Looking for a protocol to check good health for ac motors

What's next? Auto repair shop. lol You check all the fuses ? How looking at them ? Did you check for battery voltage across the fuses using a voltmeter ? Did you look at a wiring diagram to see what all is involve in making the blower motor work. Just replacing parts is not how to fix the problem.

TechConnect Ep.37 - How To Test A Chevy Blower Motor Resistor (DR775) - YouTube

YOUR FAN FOR THE AC IS NOT WORKING THE FAN HAVE TWO SPEED 1 FOR NORMAL COOLING AND THE OTHER FOR YOUR AC CHECK AC FAN RELAY IS THAT IS GOOD CHECK FAN MOTOR AND ALSO CHECK CONNECTION ON FAN MOTOR

REPLACE THERMOSTAT.IF ALREADY DONE.CHECK HEATER BLOWER MOTOR SEE IF POWER GOING TO HEATER BLOWER MOTOR.IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR CHECK AC AND HEATER CONTROL FUSE AND CHECK BLOWER MOTOR FUSE AND RELAY IF ALL IS GOOD CHECK SEE IF POWER GOING TO AC AND HEATER CONTROL SWITCH IF YES THE AC AND HEATER CONTROL SWITCH COULD BE BAD.

CHECK HEATER AND AC IGNITION 10 AMP FUSE UNDER HOOD JUNCTION BOX.IF ALL IS GOOD CHECK BLOWER MOTOR FUSE AND RELAY.IF ALL LOOKS GOOD. TURN ON CONTROL SWITCH TO CHECK TO SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR FUSE AND RELAY GOOD.YOU HAVE BROKE WIRE BETWEEN SWITCH AND BLOWER MOTOR OR CONTROL SWITCH FAULTY. TO GET TO BLOWER MOTOR ITS LOCATED UNDER THE DASH ON PASSENGER BEHIND GLOVE COMPARTMONT YOU DONT HAVE TO REMOVE GLOVE BOX ITS JUST BELOW IT FAR BACK.YOU NEED TURN OFF RADIO FIRST THEN DISCONNECT NEGATIVE BATTERY CABLE WAIT 20 MINUTES THIS DISABLE AIRBAGS AND THE BCM.REMOVE BLOWER MOTOR HOTWIRE IT TO SEE IF ITS WORKS. IF NO BLOWER MOTOR NO GOOD.IF BLOWER MOTOR GOOD THE AC AND HTR CONTROL SWITCH IS BAD DEALERSHIP FIX.

Barring the simple blown fuse every time my fan has quit working on all my cars it was one of the following. 1 the bearings went bad in the fan and the fan became sticky. you can tell this by rapping on the fan motor itself while it is turned on, if it starts then it is sticky and doesnt have long to live. 2 the motor burned out completely you can tell this by applying 12v from the battery directly to the motors contacts in the proper polarity + to + - to - . If you are not sure how to apply power to a motor to test it you might want to have someone that knows how do it for you. if it doesn't run pretty good sign the motors dead. 3 there is a fault in the wiring and you would use the test for #2 to determine the motor is still good then start checking the wiring and switches. I usually check in the following order, glance at the led embedded in the AC switch on the AC console to make sure the unit has power , rap on the fan housing because its out in the open on the firewall under the hood and im lazy, check the fuses just for the heck of it even though the AC unit LOOKED powered, curse a bit, apply power to the motor to test it. I have only had 1 car with mysterious bad intermittent AC wiring and 1 car with a bad switch the rest were all motors that went bad.

CHECK BLOWER MOTOR FUSE AND RELAY.IF BLOWER MOTOR GOOD STILL BLOWING.CHECK AC COMPRESSOR FUSE AND RELAY.IF COMPRESSOR FUSE AND RELAY GOOD.CHECK AC LOW SIDE PRESSURE SHOULD BE 28 - 30 PSI AND HIGH SIDE PRESSURE SHOULD BE 200 - 220 PSI. IF PRESSURE GOOD THE COMPRESSOR CLUTCH COIL COULD OPEN.CHECK DRIVE BELT MAKE SURE NOT LOOSE AND SLIPPING.

Remove the blower motor resistor and check it over.If it looks like it has a burn spot on it it is bad.Sometimes they will look good and still be bad.this is a common problem with blower not working.Before removing the resistor try tapping on the blower motor.If it starts to work then it is the blower motor itself.Also check fuse.They are under the hood and on the side of the instrument panel.Good luck.

IF ALL WINDOWS ARE NOT WORKING IT LOOKS LIKE.THE POWER WINDOW CIRCUIT BREAKER IS BLOWN.CHECK THE HEATER AND AC IGNITION FUSE.MAKE SURE POWER IS AT THE SWITCH.IF ALL IS GOOD.CHECK BLOWER MOTOR FUSE AND RELAY.IF THEY ARE GOOD.HOT WIRE BLOWER MOTOR IF IT WORK YOU HAVE A BAD BLOWER MOTOR SWITCH AND RESISTOR.IF BLOWER MOTOR DONT WORK.REPLACE BLOWER MOTOR.

Either radiator fan switch or AC system fan activate relay. Check fan switch or look for AC fan motor fuse. Wiring diagram would help.

R u sure u tested it correctly? There will be a 30 amp fuse usually associated with the blower motor however u need to look at the motor connections with a meter set to ac. These newer cars use a pwm type drive which is a pulsating dc voltage similiar to ac and should vary in amplitude as u turn ur control for speed. If u have that then ur motor is bad and has to be replaced.