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Fan motor runs only on high speed

Tiny
LARRY 1
  • MEMBER
  • 2003 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 99,000 MILES
I have replaced resistor. Fan motor does not work on speeds 1-4 and is also affecting the day-time running lights. Checked all fuses and circuits. All good Checked ground-no problems This is on a 2003 Pontiac grand Prix Could you help?
Sunday, May 22nd, 2011 AT 6:19 PM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you use a voltage tester anywhere? Check voltage at the applicable fuse/s.

In the diagram, when the relay is energized, only high speed. When relay isn't energized, continuity for lower speeds. At the blower motor, terminal A is voltage, terminal B is ground.
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Sunday, May 22nd, 2011 AT 6:36 PM
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hello,

The Blower Motor Resistor is famous for this problem you are having. It is mounted in the duct work under the passenger dash near Blower Motor.
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Sunday, May 22nd, 2011 AT 10:17 PM

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