I have a 05 mustang that has some type of leak in the system. When it’s charged it’s cold and blows great but over time, I wanna say about a month, it gets warm. I’ve done dye and sniffer tests in the engine bay and nothing showed up. I’m looking to see if anyone has had a hose or grommet under the dash go bad and where I can find a diagram of it? I live in florida so no ac kinda sucks lol. Heat works perfectly no matter what, but the Freon eventually disappears.

 

Both high and low Schrader valves free of leaks? That is the most common area for most cars.When you take off the cap, you get a slight hiss? You can fill the neck of the valve up with something like brake clearer and look for air bubbles. Bubbles = leak.