I have a 2007 Dutch star it has two air-conditioners on top the rear comes and works fine when I use just one air conditioner I can use with no problem although the front one is soon as I turned it on it blows the circuit Even if the rear air conditioner is not running

SOURCE: rear air conditioner

Hi Moonaw,
Take the vehicle to an expert on AC and ask them to check the gas pressure. If that's ok, then have the evaporator (that's the thing that looks like a small radiator which is the heat exchange unit inside the cabin. also have them check the expansion valve for the rear compartment...The fault must be in that section as the condenser, dryer and compressor are common to both front and rear outputs.

Best regards

Johngee10

SOURCE: air conditioner blows hot air from dash

On most cars when you push a button or slide a lever to change your choice of location where you want the air to blow out louvers move inside the dash to redirect the air to your chosen location. When you switch from heat to AC other louvers move. These louvers are often powered by vacuum lines running from the engine. If one of these louvers is stuck or if you have a vacuum leak in one of the lines it may be causing your problem.

SOURCE: after boost air conditioner started blowing hot air

BLOWING HOT AIR YOU MAY HAVE A RESTRICTION ON THE SYSTEM, OR MAYBE A REAL BAD LEAK THAT UR FREEON IS ALL GONE,

SOURCE: I have a Duo Therm Roof top Camper air conditioner

how old is unit and does it have refrigerant in it

SOURCE: My air conditioner in my 2003 KIA Sedona sometimes works

ITS JUST A COMMON PROBLEM A CONTACTED MY SUPPLIER AND HE FIVED AS ITS ALL A FAULT