Question about 2004 Chevrolet Silverado 1500 Crew Cab
I have a dual control a/c heater. When the heat is on drivers side blows cold and passenger side side blows hot? The a/c works fine on both sides.
When my truck is at an idle, it won't put out any heat in the cab, same thing in the summer with the A/C, what's the fix for it ?
Posted on Mar 11, 2009
You will find that the Damper Motors are much like the Instrument Cluster Gauges, Speedometer and Tachometer in that they are controlled by Stepper Motors. The Original Equipment Stepper Motors in the Instrument Cluster in 2003-200? were prone to failure. The after market replacements typically will solve the problem.
Unfortunately, accessing the Stepper Motors in the Heating A/C Plenum is a time consuming job and there will be many minor difficulties in replacing them. Unless you have a lot of experience Soldering delicate Electrical/Electronic devices it is recommended that you consult a professional to have this problem properly diagnosed and/or repaired.
First of all you need to be a contortionist to physically be able to get into the cramped quarters under the Instrument Panel and then you need a good selection of 1/4" Drive Metric Sockets and extensions. Having those tools available will allow you to gain access but finding the Stepper motors may require removing the entire Plenum and disassembling it. If you have lots of time and patience it may be possible to do it yourself. Having a good repair manual for your particular year, model and make vehicle is where to start.
A Simple Test is to shut of the Heating A/C System by turning the Ignition Switch to OFF then re-starting and see if the problem goes away. Another thing that possibly could cause it is a defective (Intermittent) Accessory Contact in the Ignition circuit.
Signed: Rapid Robe
Posted on Nov 22, 2008
Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck
Posted on Jul 29, 2009
GM has a known problem with the electric actuators that operate the blend and temperature doors in the HVAC system. There are 4 or 5 of these in the typical system. Any can start sticking or binding and cause this problem. Sometimes they can be cleaned, or they might need to be replaced. Sometimes resetting the HVAC system controller by disconnecting the battery for 10 minutes, then reconnecting it, will correct the problem.
Posted on Sep 15, 2009
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