2002 Pontiac Grand Am Problem with my Heater

2002 PONTIAC GRAND AM
85,667 MILES • 4 CYL • FWD • AUTOMATIC
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LOOTERLISA
  • MEMBER
  • 2 POSTS
My heater has 5 settings. When I put the setting on 1,2,or 3 it makes a pumping or pulsating noise and no heat comes out. However the heat does work on setting 4 and 5. Is this the water pump?
Nov 18, 2008 at 3:47 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Are you saying, the blower motor doesn't work on speeds 123? Air doesn't come out, floor--panel--defrost?
Nov 18, 2008 at 5:50 AM
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LOOTERLISA
  • MEMBER
  • 2 POSTS
yes the blower does not seem to work on setting1 2 or 3 but heat comes out on 4&5 defrost, at feet, and out of the panel
Dec 1, 2008 at 5:07 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
If your going to trouble shoot this yourself, you might try testing at the blower resistor. Yellow wire is low speed, tan wire the next, lite blue the third speed up. Just turn on hvac controls, you need to turn on the key, set the blower motor speed control to one of the three lower speeds, check the appropriate colored wire at the resistor, for voltage. If no voltage, backtrack to the blower motor speed switch at the hvac control panel.
Dec 1, 2008 at 5:59 AM
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