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Problem With Defroster/air Conditioner?


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#1 Z71Silverado

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Posted 25 October 2011 - 09:13 PM

Hey. I know driving with the air on decreases horsepower but does driving with the defroster on also decrease horsepower? i thinki will have an eventual problem. when the air conditioner is on there is a noise that sounds like a snake hissing when it's running, the same noise also happens when i turned the defroster on. There is a huge difference in get up and go with either the air or defrost on. is that normal? what could be making that noise? the air compressor?

Edited by Z71Silverado, 25 October 2011 - 09:15 PM.

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#2 dewfpo

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Posted 25 October 2011 - 11:52 PM

Yes it's normal. In DEFROST mode the air conditioning compressor comes on to dehumidify the air and clear the windshield faster.

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#3 Z71Silverado

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Posted 26 October 2011 - 12:02 PM

Is there a way to set up the truck so that the compressor doesn't kick on with the defroster? I only use the defroster when it's cold so I see no reason for compressor to kick on.

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#4 txab

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Posted 26 October 2011 - 12:26 PM

By running the compressor you're accomplishing at least 2 things:

1. Removing moisture from the air which aids in defrosting.
2. Allows seals in the AC system to be lubricated by the circulation of refrigerant and oil

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#5 Z71Silverado

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Posted 26 October 2011 - 01:16 PM

Well what do you guys think the hissing sound is? it only happens when i turn the air or defrost on.

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#6 Patch6713

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Posted 26 October 2011 - 01:47 PM

Well what do you guys think the hissing sound is? it only happens when i turn the air or defrost on.



I also have had the same noise. I don't think it is coming from the compressor, I think it is coming from the drier? near the firewall.
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#7 Z71Silverado

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Posted 26 October 2011 - 03:20 PM

Well what do you guys think the hissing sound is? it only happens when i turn the air or defrost on.



I also have had the same noise. I don't think it is coming from the compressor, I think it is coming from the drier? near the firewall.


what was the problem? and what did you do to fix it?

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#8 Z71Silverado

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Posted 26 October 2011 - 03:21 PM




Edited by Z71Silverado, 26 October 2011 - 03:21 PM.

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#9 Patch6713

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Posted 26 October 2011 - 04:35 PM

Well what do you guys think the hissing sound is? it only happens when i turn the air or defrost on.



I also have had the same noise. I don't think it is coming from the compressor, I think it is coming from the drier? near the firewall.


what was the problem? and what did you do to fix it?


I haven't done anything yet. Been waiting to see if anybody else has been having the same problem and seeing what they do. Since the A/C and heat still work and since my local mechanic (doesn't do A/C work but I believe knows his stuff) said there is nothing there that can do any damage he said to leave it. Since it hasn't bothered me lately I haven't really looked anymore into getting it fixed. However, in my case it got worse when I had my snowplow on and since we are getting into that season I might end up being bothered by it enough to get it worked on.
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2005 GMC Sierra 2500HD WT ECSB.
Factory mud flaps, Owens running boards, Recon LED cab lights, Back Rack, Cooper Discoverer A/T3's, vent-visors, SLE rear bumper, remote start, LINE-X bed liner, 1" crank of the torsion bars, 6000K HID Xenon Headlights, LED under tailgate light bar, fog lights, various blue and yellow lights, 8' Fisher MinuteMount2

1998 VW Jetta TDI - run around car

#10 mxeightyeight

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Posted 26 October 2011 - 06:04 PM

My truck has made that hissing noise from day 1. It will only do it on lower fan settings like 1 or 2. I don't really worry about it. My father-in-law has a 2001 and his does not make that noise. Strange.

#11 1990ss

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Posted 26 October 2011 - 07:22 PM

I have the same noise on my '06. My '00, '01, or '02 didn't do it though.
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#12 u118224

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Posted 27 October 2011 - 11:06 AM

I also have the hissing noise on my '04 Suburban. It's been that way since I bought it.

#13 mxeightyeight

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Posted 28 October 2011 - 07:38 PM

Anybody have any idea as to what that noise is or where it is coming from? Not concerned about it but just one of those things I would like to know. Thanks




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