Last post on Dec 02, 2011 at 5:43 AM
You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Silverado 2500, Heating / Cooling, Truck
#1 of 14 2004 Silverado A/C intermittent/not working
Aug 24, 2009 (1:35 pm)
2004 Chevy Silverado 5.3L Z-71, 46,000 mi. automatic transmission. Approx. 2 months ago, the A/C became intermittent (very cold air when working), then progressively, the times it worked tapered off and now the A/C does not work, other than to blow hot air. The dual-zone electronic control seems to be working properly. The serpentine belt doesn't seem loose. The compressor pully is still turning (I had a Dodge that quit and froze up making an awful noise as the belt shreaded). I havn't had the system checked by a mechanic yet, but my father-in-law (Ford mechanic) doesn't think the system coolant is low because it was blowing very cold air when it worked, if only from time to time. Don't know if it has to do with the A/C issue, but sometimes the check engine light comes on. The engine is running fine, gears shift smoothly, the oil was recently changed, all fluids topped off, doesn't run hot, and I recently had a 20 point inspection done while the dealership replaced the gauge cluster (A/C must have been working then). No other issues found/reported then. I should add that the truck has set idle for long periods until this past spring due to my working off shore over the last 3 years (hence the 46K mileage). Hate to drop a small fortune on a minor/simple fix, if there is one. Is it likely the compressor, the coolant, clogged system (from sitting idle), the control unit, a relay, or ???
#2 of 14 Re: 2004 Silverado A/C intermittent/not working [desertdoc]
Aug 25, 2009 (7:00 am)
I have a 1999 silverado with same problem. it started progressively now the ac only works every once in awhile. and if its not working its blowing hot air. I did notice that if the ac was on it would turn off going over a bump or turn.(i didnt realize this till lately as it progressively got worse) i was just ready to change the heater core.. but if it something simpler im open to ideas. thanks
#3 of 14 blower motor resistor
Aug 27, 2009 (7:39 pm)
Does anyone know if there is a website that shows how to replace a blower motor resistor on a Chevy Silverado 2500 HD ?
#4 of 14 Re: 2004 Silverado A/C intermittent/not working [desertdoc]
Jan 03, 2010 (8:20 pm)
Important !!! If your Heater has been steadily failing to "Heat"... Check your Anti Freeze Level.
#5 of 14 Re: blower motor resistor [shamill]
Jan 03, 2010 (11:45 pm)
#6 of 14 2004 gmc sierra
Jan 04, 2010 (2:23 pm)
OK I understand that there were recalls on the instrument cluster(which I need to fix yet) but the oher problem is that the dual heat system is freaky it works passenger side but not driver side. one cold one hot, now I get no heat if IM sitting still but if I drive for like 5 mins (weather or not its warmed up) I get heat blowing and the blower works great and its not just blowingthru from driving . I get red hot air blowing but if i adjust it cooler? it kills the heat completely. Someone told Me it was certain sensors or servos's? that fail and won't switch heat /cool correctly HELPPPPPPPPPPPPP. IM not gonna go pay a dealer 600.00 to put a 15.00 servo in it
#7 of 14 05 silverado using oil
Mar 15, 2010 (1:25 pm)
I purchased an 05 chevy silverado 1500 5.3L V8. I am very happy with truck. I had the oil changed 2000 miles ago and check it approximately every 500 miles. I checked it after 2000 miles and it was a quart low. the truck does not have a history of this problem. WHat would cause this to happen now, the truck only only has 55,000 miles on it? Would switching to synthetic oil make any difference
#8 of 14 Re: 2004 Silverado A/C intermittent/not working [ndhulst]
May 02, 2010 (7:04 pm)
I also have a 1999 silverado and it is now stuck on heat. I know that the air is working just fine. last year the vent was stuck on the defrost then after time it went back to the dash vents. Now it got stuck on heat even when it is on the cool setting. Does this sound like the issue you were having? And did you get it fixed, what was the problem?
#9 of 14 Re: 2004 Silverado A/C intermittent/not working [ndhulst]
Feb 04, 2011 (11:15 pm)
I have that problem. did you ever find out what the problem was?
#10 of 14 Re: 2004 gmc sierra [seamus1757]
May 09, 2011 (2:54 pm)
Did you get an answer? Having the same problem with my 2005 Silverado.