Heater and A/C not blowing air

1994 CADILLAC DEVILLE
120,000 MILES • 4.9L • V8 • 2WD • AUTOMATIC
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JROCC1994CADDY
  • MEMBER
  • 1 POST
My heater and A/C does not blow any air. temperature is set at 90 degrees. when car is off I can hear a motor that shuts off and on when car isn't even in use.
Feb 4, 2020 at 9:53 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good evening,

I attache a wiring diagram for you to view. Check for power to the blower on the highlighted wire in the diagram. There is a 40 amp fuse that controls the motor.

Let me know what you find.

Roy
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Feb 4, 2020 at 10:16 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,711 POSTS
On these the blower motor speed control module which is attached to the motor goes bad. Just my 2 cents.
Feb 4, 2020 at 11:18 AM
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