About Tom Joy Expertise Have expertise from 1960 thru 1999 CADILLAC'S in carb, fuel injection, brakes, suspension, CHECK ENGINE lights, ignition, transmission, A/C and heating, Electrical problems and all electronic components. if maxed out you can contact me at: tomcjoy@msn.com.
Expert: Tom Joy Date: 9/3/2007 Subject: 96 AC BLOWER INOPERATIVE
Question HAVE A 1996 SEDAN DEVILLE,CAB BLOWER FAN WON'T WORK,BLOWER MOTOR HAS 12V ON TERMINAL C AND A GOOD GROUND ON TERMINAL A. TERMINAL B STAYS AT A CONSTANT 12V REGARDLESS WHAT SPEED THE FAN IS SET ON.I HAVE TWO CODES IN SYSTEM PO603 AND AC1347 THAT IS CURRENT.THE PROGRAMMER WAS REPLACED ABOUT 5 YEARS AGO.
THANKS IN ADVANCE FOR YOUR HELP, EDDIE
Answer Replace the blower motor.
NOTE: whenever you replace the blower motor you should also replace the ACM as the motor tends to wear out the internal brushes and puts a heavy amperage draw against the ACM and burns out the diodes.
You can try a blower motor FIRST and see if it works.
