My 04 Tahoe LT started blowing hot air front and back. When I added freon I noticed a lot of condensation coming from rear evaporator area. Almost like a hose was turned on. Freon gauge said 50 psi and went back to 30 psi until I turned rear ac off. Is it possible to lose that much freon from system that fast due to leak? After 3 days it blows hot air again front and back.