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2002 Pontiac Grand Am Problem with my Heater

Tiny
LOOTERLISA
  • MEMBER
  • 2002 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 85,667 MILES
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?
Tuesday, November 18th, 2008 AT 11:47 AM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Are you saying, the blower motor doesn't work on speeds 123? Air doesn't come out, floor--panel--defrost?
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Tuesday, November 18th, 2008 AT 1:50 PM
Tiny
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
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Monday, December 1st, 2008 AT 1:07 PM
Tiny
JDL
  • 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.
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Monday, December 1st, 2008 AT 1:59 PM

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