88-98 Silverado Sierra Vent Noise, Sticking vents fix How to Mode Actuator

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In this video I will show you what part sticks on the HVAC box on a 1988-1998 GMT 400 Silverado Sierra Tahoe Suburban Truck, and how you can fix it.

[@soulohthru2973]

I have literally searched the entire platform of KZbin for months and finally found a video! My sweet pickled Christ you are the friggen best! One day a link just fell to the floor and lost ability to operate the hvac vents. I’m curious as to why it fell but I’ll be inspecting that tomorrow. And thanks for the part links! Very cool.

[@jiggs49us]

Changed my blend door actuator out today with a Dorman 604-102 replacement. Install went smoothly on my 1994 Silverado Extended cab. Mine was working - but the actuator was jerking in operation and not smooth. I lubed the pivot arms and springs too! The blend actuator is right by the gas pedal and pretty much out in the open. The only thing worth noting was the instructions for not plugging in or activating the new actuator until it was installed on the box shaft. Thanks for the video - great instruction.

[@Danbury97]

Whoever gave this suggestion, you are AWESOME!. I have a 1990 Chevy pickup with this exact problem. I live in Minnesota and the winter season has arrived. The defroster did not work. Without a defroster forget about driving in the winter. I followed your instructions and low and behold, you were exactly correct. I read several blogs indicating you had to remove the entire dash. You saved me a major nightmare, headache and significant time. Thanks again!

[@GhettoWagon]

+Tom Einberger Sr. No problem. It has a loud vent change now and then but its NOTHING like before. It used to stick for minutes before it switched. The Flapper doors get all crappy, the rubber seal fails on them. I have some new ones, I need to change them. The AC needs to be recovered, the HVAC box needs to come out and be disassembled Ill will do it one day, I have all the tools to do it.

[@edsog]

This also worked for my 1993 K1500!!!! Thanks so much!!!

[@GhettoWagon]

I switched my vents around because it was cold here finally, Still works. They switch fast. The vents would never move on mine until I hit like a bump in the road

[@Kevin-ng5sd]

Do you have to pull the dash to replace the flapper vents?

[@thomasstanders311]

Thank you so much for this video!! My actuator spring levers fell apart when I took the actuator off and I've had a hard time finding new levers (because gm says the levers don't fit my truck but they do) and then pictures of how they go back together. Your video shows the best pictures I could find.

[@GhettoWagon]

ya they kinda stack on each other, You can buy new levers still I think

[@rogerkellerman6388]

You did a great job with the camera views. I've got an 88 chevy pickup that I replaced the one you did in the vid. Now I have to change the one on the blend door. I think I can get to it after removing the glove box.

[@GhettoWagon]

Yea, you might be able to get to it.

[@chakas03]

Man I’m having that problem, where it doesn’t cycle to either floor or defrost great thing I came across this video going to give it a try 👍🏼

[@RMonkey]

You are the Man, I need to change my stereo and the the heater is stuck. Thanks for sharing.

[@najaereid]

On of the rods on mine is missing I cant switch it to heat do you know how to switch it manually

[@RMonkey]

@@najaereid I do not know how to do that.

[@onewheelup]

i have a 95 gmc Z71 and live in texas and its hot as hell,so i got my ac fixed it needed a new condenser yep thats where the leak was,so now i got it running and damn,its only blowing nice cold air from the floor vents haha can you believe that shit,yep feels real good on my feet.thanks for the video man,i swear if its not one thing its ten others on old trucks.later

[@edsog]

This worked for me, thanks!!

[@JoeFpoc]

Thanks. My top lever actually fell off somehow so my defrost barely worked and of course its like 0 degrees. I really don’t see how its held on so just pushed it on and hopefully it holds til nicer weather. It wasn’t the part with the clip it was like the actual arm fell off the box. I love how easy these trucks are to work on, if this had been a newer car the entire dash would have had to be taken apart

[@GhettoWagon]

Yea i dunno how they are attached either Maybe a small set screw? maybe they were glued on haha

[@JoeFpoc]

That's what it looks like, to cold to glue anything. I tried to leave that radio thing out cause it's broke anyways but my new radio is spliced in after that part. Kinda strange there's a radio, EQ/tape deck then whatever that thing is

[@leetarsiuk4606]

Thanks for the video 👍

[@bobbywomack8262]

Awesome! Going to do this on my 94 truck. Always need good AC in AZ.

[@GhettoWagon]

yea I have to run it all year long here. About 90 today.

[@Milkman3572000]

Awesome video. ty ty ty

[@mario7mag]

Sweet mang, I have that exact problem. Your truck looks in excellent shape, my dash is all cracked and broken. But I love my old pickup.

[@GhettoWagon]

No dash is cracked on it now. And my dad crashed into the left bed side so its messed up now, And the right side is failing bad when that side was crashed into and bady repaired

[@mario7mag]

@@GhettoWagon oh man, sorry to hear. Those pickups were so well built . Hope you can get it fixed up and glad no one got hurt. Thanks for sharing!!

[@GhettoWagon]

@@mario7mag No they smashed it when it was parked so its all warped now down the side. Probably no one will fix it. I'm not spending $ to repair what some idiot wrecked. Yea Its too bad no one makes a replacement dash assembly its a big piece with a steel support but I honestly think i could be re made. I looked into some injection molding places. Of course all are in CHINA because they bought all of our USA tooling that was here. Its like PC/ABS plastic the dash is made from. With a grain. Apparently LMK may of bought up the remaining GM stock of dash boards and they were selling them 10+ years ago I should of bought one. And GM discontinued the 92-94 Dash in 2009. I could of bought one. :( It was like $800 but its worth it. What is $800 going to buy you on a new junky vehicle.

[@mario7mag]

@@GhettoWagon good info, I remember LMC used to have them for about 800.00 too. eBay has some for about $500.00 that are in pretty good condition too. Well best of luck and stay safe!

[@ryanthomas1153]

If I’m not mistaken LMC just released the entire replacement dash for these trucks this year!!

[@amfinc2]

Yep definitely it. Thanks a bunch.

[@tanyadavis7610]

No heat..Already pulled out blower motor &acturator. adjusted flaps,vents. is ther a fix until can replace actuator?? Tape vents just so I can have some heat/defrost. does anyone know of any diagrams to the air flow& system?? it's -30 here in Ny so could really use the help now. please&thank you

[@LashayJackson3877]

When the AC module goes out how do you get it to work I mean I see yours is lighting up right under what's the AC module AC module but in the end that lights up but like I said my AC module does not light up how do I get it to how do I repair that who repairs that

[@richzinn4843]

Thanks I think this will save me lots of $$$$$

[@GhettoWagon]

+Rich Zinn yea, maybe a few bucks, Its still working good years later, no more SLOW to switch modes.

[@almasaztecas13]

Good video thanks .

[@jonglenn5285]

Thanks man will give it a try

[@GhettoWagon]

Did it work?

[@jonglenn5285]

Yes it did thanks for the video

[@GhettoWagon]

Glad it helped

[@michaeljilbert2075]

Thanks a bunch! This fixed my problem. I just needed a little WD-40 for mine.

[@GhettoWagon]

Yep. I should go lube mine up again its been a few years.

[@123villecard]

Do you think there is a way to reconnect the upper left linkage arm that controls the defrost flap to open and close without removing all of that? I noticed mine has come undone on my 96 chevy Cheyenne k1500. Is it something that you can just push back on?

[@GhettoWagon]

Maybe, I believe they just press on, You were able to also buy new linkage still not sure if its still available.

[@whenmountainsmove]

Really hoping someone can help, but my linkage needs replaced but I can’t figure out how they go in or what parts I may be missing to get the springs back to hooked up. Anyone know of a site I can view a diagram?

[@scottyburns7864]

91 chevy scottsdale : bower only blows out floor & defrost on ac or heat. please help,thanks

[@GhettoWagon]

Actuator could be done on it

[@JR-po3on]

I have a 1989 K1500 and I am trying to find the parts for the actuator linkages. No idea what the hell they are called but the two white links with the springs on my truck are gone. Any ideas?

[@michaeljilbert2075]

Try Pull-a-part

[@baldemarjcasas5701]

On my 94 gmc sierra i feel alot of air coming out on the floor but very little air coming out the actual 4 vents by your face I wonder if you had the same problem before doing this video? Ty

[@GhettoWagon]

The doors could be stuck of they are just worn, My Flaps have all worn rubber around the edges so they all leak and dont close all the way. I need to remove the dash, depressurize the AC ETC and remove the HVAC box and replace all of them. I bought all new pieces when it was still available.

[@baldemarjcasas5701]

@@GhettoWagon ty for the information it’s appreciated and keep TRUCKIN!

[@Fknstud]

What about when going from hot to cold it will keep clicking even when it's done? Would that be the same?

[@GhettoWagon]

No, Then the actuator needs replacement, its stripped out

[@tanyadavis7610]

is ther any way to repair it without replacing it??

[@leemorgan4037]

Well 1 thing you need to now friend and viewers as these trucks have 3 of these in different locations in the dash, go to LMC trucks and put in motor actuators and it will pull up a diagram and show you were each one is located and what its function is

[@esdrasperez1913]

I did it... and nothing pulled up.

[@shorty004]

I have a 1994 chev sieera when i start and shut off truck it ticks by the blower motor..told it was actuator...there are 3 in the truck though what is the passsenger side one called and where is it located ..thanks

[@GhettoWagon]

Yea that;s the fresh air one stuffed under the dash. It takes forever to thread the top screw creative tools. Mine still has no screw n the top spot. took forever to remove it with a nut driver and a small wrench. Was more of a challenge to start it back in

[@shorty004]

Ghetto Wagon fresh air one is passengwr side by blower fan?

[@GhettoWagon]

Yea its the recirc door or fresh air. Its right between the crack of the blower motor and the hvac box. The lower screw you can get to. The top one you need a gasket scraper or something long, and a nut driver 7mm. Place the nut driver on the top screw, support it with a gasket scraper and turn the nut driver with a 1/4 inch LONG wrench. Its a total PITA and the nut driver will fall off 5,000 times but you will eventually get it out Remove the glove box liner and shine a bright light down it and it helps. If you look under the dash by the blower motor you see the actuator or at least the wires and the connector to it I fixed it only because if the recirc does not work the AC temp sucks in this humid swamp

[@jonathanbreckenridge4758]

Is there a way to just keep the vents open for your face? I cannot figure this out in my truck at all...I've pulled apart everything. I give up lol

[@GhettoWagon]

They usually always blow though from the floor vents. Unless you find some way to reprogram what the module does, nope

[@kevinx1441]

I have 94 c1500 With the 350 I just got the truck and just Discovered That I have no heat and very little air coming out of the Vince I have lubricated the actual waiters They all seem to be opening and closing I have replaced the thermostat I have flushed the heater core And gotten all of the air out of the Colant system I have Let the truck idle for 45 minutes With the heater on and still no heat comes out out of vents I'm lost Can you help

[@GhettoWagon]

One of the blend vents could be jammed. They fall apart over time. You need to take apart the HVAC box to replace them. There are 3 you can still buy them from GM, Cheap 15 a piece

[@shorty004]

Ghetto Wagon where are these 3 located?? When i shut off my truck i get a knocking noise for about a minute even whe i start it i was told its blend door..its coming from by glove conpartment

[@johnoverstreet708]

Ryan Shordee nbb

[@jasonsimmons6684]

I just wired those to blow out the defrost. That's all it does but I don't use the a.c. or vents so no worries there. That's on a 1988 k2500

[@lanephillips7282]

Jason Simmons how did you do this

[@jasonsimmons6684]

My 88 has a linkage down there where he was at and it moves back and forth to go from floor, vent, or defrost. So I wired it to blow defrost. I mean like wire holding the linkage in the defrost spot. So you see him messing with the linkage about half way through the video. When he reaches up in the dash sliding the spring loaded thing. I thought about attaching a choke cable to it and then I could manually move from floor to vent to defrost. I mean this is an old truck I don't drive that much any more so I'm not spending a ton of time or money on it. Th module itself isnt that expensive for a daily driver if that's all that's wrong with it.

[@FullSendAuto]

i have a 89 gmc k2500 and it only works on the foot vents and it doesn't blow out the face or defroster vents. If i replace the mode actuator part will it fix the problem?

[@esdrasperez1913]

I have the same problem.

[@FullSendAuto]

@@esdrasperez1913 I figured out the solution, if you look under the dash you can see the actuators and mine wasn't connected with the metal rod so I reconnected everything and it worked

[@esdrasperez1913]

Im not sure which metal rod you are talking about.

[@123villecard]

@@FullSendAuto mine fall off every year now I can't get it to go back on. Have you had an issue out of it anymore

[@kb5wdm]

my 95 K1500 the rubber strip from the flapper doors came thru the heater vent....causing reduced air flow...I have looked all over the net for a set of replacements or the box assembly you mentioned for around 60 bucks........where can I find these????? Thanks

[@GhettoWagon]

+Mark Thompson It depends n the year I think on a 95 you can buy the whole piece with the doors for $100 or so, if its even still available which it might not be, You need to find a parts breakdown on a GM parts site and you will see it. On a 88-94 they sell just floor vent flapper door, defroster, and the center vent.

[@AllAmericanDreamChaser]

The same thing happened to me. The rubber strip came out of the heater vent. I threw it away. What does the rubber strip do?

[@GhettoWagon]

It seals the flapper doors. All mine leak. I get a little air flow out of the closed vents when the AC is on, A little out the floor, a little on the windshield I have to take apart the HVAC box and replace them all. ArizonaDesertRats

[@AllAmericanDreamChaser]

I didn't realize that they were part of the HVAC system. I threw the rubber strip away. I will look into fixing mine as well. seems like it could be a big job. Thanks for the video.

[@GhettoWagon]

ArizonaDesertRats Yea you need to take the dash out, then the HVAC box, discharge the AC.... Ill do it one day I have bought the flapper doors, still available!

[@BigAzzCuban]

How to get my truck to blow on the floor and defrost 94 2500. I can only do either or. But as of right now, no matter what setting I have it on; it only blows out the face vent.

[@BigAzzCuban]

I need my air just as much as you but for opposite reasons. It’s like 9 below zero here in Michigan!!!

[@GhettoWagon]

Does the actuator move at all? I could be dead of the control unit could not be sending a signal. That or the whole door inside the unit is jammed. Its going to happen on mine one day they are in BAD shape . Worst comes to worst for not you can just rig the linkage so the floor vent or defrost works

[@BigAzzCuban]

Ghetto Wagon it moves, it’s dirty, and it’s missing the white clip on the left side. I wonder what position would it be for floor and defrost? My next question is how do I get that option on the electric unit?

[@BrianFowlie]

my heater flap on my passenger side on my 91 Sierra is sticking...it seems to periodically tap tap tap tap. Unless i unplug the control box it continues. and idea where to start before i take it apart...September is here and I need it functional. Cheers and great video , ty.

[@GhettoWagon]

Ohh it makes that noise, that means the actuator is stripped inside. If its the mode door that goes from Floor Center or defrost that one is on the side, if its the Hot or cold actuator that one is in the middle of the dash. remove the glove box insert and you see it

[@BrianFowlie]

thanks a ton!!...its the one behind my glove box!

[@joshs6405]

I have the same problem. +Ghetto Wagon Thanks a lot for helping find the problem! Me and my buddy's trucks both have the tapping sound.

[@GhettoWagon]

Cool! Its a easy fix. The worst one is the Fresh air/ Recirc one on the passenger corner, you can get it out but it takes alot of time to figure out how to get the top screw out. Josh S

[@BrianFowlie]

that scew is an assh*le

[@iStxvn]

My problem is whenever I turn my ac or heat off it stays on an blows to the floor any idea what would cause that I have a 93 k1500

[@GhettoWagon]

Air comes through? Always did that on this one was flow through vents I guess

[@MrEdgar3216]

Would this actuator cause it to not have any heat?

[@GhettoWagon]

The actuator in the center of the dash controls the heat or AC door so if that one is dead, yea no heat

[@buckster2575]

my question is what's the difference in max and recir.

[@GhettoWagon]

Its the same.

[@IshMotorparts]

I have a 95 GMC Sierra and that same Actuator its missing I bought one from Amazon and its small so I did my research to see if I can find one but they are all the same, so Can you send me the part number for yours hope it helps me

[@GhettoWagon]

No idea what the part number is Try to get it using a GM parts manual or call the dealer

[@doublejmotorwerks]

I just finished greasing up my vent door springs after watching this video. I knew that this could be easily fixed. Axle grease from a torn front CV boot worked for me. Do you have any other vids for my 1993 4X4 Suburban?

[@GhettoWagon]

Joey Marstall Don't know I have lots of videos. Did the vent stop sticking after you greased it up? All the Flapper doors get shitty on these trucks, I need to replace mine.

[@doublejmotorwerks]

The grease worked good. My Suburban K2500 only has just over 92K miles. I really found your vid was helpful.

[@GhettoWagon]

Joey Marstall I wish I had 90k on my truck... But that was 10+ years ago. ... If It still had that mileage I would oF not worked all the bugs out of it! I should really make a play list of the other videos I have pertaining to certain vehicles. You can do the Line in mod on your truck if you get a tape player harness and hack it up, I only used mine once, But its still cool. You can do it INTERNALLY inside the radio but I never cared to take it apart to figure it out

[@danielmeraz2513]

What is that whole box assembly called and where can i buy it??

[@GhettoWagon]

probably discontinued now. Need to get your vin and look at a online parts diagram for the HVAC box

[@davidrosenthal2137]

How many blend doors on 1988c1500 pu

[@GhettoWagon]

Just 1 blend door, there are 4 flapper doors total, 3 in the center box, 1 fresh air/ recirc flapper door. 3 actuators power them all

[@Shanedog76]

my 95 GMC Sierra was pieced together by a mex!? I don't even have the bottom floor vents??? and can put my hands on the flapper inside the dash? blows out Hot ass air constantly!?

[@GhettoWagon]

Alot are pieced now. Get new flappers whole dash has come out out and then the HVAC box, AC needs to be evac'd too. One day Ill change the vents on mine the rubber is bad on them. I need to move first so I can spread out the parts

[@chris.rufner]

To the original poster.....Ghetto Wagon, I believe it is..... Did you ever get around to doing a 'how to' on replacing/fixing (forgive my vague description) the dry-rotted strips that shoot outta the lower vents? I never knew that's where they came from, but judging from the amount of "where the hell did this piece of trash come from?" rubber strips I've found over the years on the floorboards of my '94, I know am confident in saying that none of mine are still up in there.... P.S. Going outside now to use what I learned in this video to hopefully fix the problem of getting no air whatsoever directed to the passenger-facing vents.

[@chris.rufner]

Thanks to your video, I discovered that the rear actuator rod had fallen the post (at the door, not at the actuator). Two minutes, problem solved. I'm surprised there is no retaining clip, cotter pin, or other means to prevent the rod from falling off....

[@GhettoWagon]

Nahh Never felt like taking out the whole dash yet. I need to move to a house and ill do it, ill have room.

[@GhettoWagon]

Wow they are just pushed oh? wow @@chris.rufner

[@TonyC93]

When i turn on my truck the ac panel blinks on and off and then after a few seconds it stops, then i turn the ac on and it does it again and it doesnt let me change upper or lower setting on it. Do you know what could be the problem

[@jaybar10dr4hire3]

Tony Camarena ,did u ever find what was causing the flashing arrows on the ac display. I have the exact same problem but can't find any answers online. Any help on where to find info about this problem would be great!!! Thanks, -Jay

[@billcochran4072]

Jay Bar10Dr4hire I’ll second that!

[@jaybar10dr4hire3]

@@billcochran4072 so finally got around to fixing my flashing on AC display.... Prob 1-same as this video my actuator that move the linkages was shot so wentvto pull a part and founf used for 8bucks...so now i can change from floor to window. prob 2- the cold/heat arrows were telling me my heater/ac blend door actuator was stuck... i replaced after bitching to get the dash and blower cover off then replaced yhe actuator solenoid that looks same as this vid just way up underneath the dash...solved!! after all said and done.... 2 trips a to pull a part for total of 25bucks a Saturday afternoon plus a 12pack of coors and its all if fixed

[@billcochran4072]

Jay Bar10Dr4hire thanks for your response, it’s a head scratcher!

[@jonathandexter135]

I can't get mine to work right. did this but blow rips loud still no air comes out for A/C do you know where to buy all new HVAC Box I have had dash off 4 fucking times and losing my shit.

[@marleensrain]

the one i need to replace is behind the blower motor by the firewall, its a bitch

[@amfinc2]

Jealous of your tachometer, I have a 5spd k1500 and it doesn't have one!

[@GhettoWagon]

Find one in the junkyard