Automotive Air Conditioning Information Forum

As stated, the system holds vacuum for a couple of hours. I charged it to 55psi before turning on the compressor and it'll hold. As soon as I engage the compressor, it does an instant dump. I shoot another can while it's running and watch the pressure come up and when I stop charging, it just drops to zero. I've shot dye in the system and can't find a leak. The compressor is clean where you'd normally see evidence of a leaking seal. I bought an electronic sniffer. It shows negative around the condenser(which is new), compressor and all connections, which have new seals. Just for the heck of it, I put the sniffer into my vents. It chirped. Is it possible for the evaporator to have such a massive leak? Why does it only leak when the compressor is running??

2007 Nissan Frontier
2024- new expansion valve, seals, dryer, pressure sensor. Blew 42dgrs
2025- new condenser, new seals. Massive leak

Evaps are famous for leaks. It leaks when the comp is running because of the increased pressure.

tbirdtbird wrote: Sun May 18, 2025 9:02 am Evaps are famous for leaks. It leaks when the comp is running because of the increased pressure.

Disclaimer: I'm NOT an AC professional

Wouldn't an evaporator have about 30psi pressure while compressor is engaged and static pressure of maybe 90psi when not engaged???

Cusser, that makes sense what you said.
After pondering this, I have to wonder if the TXV is stuck open, thus allowing the evap to see high side pressure

Seems to me that the leak is somewhere in the (new) condenser, or in one of the joints, because the system didn't have a massive leak last year.