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
158,595

James answered 4 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

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