Last post on Sep 30, 2013 at 7:06 PM
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What is this discussion about?
Heating / Cooling
#685 of 839 Re: 2004 Chevy Silverado A/C [llcooljj26]
Oct 05, 2007 (8:36 am)
I DEVELOPED THE SAME PROBLEM WITH MT 2004 SILVERADO A COUPLE WEEKS AGO. THE DEALER SAYS THEY HAVE NOT HERD MUCH ABOUT IT BUT I DO NOT BELIEVE THEM. I HAVE ONLY 25,000 MILES ON MINE BUT AM OUT OF WARRANTY. I STARTED TAKING APART THE DASH & DUCT WORK YESTERDAY. HERES WHAT I FOUND. THE DUAL CONTROL SWICTHES RUN $161 + TAX AND THE ACTUATOR THAT MIXES THE HEATED AIR WITH THE COOL AIR IS $181 + TAX. THE BIGGER PROBLEM IS I'M NOT SURE WITCH ONE IF EITHER IS BAD AND THEIR ARE NO RETURNS ON ELECTRONICS FROM THE DEALER. I STARTED AND STOPPED THE TRUCK AT LEAST A DOZZEN TIMES AND CANNOT DUPLICATE THE PROBLEM WHEN I WANT TO IT HAPPENS RADOMLY. ANY LUCK ON YOURS?
#686 of 839 Re: 2004 Chevy Silverado A/C [wornout59]
Oct 05, 2007 (3:58 pm)
Ok, first thing. DO NOT buy parts without testing.
Testing/Diagnostics/Checking is the first thing you should ever do. Throwing parts at it is rarely productive and most times costly.
Now this is where a good information system comes in handy.
AlldataDIY is something you should have before starting a repair. I know, it may sound like an advertisement, but understand that a manual does NOT give you updated information and service bulletins.
That being said, there is a service bulletin about Synchronizing the passenger and driver's side.
(See next post)
#687 of 839 Re: 2004 Chevy Silverado A/C [wornout59]
Oct 05, 2007 (3:59 pm)
A/C - System Changes/Synchronization
Bulletin No.: 03-01-39-008
Date: June 25, 2003
Changes in A/C Compressor On/Off Instrument Panel Display Symbol from 2003 to 2004 Model Year and Synchronizing the Driver and Passenger Set Temperatures
2003-2004 Cadillac Escalade, Escalade ESV, Escalade EXT
2003-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2003-2004 GMC Denali, Denali XL, Sierra, Sierra Denali, Yukon, Yukon XL
2003-2004 HUMMER H2
with Dual Zone Automatic Climate Control (RPO CJ2)
This bulletin is being issued to clarify the operation of the A/C compressor and to explain the driver and passenger set temperature operation on vehicles equipped with dual zone automatic climate control systems (RPO CJ2).
Operation of A/C Compressor 2003 A/C OFF Indicator
On 2003 model year vehicles, a snowflake with a slash through it is shown on the display when the A/C has been turned off (by a press of the A/C button). The A/C can be turned on by pressing the AUTO button or pressing the A/C button again. This will remove the indicator from the display.
Some customers may comment about poor A/C performance after they've pressed the A/C button and see what appears to be the snowflake illuminated on the display. What has actually happened, though, is that they have disabled the operation of the A/C compressor and the snowflake symbol, upon closer inspection, has a slash through it.
2004 A/C ON Indicator
On 2004 model year vehicles, the indicator will change to a snowflake (without the slash) and it will be illuminated whenever the A/C compressor operation is enabled.
Driver and Passenger Set Temperature Operation
The display of driver and passenger set temperature may also cause confusion. It is possible to set the left temperature control to full cold and the right temperature control to full hot with little indication on the display that the two temperatures are set differently.
If the driver set temperature is set to 16°C (60°F) and the passenger set temperature is set to 32°C (90°F), the display will show the passenger set temperature for only five seconds. After that time, the display will show only the driver set temperature and a small arrow pointing left. The arrow is very important because it is the only indicator that the left and right temperatures are not equal. When both the driver and passenger set temperatures are equal, the display will have arrows pointing both left and right.
With different set temperatures, it is possible to have the left temperature door flowing air through the evaporator and the right temperature door flowing air through the heater core. This may cause the overall passenger compartment temperature to not be cooled or heated as well as the customer might expect.
In order to synchronize the driver and passenger temperatures, follow these steps:
^ Set the driver and passenger set temperatures to the desired temperatures, OR
^ Push and hold the AUTO button for at least four seconds to make both driver and passenger set temperatures set to the driver's set temperature. Both set temperatures can be controlled by the left temperature control knob when the zones are linked in this manner. Turning the passenger set temperature knob will "unlink" the zones again.
#688 of 839 Re: 2004 Chevy Silverado A/C [0patience]
Oct 06, 2007 (7:44 am)
Thanks for the tips. Its a manual dual control which of course is silly since the passenger is only 18 inches away so I do not think sync is the answer since the controls work independently and flawlessly when repeatedly checked. The heated hot air blows out of the drivers side randomly & without warrning with the air on or off, at that time the drivers side temp contol is useless. This is south florida so the slide switch is normally always at the bottom (cold setting). Only turning off the engine and restarting will reset the sytem to normal operation. I spoke to another service tech at a GMC dealer yesterday who indicated that 99% of the time its the temp actuator. Any thoughts?
#689 of 839 climate control help Gmc
Oct 07, 2007 (5:11 am)
climate control help GMC Denali, when I set temp fan blows on high and doesn't slow down when temp is reached also only blows cold unless temp is set to 90 degrees, actuators zones appear to be working fine. temperature sensor? if so where is it? thanks please help dealer wants big bucks to fix.
#690 of 839 Re: climate control help Gmc [biggiedave1]
Oct 07, 2007 (8:46 am)
A parts tech for Chevy told me that the green board with metal contacts run thru was what controlled the fan speed. It is easily located in front of the blower fan. where passengers right foot wound be. Remove AC shroud first only 2 screws to remove board 4 for shroud. I would take that part to a dealer to confirm but order online to save 50% or more, do a parts search & compare $. the tech also said it was a common failer.
#691 of 839 Re: climate control help Gmc [wornout59]
Oct 07, 2007 (11:38 am)
i can manually reduce speed, it goes to hi on auto mode and will not reduce fan speed when temp is achieved and again only blows warm air when thermostat is set at 90.
#692 of 839 Re: climate control help Gmc [biggiedave1]
Oct 12, 2007 (1:51 pm)
Should be the same board I was refering to. I think it detects the tempeture and when set temp. is reached it drops the fan speed down. I do not have the auto temp. so I haven't got that problem. Good luck
#693 of 839 Re: Only hot air blowing out of vents on Nissan Sentra 2000 [Mr_Shiftright]
Oct 17, 2007 (7:13 pm)
I have 2005 nissan sentra with the same problem. these days are kind of cold mornings, so I turned the knob to the heater, when in the afternoon tried to run the A/C by turning the knob to cold, I still get hot air.
It looks like the heat/cold valve is stuck on the heat.
Do you have update on your car situation, I mean did you figure it out what exactly was the problem.
Thanks for any update you provide
#694 of 839 Re: 2004 Chevy Silverado A/C [wornout59]
Oct 17, 2007 (7:52 pm)
I have the exact same problem. 2004 Silverado. With AC on (or even just the vent) I will get very hot air blowing from the drivers side vents only. And, as you said, must re-start the vehicle to "re-set". Did you find what the problem was exactly and what was the part name/number?