1977 Cadillac Deville

1977 CADILLAC DEVILLE
46,000 MILES • V8 • 2WD • AUTOMATIC
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UPUTAT
  • MEMBER
  • 1 POST
the heater blower motor stopped working in my 1977 cadillac.there is no current going to the motor.if you jump it the motor runs .must be a common problem.my 86 caddy has same problem.
Feb 6, 2010 at 6:25 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Could be the blower motor relay or the blower control switch
Feb 6, 2010 at 6:30 AM
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ELLIOT ECKSTEIN
  • MEMBER
  • 3 POSTS
Where is the relay. Dose the relay run anything else
Mar 10, 2017 at 8:59 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
unfortunately we don't list anything for that model year as far as relays. you might check inline fuse behind alternator and on top of heater box under h ood is usually where it was put back then.
Mar 10, 2017 at 10:31 PM
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ELLIOT ECKSTEIN
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  • 3 POSTS
Nope it doesn't have anything there
Mar 10, 2017 at 10:57 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
it may not have a relay I forgot it s' been so long.it may be the resistor is burnt up as well which should have a 4/5 way plug and on heater core under hood. I'm not really sure a relay was used then.
Mar 10, 2017 at 11:53 PM
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ELLIOT ECKSTEIN
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  • 3 POSTS
This is where i looked
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Mar 11, 2017 at 12:08 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
the single arrow points to the resistor take that out and see if any part of it is broken that controls all your speeds then where the double arrow is follow that line it may lead to the relay if there is one. However that is auto temp control so there may be something else wrong. also on the resistor the wiring used to burn off right at the resistor which would not allow blower to work it would do the same at switch in dash.
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Mar 11, 2017 at 1:53 AM
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