loose ac air flow when vehicle accelerates

Asked by Sep 11, 2016 at 01:46 PM about the 1997 GMC Jimmy

Question type: Maintenance & Repair

When I step on the gas the air flow out of the ac vents are reduced to almost nothing and it comes out defroster vents top of dash

3 Answers

100,475

Defrost is the default setting when you loose vacuum, so you have a vacuum leak somewhere in the vacuum control systems for the heater/defrost. Make sure the line is not split from the engine to the control head inside the vehicle, if that is good then your going to have to test every vacuum servo motor, supply lines and control valve for a vacuum leak. Yes it can get involved.

70,325

Most likely the vacuum check valve is bad. It's in line at the vacuum hose coming from the engine to the vacuum reserve tank on the driver's side fender. It usually looks like a little black or white disc with a vacuum hose connected to each side of it. HTH. -Jim

19,295

There is a vacuum canister mounted on your hood. It looks like a plastic ball and should have one vacuum line going to it. It helps prevent this

1 of 1 people found this helpful.

Your Answer

Jimmy

Looking for a Used Jimmy in your area?

CarGurus has 19 nationwide Jimmy listings starting at $1,980.

Postal Code:

GMC Jimmy Experts

  • #1
    Andrew Olsen
    Reputation
    300
  • #2
    1oldman
    Reputation
    270
  • #2
    tennisshoes
    Reputation
    270
View All

Related Models For Sale

Used Chevrolet Blazer
21 listings starting at $3,998
Used GMC Sierra 1500
258 Great Deals out of 10,810 listings starting at $2,995
Used Chevrolet Tahoe
8 Great Deals out of 724 listings starting at $4,995
Used GMC Yukon
20 Great Deals out of 972 listings starting at $3,000
Used Ford F-150
526 Great Deals out of 10,140 listings starting at $1,400
Used Jeep Grand Cherokee
90 Great Deals out of 2,802 listings starting at $1,500
Used Jeep Cherokee
104 Great Deals out of 6,712 listings starting at $11,750
Used GMC Sonoma
14 listings starting at $1,988
Used Jeep Wrangler
108 Great Deals out of 1,603 listings starting at $3,995

Used Cars For Sale

2001 GMC Jimmy For Sale
3 listings starting at $1,980

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.