Blower motor resistor connector wireing diagram

Tiny
CHASER1234
  • MEMBER
  • 1997 CADILLAC EL DORADO
  • 4.6L
  • V8
  • FWD
  • AUTOMATIC
  • 150,000 MILES
My girlfriends ac stoped working when I jiggled the connections to blower motor I came on so I baught a new connector which wires go where
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Saturday, April 11th, 2015 AT 6:21 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
Normally we shine up the male terminals with sandpaper and use a pick to squeeze the female terminals tighter. If you want to replace the connector, there's only two wires to cut and splice. Go according to the colors if they're the same. If they're different, go according to their locations in the plug.
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Sunday, April 12th, 2015 AT 12:01 AM
Tiny
CHASER1234
  • MEMBER
We had just replaced the blower motor 3 mo ago I was also told that it could as well be the resistor! But when I wacthed resistor problems on YouTube I seen that the a/c was working just in the high speed mode dose that car also have a blower motor under passenger dash because I've only changed the 3 bolt blower located in engine bay on firewall thank u so much for your time
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Sunday, April 12th, 2015 AT 2:00 AM
Tiny
CARADIODOC
  • EXPERT
I'm not sure where the parts live on that car. Usually the blower motor and resistor are in the heater box under the dash, but GM does put them on the firewall sometimes.

Is it the motor or the resistor you're working on? The most common failure is a blower that only works on the highest speed. That is caused by a tight motor that draws excessive current as a result, and that overloads a thermal fuse built into the resistor assembly. With that thermal fuse burned open, all the speeds related to the assembly are dead. The highest speed bypasses that resistor so it still works.

When all the speeds still work, the resistor and its fuse are still okay, but if the motor is drawing high current, or when people use the heater on the higher fan settings a lot, that high current starts to take its toll on the connectors. As they slowly degrade, a little resistance develops, and that results in heat build-up. That heat further weakens the connection, and that causes more resistance. Eventually you reach the point where the terminals get so hot, the plastic connector body melts.

When it hasn't gotten that far yet, that's when it's okay to clean and tighten the mating terminals.
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Sunday, April 12th, 2015 AT 2:18 AM

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