Engine hissing noise

Asked by Guru3QNBH Jul 11, 2020 at 03:46 PM about the 2001 GMC Sierra 2500HD

Question type: Maintenance & Repair

Hello,


I have a 01 GMC Sierra 2500 with the 8.1 liter V8. Did some driving in 90
degree weather, After shutting the engine off I heard a hissing sound coming
from the engine for a few seconds after shutting the motor of. AC was running
while I was driving no problems with overheating engine temp is normal didn’t
see any leaking coming from the engine bay or under the motor. Heating and
cooling work fine. Low mile motor with 47,000 original miles.

Wanting to make sure this is normal and not something worry about having
looked at thanks.

1 Answer
155,255

james answered 3 years ago

Most likely what you heard was refrigerant boiling in the air conditioning system. Perfectly normal. Sometimes you can hear it in the dash, inside of the vehicle too. Hope that helps! Jim

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • Engine hissing noise 1 Answer

    Hello, I have a 01 GMC Sierra 2500 with the 8.1 liter V8. Did some driving in 90 degree weather, After shutting the engine off I heard a hissing sound coming from the engine for a few seconds afte...

    2001 GMC Sierra 2500HD

    -

    Maintenance & Repair

  • Whooping noise 3 Answers

    Hello, Just recently a new noise began on my GMC 2500hd 6.6 duramaxx. Every time I get between 15 and 20 mph there is a whooping noise (seems to be around the front wheels). It's a pulsating patt...

    2014 GMC Sierra 2500HD SLE Crew Cab LB 4WD

    -

    Maintenance & Repair

  • Engine not starting / and other weird symptoms 1 Answer

    Hi there, the truck in question hadn't been started in two or three weeks because we haven't gone anywhere. Here's what happened when I tried to start it two days ago. 1) It sounded like the engine...

    2016 GMC Sierra 2500HD

    -

    Maintenance & Repair

  • 89 gmc sierra 2500 5.7 the check engine light blinks rapidly with the engine running or not. What does it mean? 1 Answer

    Have replaced plugs, wires, dist cap and rotor, and the pcv valve. Valves clatter on acceleration. Check engine light flashes continuously when ignition is on with engine running or not

    GMC Sierra 2500HD

    -

    Maintenance & Repair

  • 10 mpg with new Jasper engine & transmission 3 Answers

    1993 GMC Sierra runs rich. ALL components new and I mean everything, Jasper 5.7 engine and transmission. I have talked to several full time mechanics and nobody has an answer?????

    2001 GMC Sierra 2500HD 2 Dr SL 4WD Standard Cab LB HD

    -

    Maintenance & Repair

Own this car?

Share your experience with others.

2001 GMC Sierra 2500HD

Write a car review

Review another car

Shortcuts

Search GMC Sierra 2500HD Questions

CarGurus Experts

  • #1
    Gilbert Tijerina
    Reputation
    490
  • #2
    BoholMark
    Reputation
    460
  • #3
    Marcus Victorius
    Reputation
    410
View All

Know more, shop wisely

Search

Related Models For Sale

Used Chevrolet Silverado 2500HD
1,071 Great Deals out of 30,722 listings starting at $1,350
Used GMC Sierra 1500
1,885 Great Deals out of 66,340 listings starting at $875
Used Ford F-250 Super Duty
1,430 Great Deals out of 42,306 listings starting at $2,000
Used Chevrolet Silverado 1500
4,206 Great Deals out of 131,277 listings starting at $1,000
Used Ford F-150
6,148 Great Deals out of 132,487 listings starting at $900
Used Dodge RAM 2500
70 Great Deals out of 1,096 listings starting at $3,500
Used Toyota Tundra
1,084 Great Deals out of 32,424 listings starting at $2,650
Used Ford F-350 Super Duty
950 Great Deals out of 22,684 listings starting at $3,400
Used GMC Yukon
655 Great Deals out of 11,433 listings starting at $2,444

Used Cars for Sale

2024 GMC Sierra 2500HD For Sale
89 Great Deals out of 14,810 listings starting at $40,370
2023 GMC Sierra 2500HD For Sale
59 Great Deals out of 770 listings starting at $40,684
2022 GMC Sierra 2500HD For Sale
85 Great Deals out of 950 listings starting at $32,500
2021 GMC Sierra 2500HD For Sale
64 Great Deals out of 679 listings starting at $28,995
2020 GMC Sierra 2500HD For Sale
52 Great Deals out of 733 listings starting at $26,887

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. Content will be removed if CarGurus becomes aware that it violates our policies.