Off Noise Sport Track 07 V8

[haitises]

Greetings to all from the Caribbean. I recently bought a 07 Limited and notice it has a hissing noise that goes along with the acceleration of the truck. It reminds me of my dad's old Galaxy 500 when there the steering wheel fluid was low. I ckd all fluids and everything seemed fine. Any ideas? Also, down here need to use a lot the recycle feature on the a/c but it still pulls in all the back smoke from trucks. Is that normal. I had a Korean diesel SUV and in recycle it really shut out the outside air. Thanks for any help and great site.

 

[bender]

most likely a vacuum issue with the HVAC, lots of threads on here, doesnt matter if a/c or heat is on or off, try going up a long gradual grade and see if the air goes from the vents to the dash. i have not been able to get it properly corrected. some have had luck with various parts, i have not.

 

[haitises]

Bender you are talking about the faulty recycled air with the a/c right?