses (12 of them) need to be checked.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Here is the A/C amplifier location and how to replace the IPDM in case codes come up for them. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
Images (Click to make bigger)
SPONSORED LINKS
Saturday, July 8th, 2023 AT 12:16 PM