A year ago, I had replaced everything else in the AC system. 2004 cadillac escalade with 5.3 . The pressure relief valve kept popping off no matter the amount of refrigerant I had put in. I found that it could be the AC expansion valve in the rear. So I picked one up from RockAuto.com part #GDP3411431
Also, I finally found a way to put in a cabin air filter . Now I get ti star chasing down the ground problem in the wire harness. Whish me luck.
Cabin Air Filter Cover 22759208 Compatible with Select Cadillac - Chevrolet - GMC Models 259-100 https://a.co/d/fz5Q37y