When we turn on the air conditioning we get no blower but the compressor is working alright, I think it might be in a vacuum switching device but dont know where it is located so that I can check the hoses? I have also noticed that the vacuum break booster is weak so that tells me that there must be a leak all I need is to have a diagram as to where the vacuum switch is located or an explanation to how to go about getting to it. Thanks.

Air Conditioning problem
2004 Chevrolet Impala


Ac is not blowing out cold air. You have to put gages on the system and it shows its has freon.Checked all fuses and relays. The two fans in engingine compartment do not come on when the ac is turned on but does when the engine gets hot. The compressor engages when turned on also.
If the magnetic clutch engages the compressor and still no cold air could be still low in freon or the HVAC unit.

Blower motor not working all the time...if I bang the dash near the glove box, it comes on then works great. Is this the switch assembly, the resistor problem, or should I be replacing the blower motor?

The problem is the blower motor speed control resistor, it is located near the blower motor in the housing. I exchanged mine and it works like a charm now.

If the freon is full and the compressor clutch is working,is the blower working, need more details, if it is, you could have a blocked orifice filter. or a bad high pressure switch located at the rear of the compressor.if the high pressure switch loses voltage or goes out, your cool air will come to a dead halt. check the high pressure switch for voltage. good luck!

If you are absolutely confident the AC compressor is not kicking out on low pressure then it is the blend door actuator.

The blend door determines how much air blows through the heater core or evaporator.

The actuator can be purchased at dealer and maybe at a local part store.

i just switched out my compressor today after over a year of my air doing this until it finally went out....(it only blew hot air). Replacing the compressor seemed to work. it is pricey though. dealership charges and arm and a leg. (i think the quoted the compressor at like 1000 not including labor.) my knobs are also messing up, but the one that switched from regular air to defrost. they only sell the knobs in a pack of 3 and are charging 300 for that....but i say good luck!!! its pricey...they shoulda recalled the cars. this is a very common problem i have been seeing. all they wanna do is make money off of it.
anyways the new compressor seems to be working.

There are doors that open and shut to move the air from one place to another. One may be stuck or the motor or vacuum relay is not working. You will need to pull of all the covers over your system where the vent doors are located and check the little doors for being stuck or not moving when you activate each switch.

Blowing out of the defrost is a vacuum problem. You have a leak between the motor and the heater controls. Most likely needs to have the A/C system charged up.

ok could be one of 3 things. 1 you may be out of freon. (proly spelt that wrong) 2. compresser could be bad. 3 the clutch on your compresser might not be engaging. when trucks running turn ac on and see if the front of your compresser spins or not. if it does clutch is good. but it could be that your compresser is still bad. either way i recomend you go for freon and start there. when they fill it they will tell you for sure wether or not your compresser is bad.

Check the plenum door motors (vacuum controllers). When you move control you should see each of them move. the one that does not respond is the one that isn't working. Check hose that feeds it as well if no vacuum there switch control is bad.)

Sounds like a bad switch.