1996 Chevrolet S10, Air Blows Out Of The Defroster Only

This 1996 Chevrolet S10 came in with the complaint that the heater/ air conditioner air only blows out of the defroster vents regardless of where it is commanded. It is actually a pretty simple problem and strangely enough it is not an electrical problem. The most common place for failure is in the under hood … Continue reading “1996 Chevrolet S10, Air Blows Out Of The Defroster Only”

2001 Cadillac Deville DTS, Passenger Side Air Stuck on Cold

This 2001 Cadillac DeVille DTS came in with the complaint that the passenger side air was stuck on cold. There was a code B0429 stored in the Instrument Panel Module. B0429 relates to a fault with the passenger temperature door actuator assembly. To gain access to the passenger side temperature door actuator the glove box … Continue reading “2001 Cadillac Deville DTS, Passenger Side Air Stuck on Cold”

2003 Cadillac Deville, Blower Does Not Work

This 2003 Cadillac Deville DTS came in with the complaint that the blower motor does not work most of the time. Sometimes it will blow but it seems to blow slower than it should. Using a test light and a jumper wire, I connected one end of my test setup to the purple wire. Then … Continue reading “2003 Cadillac Deville, Blower Does Not Work”

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”

HVAC Actuator Recalibration Procedure For GM Trucks and SUVs

The topic of how to perform the actuator recalibration procedure on Chevrolet , GMC and Cadillac Trucks and SUVs has become an ever increasing topic of discussion. For manual systems it does not matter where the a/c controls are set but if you feel the need to do something, turn the blower switch on (I … Continue reading “HVAC Actuator Recalibration Procedure For GM Trucks and SUVs”

2005 GMC Sierra, Air Blows Only From Defroster Vents

This 2005 GMC Sierra came in with the complaint that the air will only flow from the defroster vents, regardless of where it is commanded to. This Sierra has auto a/c controls and no floor mounted center console. Of course the customer brought the truck in, knowing that I had to lay under the driver’s … Continue reading “2005 GMC Sierra, Air Blows Only From Defroster Vents”

2003 Ford Expedition, Clicking From Rear A/C Actuator

This 2003 Ford Expedition came in  because of an annoying clicking sound from the back of the vehicle. The customer stated that if he would constantly adjust the rear temperature setting the noise would go away for a little while. He was planning on taking a thousand mile trip soon and did not think he … Continue reading “2003 Ford Expedition, Clicking From Rear A/C Actuator”

2004 Chevrolet Trailblazer, Identifying Heater A/C Actuators

This 2004 Chevrolet Trailblazer came in with the air flow stuck coming out of the defroster. I have already done a post on how to replace the faulty mode actuator, but I did not have a good enough picture to identify all of the actuators on the driver’s side of the dash. To see that … Continue reading “2004 Chevrolet Trailblazer, Identifying Heater A/C Actuators”

2003 Toyota Highlander, A/C Stuck On Heat, Part 2

Well this 2003 Toyota Highlander with the a/c stuck on heat finally made it back in so that I could find out what is wrong inside the a/c control assembly. I am planning on fixing, hopefully some weak solder connections. The temperature control switch had been loose and I tightened that up and the system … Continue reading “2003 Toyota Highlander, A/C Stuck On Heat, Part 2”

1998 Ford Expedition, No Air From Vents, Air Only Flows From Defrost

After looking at diagrams I found that this Expedition uses vacuum controls to change door positions. I started looking for vacuum line problems under the hood and found the problem behind the battery. You can see the damaged section of the small plastic vacuum line, just slightly lower than center of the following picture. It … Continue reading “1998 Ford Expedition, No Air From Vents, Air Only Flows From Defrost”