2009 Chevrolet Silverado – Poor Heat If Temperature Set Below 90°F

This 2009 Chevrolet Silverado came in with the complaint that the heater was only mildly hot unless the temperature was set to 90°F. When set to 90° the heat worked very well. I should point out that this truck has automatic HVAC controls as evidenced by the word “Auto” on the control head assembly. I … Continue reading “2009 Chevrolet Silverado – Poor Heat If Temperature Set Below 90°F”

2009 Chevrolet Silverado Driver’s Side Air Stuck On Heat

This 2009 Chevrolet Silverado came in with the complaint that the a/c was blowing out hot air on the driver’s side of the dash.The vent temperature was 140°F and the outside air temperature was 97°F in August in sunny South Carolina. I told the customer that I would not be able to get to it … Continue reading “2009 Chevrolet Silverado Driver’s Side Air Stuck On Heat”

GM “C/K” & “S/T” Vehicles, HVAC Recalibration Using a Tech 2 Scan Tool

It Recently came to my attention that some of my readers wanted to see how to perform an actuator recalibration using a Tech 2 scan tool. The pictures are dark and they are best viewed in low light conditions. Connect the scan tool to the DLC and turn the ignition on. After entering the year,make, … Continue reading “GM “C/K” & “S/T” Vehicles, HVAC Recalibration Using a Tech 2 Scan Tool”

2003 Chevrolet Silverado, HVAC Actuator Stuck

This 2003 Chevrolet Silverado came in with the complaint that the passenger vents were stuck on heat at the end of August in South Carolina.. Since it was late I decided to try a procedure that GM came out with several years ago. It applies to actuators that have over traveled for one reason or … Continue reading “2003 Chevrolet Silverado, HVAC Actuator Stuck”

2004 Chevrolet Silverado, Changing The Mode Actuator

This 2004 Chevrolet Silverado came in with the complaint that the air only blows through the defrost  and will not blow out of any other location. There were codes B0263 and B3770 stored in the HVAC module. The codes refer to mode actuator faults. To access the actuator, the driver’s side heater floor vent extension … Continue reading “2004 Chevrolet Silverado, Changing The Mode Actuator”

1995 GMC C1500, Air Will Not Blow Out The Vents

This 1995 GMC C1500 came in with the complaint that the air would blow from everywhere except the front vents. In using the controls, the air flow would adjust from the defrost to the floor. All other functions were okay as well. The mode actuator is located under the driver’s side of the dash, above … Continue reading “1995 GMC C1500, Air Will Not Blow Out The Vents”

Actuator Replacement GM Trucks and SUV’s 1999-2009

This is a list of procedures to replace the multiple actuators on General Motors Trucks and SUV’s from 1999 to 2009. These posts will apply to all of the Full Sized Trucks and SUV’s listed below. There may be slight differences between brands and trim levels. HVAC Calibration Procedure GM Trucks And SUV’s 2003 Chevrolet … Continue reading “Actuator Replacement GM Trucks and SUV’s 1999-2009”

2005 Chevrolet Tahoe, No or Erratic Heat

This 2005 Chevrolet Tahoe came in with the complaint that the heater was working erratically. The customer stated that when she started the engine in the morning there would be no heat while idling and driving down her driveway. Once she had been driving at highway speed for several minutes heat would start coming out. When … Continue reading “2005 Chevrolet Tahoe, No or Erratic Heat”

Reinstalling The Passenger Side Hush Panel, 2005 Cadillac Escalade

On this 2005 Cadillac Escalade I had to replace a faulty driver’s blend door actuator. Ironically it is mounted on the passenger side of that dash and requires removal of the lower hush panel. If there is no floor mounted center console there is no problem with removing and installing this panel. If there is … Continue reading “Reinstalling The Passenger Side Hush Panel, 2005 Cadillac Escalade”

2005 Cadillac Escalade, Driver’s Side Vents Blow Hot Air, A/C On

This 2005 Cadillac Escalade came in with the complaint that the driver’s side vents have switched to blowing only hot air with the a/c on. The passenger side air is cold. The telltale B0408 code for a faulty driver’s side blend/ temperature door actuator. Granted most people do not have a dealer level scan tool … Continue reading “2005 Cadillac Escalade, Driver’s Side Vents Blow Hot Air, A/C On”