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

116,295

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.

79,215

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

21,905

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 people found this helpful.

Your Answer:

Jimmy

Looking for a Used Jimmy in your area?

CarGurus has 17 nationwide Jimmy listings and the tools to find you a great deal.

Postal Code:

GMC Jimmy Experts

  • #1
    tennisshoes
    Reputation
    330
  • #1
    Andrew Olsen
    Reputation
    330
  • #3
    1oldman
    Reputation
    280
View All

Related Models For Sale

Used Chevrolet Blazer
16 listings
Used GMC Sierra 1500
84 Great Deals out of 11,002 listings starting at $3,880
Used Chevrolet Tahoe
13 Great Deals out of 892 listings starting at $7,979
Used GMC Yukon
12 Great Deals out of 1,113 listings starting at $3,995
Used Toyota 4Runner
16 Great Deals out of 540 listings starting at $4,995
Used GMC Envoy
31 listings starting at $1,888
Used Chevrolet S-10
7 listings starting at $2,450
Used Jeep Grand Cherokee
71 Great Deals out of 5,022 listings starting at $3,290
Used Jeep Wrangler
16 Great Deals out of 2,014 listings starting at $6,900
Used Ford Mustang
22 Great Deals out of 1,293 listings starting at $2,995
Used Chevrolet Camaro
8 Great Deals out of 1,031 listings starting at $4,500

Used Cars For Sale

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.