Blower/vacuum problems

Tiny
JOSHYRACY
  • MEMBER
  • 2006 PONTIAC MONTANA
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 117,000 MILES
Just got the van back from local shop for an A/C evac and fill. Tech says that there may be a vacuum leak as the blower is increasing as you accelerate. He mentioned a vacuum check valve but I don't recall that being on this model. Anything I should be looking for or another place to check?
Tuesday, July 14th, 2020 AT 2:43 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
There is a vacuum check valve but it is for the brake booster not the blower motor. I attached the info for this. Also, I attached the info for the blower motor.

The blower motor is controlled by the HVAC control assembly with a control wire and it runs through a resistor.

If the blower fan is increasing with speed then maybe we have an air leak in the airflow door. I think the best thing would be to get a recording of what the blower is doing and what it sounds like as you pick up speed. Thanks
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Tuesday, July 14th, 2020 AT 3:00 PM

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