Awful sound under the dashboard, blend door actuator?

Tiny
CHAUNBECKHAM1
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 3.5L
  • 6 CYL
  • AUTOMATIC
  • 209,000 MILES
When I turn the heat on in the car, the car has an awful sound under the dashboard that sounds as if the dashboard is going to burst! The cars heater still works, The car does not overheat. Please give me advice on how to fix this problem I am having. I have owned this car for 4yrs now and the only problems I have had in the past is the thermostat replacement twice.
Tuesday, January 27th, 2015 AT 9:43 AM

2 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Does it sound like there is a constant knock that lasts about 15 seconds?
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Tuesday, January 27th, 2015 AT 10:16 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yep, I have seen one of the blend door actuators strip its gears which makes a loud noise, you will need to find which one is making the noise though here are the locations so you can check it out. Check out the images (below). Please let us know what happens.
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Saturday, September 7th, 2024 AT 9:40 AM

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