The X phone from Huawei's Mate 20 line, featuring their 7nm Kirin 980 chipset, a 5,000 mAh battery, and a new cooling system branded "Huawei Supercool." Released in 2018. Model number: EVR-L29.
I highly suggest you get in contact with Huawei’s support and send it in under warranty so they can repair and replace it for you for free. Unfortunately I can’t seem to find any replacement parts aside for the camera for the Mate 20 X, let alone the cooling system.