Ac blower will not run while ac is turn on but run by itsself

If your car has HVAC where you set a temp (like 75) this is the automatic unit. The blower controller often fails and the blower will continue to run after the car is turned off.

Sounds like they jumpered a relay and did not put it back correctly.
Have you taken it back to the shop ?

you should make a diagnostic to know what happened to your car
of course you need an auto diagnostic tool : http://www.chinasnoy.comand you can find all kinds of tools in chinasinoy.com

Are you sure it is the AC blower? a lot of modern cars have a temperature controlled radiator fan, this can run when the engine is very hot , even when the keys are removed. It is a safety feature to protect your engine.

Try this. When the blower is not working open the hood. Locate the blower on the passenger side near the firewall. Most likely it is covered with a thin rubber piece but it may not be. Turn the key to the run position. The engine does not need to be running. Turn the blower speed switch to high. Tap the blower with the handle end of a large screw driver. If the blower starts to work replace it.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

First check the 15 amp HVAC fuse located in the main fuse block inside the car on the passenger side of the center console, under a cover. If the fuse is good, then the problem may either be the HVAC blower switch (which is the fan blower selector switch), the fan blower motor resistor, or the fan blower motor. An auto repair manual will explain and illustrate for you the steps on how to check each of these components.

Even after pushing the ac light switch on, the fan blower selector switch has to be turned on as well (working) because it provides an electrical path to the positive side of the battery to complete the circuit and turn the ac light on. What the ac light switch does is provide the electrical path for the ac compressor clutch to come on through the ac control relay which is controlled by the car's PCM(computer) when you want ac, but the ac light switch still needs to run through the fan blower selector switch to receive its power. You can turn on the fan without the ac light switch because it gets its ground path(negative) from the blower motor. So the blower motor has to work in order to provide a ground path for the fan blower selector switch to be functional. You could have a faulty blower motor which is why no air blows through the vents. The fan blower motor is located inside the car on the passenger side underneath the dash at the bottom end of the glove compartment box. You'll see it. It's right above where a person rests their feet on the floor. Therefore, if your 15 amp HVAC fuse is good, check to see if you have voltage at the blower motor connector. Unclip the connector and with the ignition on and the fan blower switch moved to any one of the first 3 selections, check for voltage using a multimeter. The voltage will vary because there is a blower motor resistor. Voltage should be higher on setting 3 than 1. If you do have voltage at the blower motor connector, check for a faulty blower motor. The auto repair manual will tell you how to do it using jumper wires.

It's normal that your car is running hot because the radiator fan works in conjunction with your ac compressor. If the ac is on, the radiator fan will be on and therefore the engine coolant temperature will stay in it's normal operating range. If the ac is off, the radiator fan will stay off as well and the engine coolant temperature gauge will begin to rise and show pretty hot (especially at idle). It will do this up until a certain degree then the radiator fan should turn on thermostatically and stabilize the temperature. It's scary and I know what your saying because it does that to my car if my ac isn't on. Don't worry it won't overheat.

Can you hear the blower fan running? It sounds like the blower just died.

~Brandon

A new blower motor resistor

You have clean the blower unit , may be its dirty then . and then check the blower resistor unit for malfunction.

Hi Phillip,

Check your thermostat wires to see if you have any of them which are bare and touching. If any are touching separate them and tape em up and try unit again. You have a direst short in your cooling portion of the unit.