Good morning people, I would be in need of help, I have a refrigerator with frezzer, the client tells me that the bottom does not cool well, I try the compression of the engine and it arrives in 9 seconds at 500 psi but the needle immediately becomes up to 250 at 300 psi, I did the test to repeat the same step 3 times and the engine does not want to start, (it's like it costs to start again), if someone can help me I will thank you

Comment if the evaporator freezes completely luck