HVAC Mode Actuator door replacement

[RayVoy]

Originally Posted by ENVOY2003SLE

hi, great forum, thanks for all the great info. i hope this thread is the answer to my problem and i hope others can give me ideas.

2003 sle envoy. i recently (well last few months ) am only able to have A/C or heat come out of the front vents on the 3rd setting on the nob. A/C and heat works but only blows out strong on 4th and 5th setting and NOW today only on the 5th setting. before i had the battery die and had throttle problems and was able to fix it with a good cleaning of it...thanks to the forum. do you think its the " mode door actuator " that needs to be replaced? i too have had the clicking sound but strange as it might be only time i hear it is during the winter months. thanks for any help and great forum with great info.

Hi, welcome to the site.
The mode doors only control the direction of the air flow (floor/vent/dash), have nothing to do with the fan speed.
It sounds like you are having a problem with the fan speed control module. I think it's called a blower motor resistor assembly. Very common problem, it's a $25.00 fix (if u do it yourself) and located under the dash, behind the glove box. Lots of info on here, and some pictures. Try a quick search, the more recent threads are the ones to view.
You may also have a mode door problem, but the speed thing is the resistor assembly.

[ENVOY2003SLE]

thanks for your reply. after posting i did some more reading and there was someone who also had or has the same problem. the vent would or seem to not have any air/heat/ac coming threw when i turned the nob on. setting 1,2,3, now 4 acts like the off position and 5 is the only setting that pushes anything out. i'm hoping that the person who also had the same problem post a reply. do you know of any good places in Canada to buy parts besides places like CrappieTire? i also need to replace the spare tire carrier. seems like this truck needs some upkeep.

thanks

[gdewit79]

Originally Posted by 03Huggy

All the work is done from the drivers side.



Read my initial post again; it was due to the dash vents not working. The actuator door allows air to go to the dash vents and floor vents.

The problem with mine is the dash and defroster vents work, but I have no floor vents.

[ENVOY2003SLE]

and yes it was the resistor, thanks for everyones help. great forum !!!

[yar02169]

I've been searching high and low, and I'm hoping the pictures here will help. I get air through the various vents, but on the drivers side it's only warm air while the A/C works fine on the passenger side.
By looking at the directions and pictures, can I assume that the upper actuator is the one that I will need to replace to get cold air out of the driver's side vents?
The pictures do help, if it wasn't for them I wouldn't know what to look for. My Chilton's manual is useless in providing any help on this subject.

[blzr0213]

Originally Posted by yar02169

I've been searching high and low, and I'm hoping the pictures here will help. I get air through the various vents, but on the drivers side it's only warm air while the A/C works fine on the passenger side.
By looking at the directions and pictures, can I assume that the upper actuator is the one that I will need to replace to get cold air out of the driver's side vents?
The pictures do help, if it wasn't for them I wouldn't know what to look for. My Chilton's manual is useless in providing any help on this subject.

Same here, drivers side blazing hot, passenger and rear nice and cold. This also happened the same day the battery had to be replaced. Has anyone had this problem and fixed it?

[fife2001]

Originally Posted by gdewit79

The problem with mine is the dash and defroster vents work, but I have no floor vents.

I have the same problem.....I also cannot turn the defroster vents off if I want.

I did replace the mode door actuator and it clicks less but still does not work correctly.

I think the actuator works but the door itself cannot move the whole range for some reason.

[quirino18]

Originally Posted by LeonPhelps

Where is the world do you find a 5.5mm socket ?

use a 7/32 you find wrenches at sears or sockets also

[toenizzle]

I have the same issue with my 2002 tahoe, where the air only blows from the defroster vents and the feet vents. does anyone know if this procedure will work on the 2003 tahoe as well?

[toenizzle]

Originally Posted by toenizzle

I have the same issue with my 2002 tahoe, where the air only blows from the defroster vents and the feet vents. does anyone know if this procedure will work on the 2003 tahoe as well?

oops, i meant 2002 tahoe not 2003