Model: grand caravan
Engine Size: 3.3
Refrigerant Type: 134a
Have a dodge caravan with a/c always on and not cycling off but no cool air . I do have rear a/c in vehicle and a hissing sound is heard while a/c is on. Before this i tried to add some refrigerant thinking it may be low. A/C was ok at that time but not very cold. Now it just blows no cool air . Is it possible that i overfilled the system or do i need to take it to shop to get them to fix it?
Need some low and high side pressure readings!
I've heard the "hissing" noise is from the TXV receiving refrigernat vapor as an input (when it should be receiving liquid refrigerant), and is commonly attributed to a low refrigerant level. Could air in the lines have the same effect? I wonder if you got air in the system when you tried to put in the refrigerant. But by all means, low/high side pressures at a given ambient temperature would be helpful.
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