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When I turn the truck off I here a hissing sound?

Tiny
DMACK1
  • MEMBER
  • 2004 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
The air is cold driving in the city and turn hot when on the highway. When I turn the truck off I here a hissing sound. What could causes this?
Tuesday, July 26th, 2011 AT 8:13 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
O.K. Not expansion valve but fan clutch is the problem. When engine cold fan will turn easy at op temp fan should be hard to tuen by hand. Check out and replace
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Thursday, May 13th, 2021 AT 12:20 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
P.S. If fan clutch checks out need guage readings
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Thursday, May 13th, 2021 AT 12:20 PM
Tiny
DMACK1
  • MEMBER
  • 2 POSTS
Fan clutch is easy to turn. It will not let me connect the gage, and freon comes out.
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Thursday, May 13th, 2021 AT 12:20 PM

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