2004 Silverado Dash Vents

[Carporg]

What usually causes the dash vents on the passengers side of the cab to stop blowing air conditioning? Is it a vacuum problem with the vent controls?

[j cAT]

Originally Posted by Carporg

What usually causes the dash vents on the passengers side of the cab to stop blowing air conditioning? Is it a vacuum problem with the vent controls?

if you have the automatic ac system this is usually the ac control module..this has caused most all these problems..they are available for about 100.oo.....

vacuum is not used ...this is controlled by motors..these controls vents and the temperature air blending...

[spire-32]

i have a 2005 but i do not have auto temp controls. i have his and her manual controls. the vents are stuck on defroster and floor and will not blow anywhere else. would this be the control module also?

[j cAT]

Originally Posted by spire-32

i have a 2005 but i do not have auto temp controls. i have his and her manual controls. the vents are stuck on defroster and floor and will not blow anywhere else. would this be the control module also?

disconnect the battery ground for 15 min then see if this clears this issue...this does work sometimes ...


then if not , this would be the hvac control module...this is where you dial in your hvac as desired...check connections and if everything looks good , it is usually this device..

your settings are changed with motors that move doors that change vents/temp demanded..

It is possible the motor is stuck ...debris can get in there and do this also sometimes..

[spire-32]

thanks for the reply. i will give it a shot and let you know what happens.

[spire-32]

the hvac control module is the head unit or where you actually dial in the desired temp and fan speeds?

[spire-32]

tried the 10 minute shut down and nothing. looked at all the connections and nothing. i guy i work with has the same set up as mine so i swapped the control modules and mine works in his truck and his does not work in my truck. not really sure where to go now?

[j cAT]

Originally Posted by spire-32

tried the 10 minute shut down and nothing. looked at all the connections and nothing. i guy i work with has the same set up as mine so i swapped the control modules and mine works in his truck and his does not work in my truck. not really sure where to go now?

the temperture control motor on the passengerside is bad or debris is interfering with it. step motors control these doors.

I never worked on these his/her temp controls...

[spire-32]

i fixed it. it is called the mode motor, it controls all of the vent doors. it is located by the gas pedal just above it. i pulled it out and checked the motor. it was bad. replace the whole assembly.