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

98,515

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.

69,445

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

19,055

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 247 nationwide Jimmy listings starting at $1,900.

ZIP:

GMC Jimmy Experts

  • #1
    Andrew Olsen
    Reputation
    290
  • #2
    tennisshoes
    Reputation
    270
  • #3
    1oldman
    Reputation
    260
View All

Related Models For Sale

Used Chevrolet Blazer
3 Great Deals out of 1,154 listings starting at $950
Used GMC Sierra 1500
782 Great Deals out of 67,756 listings starting at $1,350
Used GMC Envoy
64 Great Deals out of 2,205 listings starting at $1,500
Used GMC Yukon
417 Great Deals out of 20,899 listings starting at $2,000
Used Chevrolet S-10
7 Great Deals out of 1,282 listings starting at $1,800
Used Chevrolet Tahoe
627 Great Deals out of 36,859 listings starting at $1,800
Used Toyota Tacoma
556 Great Deals out of 41,744 listings starting at $2,999
Used Ford F-150
2,131 Great Deals out of 181,877 listings starting at $1,000
Used Ford Explorer
794 Great Deals out of 62,799 listings starting at $1,425
Used Ford Bronco
177 listings
Used Toyota 4Runner
248 Great Deals out of 21,413 listings starting at $2,300
Used GMC Sonoma
5 Great Deals out of 432 listings starting at $1,900

Used Cars For Sale

2001 GMC Jimmy For Sale
73 listings starting at $1,900
2000 GMC Jimmy For Sale
56 listings starting at $2,998

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.