Why is my A/C switching back and forth between upper vents and defrost?

DJJ1

New member
Aug 17, 2012
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Vehicle-1999 Dodge Ram 5.9 liter v8 magnum 1500 Sport
I switched out the A/C evaporater and ever since i did that, my A/C will switch between blowing from the top vents that blow at your face and the defrost vents. Its quiet while switching but when it switches back, it pops somewhat loudly. Ive read forums about how it is usually a vacuum leak so what do you all think? I definetly dont wanna take out the box again because it requires alot of work and mainly due to the cost of getting it vacuumed and recharged
 
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