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A bang noise when my hvac start

When my AC start, it make very loud noise, help me please

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  • 39 Answers

Is it only when you use the AC? does the AC work? if so, sounds like the compressor is going out... or it could be the belt tensioner is weak

Posted on Nov 14, 2014

Testimonial: "sorry for wrong place, I talk about my HVAC , and the unit was grand new, thanks for your time"

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Posted on Jan 02, 2017

WhiteRussian
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SOURCE: loud banging noise

If the noise sounds like a diesel engine, knocking until the engine warms up, more than likely it's one of the rods/rod bearing. Unfortunately, if that is the case the engine is running on borrowed time. You'll be lucky if you get 2000 miles before total engine failure; I wouldn't recommend taking it on any long trips.
It would need to be serviced by a professional, they need to check the rods, rocker arms, lifters, and the timing chain for the cause.

Posted on Mar 12, 2009

  • 366 Answers

SOURCE: new starter loud banging noise when u start it

could be! can be cracked,could have damaged drive gear tooth on it! could be starter that became loose also! inspect it asap before damaging new starter or fly wheel!

Posted on Apr 18, 2009

emissionwiz
  • 75797 Answers

SOURCE: Rear HVAC unit in 2002 trailblazer making loud poping noise and then quits after a couple of minutes

The only thing i can think this would be is a blower motor noise, have shop take a listen is my best advice.

Posted on Oct 26, 2012

Testimonial: "Thanks for getting me the correct name so I can get parts. "

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