Chevrolet C/K truck mode and blend door actuator replacement

[HANNIBAL2141]

i have a 1997 tahoe 5.3l and my unit is stuck on defrost on the windshield , what can be the problem?

[Gearheadtom]

The problem with my truck is that it seems to blow from most off the vents all the time, no matter the where I turn the mode knob, so I'm guessing it's the mode door actuator?

[WhoSaidTyler]

@Gearheadtom very likely

[Gearheadtom]

@WhoSaidTyler okay, I'll have a look to see what I can figure out, thanks a lot!!!

[Gearheadtom]

@WhoSaidTyler I checked mine, and it doesn't seem to even turn quite 1/4 turn all the way from one knob position to the farthest. I'm guessing it's supposed to move more than that.

[WhoSaidTyler]

@Gearheadtom yes

[Gearheadtom]

@WhoSaidTyler okay, now I know what to replace. Thanks for your help!!!

[iggie3]

Thanks for the instructions, gonna give this a try on my 01' Sierra this week. hope it works

[gzqgtq]

Great video. Question: In 2005 GMC Sierra, when heat is on, the driver's side vents blow cold & the passenger side blows hot, is this caused by the same actuator you replaced?

This problem only occurs when temps get below 30 degrees. After the truck gets really warm something kicks in and the heat starts blowing on the driver side. Sometimes I drive for an hour before it blows hot.

[WhoSaidTyler]

@gzqgtq Those use a more sophisticated HVAC system than this truck does, but generally it's going to either be a control head issue or an actuator, and with it working after a while I would hazard a guess that it's something wrong with the control panel.

[gzqgtq]

@WhoSaidTyler Thanks. I will check both. If the price is right for the parts, I may just replace both.

[mattysavs]

awesome video, was wondering why I could get A/C no problem but couldn't get the heat going on my Jimmy.

[WaterCop2010]

Great vid dude. I haven't had to look at a heater actuator since the old vacuum actuation valves were the common problem. I Haynes manuals don't even mention the actuators. This is a great service to your fellow gear heads!

[Neake22]

the sad thing about the actuator is that it's not the motor that's bad it will 9 times out of 10 be a broken tooth out of one of the plastic gears.

[targetcannon]

Thank you so much. I hope to get my truck back in correct repair.

[BigDogUnreal]

Thanks.... you saved me so much time ty

[gazzellanorm]

@WhoSaidTyler, Thanks I'll try to dismount and block.

[gazzellanorm]

@WhoSaidTyler, It would be an interim solution, just long enough to get the piece from the USA, I am in Italy and begins to be cold!!!!!!!!

[WhoSaidTyler]

@gazzellanorm Ah. Well just remove the appropriate actuator(on a full size it is the one mounted front and center) and use something like strong tape to hold the shaft in the right spot. Remember to not operate the new actuator until it is mounted to the HVAC box and don't turn the actuator by hand.

[gazzellanorm]

help!!!!!! is there a way to manually lock the hvac actuator on hot in my chevy blazer ' 99

[WhoSaidTyler]

@gazzellanorm  there is, but why would you want to instead of just repairing a problem?

[slliks67]

do you know if the actuators are in the same positions on a 98 chevy suburban

[WhoSaidTyler]

@slliks67 Yes, they are.

[slliks67]

@slliks67 Thanks, for the quick reply i will be replacing this as soon as i locate the part in my auto parts stores.

[JacksonJigsaw]

Thanks for the video, very useful, my 2000 chevy malibu has the air coming from the defrost, foot, and dash all at the same time. I think its the Mode Door Actuator stuck, going to dig under there and take a look at it tommorow, and replace the part.

Good lookin truck and good luck to you.

[WhoSaidTyler]

@JacksonJigsaw Thank you, I'm glad to help

[3rdtexas]

I just replaced it and still no luck i also changed out the blower motor and it has freon

[3rdtexas]

Thank you for the video it was very usefull

[alfsoccer]

do you know how to put it back into index, because mine is out of index....thank you great video...

[WhoSaidTyler]

@alfsoccer You have to replace them when that happens.

[nomi4hire]

Thanks for the descriptive video. Very helpful. when you said shut the HVAC down in addition to shutting off the ignition to replace the actuator door, did you mean shutting it down by the switching it off or removing the fuse for HVAC?

[WhoSaidTyler]

@nomi4hire Switch the system off using the controls. Then wait about 30 seconds then switch off the vehicle. This gives everything time to finish moving.

[nomi4hire]

when you said shut the HVAC down in addition to shutting off the ignition to replace the actuator door, did you mean shutting it down by the switching it off or removing the fuse for HVAC?

[mommymilestones]

I have an 01 Buick Century with a bad air diir actauator. I;ve been working on getting it out for two days. Nightmare tight spot work on. For a tall woman with a small upper body theres no room to work. I dont know how mechanics do it. Thanks fo rthe useful info.

[qthompson1000]

This is one of the most complete information videos yet for the Blend Door Actuator on a Chevy. I puchased one and damaged it during installation.

[ghtowagon]

I had the recirc door motor strip on mine. That was a pain to get to. I think there was some writeup about a way to remove it from under the dash. Its sandwiched against the firewall bad. I still have it only screwed on with one fastener as the top fastener is REALLY hard to get to.

[clubcar98]

I love working on car HVAC systems.

This seems like something people will screw up a lot on. Good video, now I know if I ever have to deal with one of these. Which I might because the floor vent on our Bonneville stays partially open at all times. Not going to mess with it now, though.

I like these early/mid 90's Chevy trucks. I was thinking about getting one when I get a truck, you seem to like them and have had a couple.

[WhoSaidTyler]

@clubcar98 I like 'em because there is a lot of leg room. I've had 6 so far:

1989 3500 dually w/454

1990 Xcab 2wd

1993 Xcab 2wd

1996 Xcab 2500 2wd

1998 single cab 4wd

1999 xcab Z71