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Heater and A/C not blowing air

Tiny
JROCC1994CADDY
  • MEMBER
  • 1994 CADILLAC DEVILLE
  • 4.9L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
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.
Tuesday, February 4th, 2020 AT 5:53 PM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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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Tuesday, February 4th, 2020 AT 6:16 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
On these the blower motor speed control module which is attached to the motor goes bad. Just my 2 cents.
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Tuesday, February 4th, 2020 AT 7:18 PM

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