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The first thing to do would be go to your local auto parts store and buy an air conditioning recharge kit. Provided your vehicle isn't too old, they sell recharge kits that require no tools.
If their is a leak anywhere while you recharge, you will know.
Try recharging the air conditioning first, it is very simple and the kits come with simple instructions.
If there are no leaks, your A\C will blow cold air again. As for the pressure, if it continues to slightly blow air you may be looking at a new air compressor unit or a vaccum line. A new unit will run you anywhere from $200-$2000 dollars plus labor depending on the vehicle.
If the recharge works, at least you will have slightly blowing cold air rather than hot and you can continue that way until the unit fails.
1.)If your System is OVERCHARGED this Will Occure due to the EVAPERATOR FREEZING UP
2.) Also if your HVAC Control Modual is Malfunctioning this will Aslo Cause this Condition, It Controls the BLEND DOORS that OPEN for COLD or HOT AIR Look Into these Items and Also Look Into wethrt the A/C Compressor Cycles OFF when it GETS OFF this Will POINT at the HVAC CONTROLER if it Cycles Off When Set For A/C or COLD Air
this may be due to a few things, it may be a bad blend door actuator, this is the motor that turns the door to give hot or cold air, the next thing is maybe compressor connection is loose or the system is low on gas. start the car and see if the compressor clutch kicks in then if it does try turning the temp control to hot then cold and see if that works maybe the blend door is stuck,
The pulley on the air condition has to turn it has a belt on it. The Compressor engages to pre cool the evaporator. Most likely you have a blend door pod leak or leak in the hose or the sampler valve is bad. I would replace the sampling valve behind the glove box/air bag. As that reads the cabin temp and if it thinks the car is cold the heat will stay on because everything is automatic. All vents will blow cold when it thinks its hot and in addition to floor and corner dash center vents will blow cold when it works. If the direction of air is correct then the A/C system may have a leak or need a charge of freon.
is the compressor turning on? when you turn thwe a/c? on,
and also locate the low side line on engine compartment and feel if is cold, if it is, then your blend door system is not working,
the blend door does control the cold and hot air coming to engine.