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 Write-Up: HVAC Assembly

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EyeDoc1
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Name : Christen
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PostSubject: Re: Write-Up: HVAC Assembly   Fri Sep 08, 2017 1:21 am

OK...actually 48 hours went by and happy to say that I was able to get the ductwork back together WITHOUT resorting to removing the console.  Have broken off one plastic tab on the ductwork actually made it easier to re-install, as I only had to push down on the slot on the upper part of the pre-existing ductwork to slide the tab into place and then push up on everything to seat the clip.  Took about six minutes of laboriously working my hands around a very tight spot, but it can be done.  I recommend putting the seatback all the way down, get an old pillow for your head or take 3 ibuprofen from the back-neck strain you're gonna be feeling later.  Once you get the piece of ductwork back into place, you can then install the other piece of ductwork that's about a foot long and one side has that corrugated rectangular shape and that's a breeze compared to the other.

In fact, avoid taking the console apart at all costs, as I sure as heck broke the plastic tabs that hold the ashtray in, so that another junkyard piece I'll need to get...down the road.

Looks like the weekend will be made for a intake manifold gasket replacement on the firewall side.  Always something.

Christen
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98riv
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PostSubject: Re: Write-Up: HVAC Assembly   Fri Sep 08, 2017 7:19 am

Thanks for the info. I had a similar problem a month or so ago with my AC. My AC also needed to be charged. Weird how it will still blow cold on the passenger side and not the drivers with a low charge.

I had taken out the center console this winter to fix the cracked wood around the shifter and I also encountered the same broken clips on the ash tray. It's a bad design as the plastic isn't thick enough to be pulled on. It also doesn't help that my car is almost 20 years old. I just put some hot glue on the back of the pieces to keep it from rattling, so I didn't need to buy another one. I don't use the ash tray anyway. I also had to fix a couple of cracked plastic pieces in the center console with some epoxy, fiberglass tape and some nails for added strength.

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1998 Supercharged Riviera - Custom CAI, Alpine spx-13ref, Infinity 6x9's, Alpine 4 Channel Amp, Kicker KX3, Silverstars, STB, Hawk Brake Pads, Monroe Air Shocks, KYB GR2
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71stagegs
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PostSubject: Re: Write-Up: HVAC Assembly   Thu Dec 07, 2017 2:22 pm

Putting in a new actuator cant line up the shaft in the hvac  with the new part it  does not turn it is set all the way to 1 side should a new one
be in the middle position thx for help steve
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albertj
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PostSubject: Re: Write-Up: HVAC Assembly   Fri Dec 08, 2017 11:35 am

Inside the actuator is a synchronous motor (moves exactly some distance given certain voltage input over certain time, think analog clock) and some gears.

What worked for me: I opened the actuator (look at it real hard, you'll figure out how the case unsnaps) and reposition the gears so you can install it.  When you get things back together, cycle the HVAC (not too quickly)  through all the air flow and temperature settings to allow the actuators to correctly reposition.   Nervous about this? I don't blame you -- just open a *broken* one first, to see how it all goes together.


Last edited by albertj on Sat Dec 09, 2017 10:29 pm; edited 1 time in total
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71stagegs
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PostSubject: Re: Write-Up: HVAC Assembly   Fri Dec 08, 2017 3:07 pm

Thanks Albertj  I took it apart all u have to do is lift the gear up and it disconnects motor and I put it in the middle.I had all 3 bad on drivers side OUCH

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PostSubject: Re: Write-Up: HVAC Assembly   Sat Dec 09, 2017 10:52 pm

The actuator you pictured has a broken gear around the large black plastic hub.  It will *probably* work once assembled as-is but only until the gear breaks someplace else, which it will pretty soon. I had an actuator I "repaired" but did not have an extra large gear like that so I put it back together with a gear that looked pretty much like what you have pictured. It worked for a while, I am thinking 5 months, but I had to repair it again because it finally failed, the big gear split and came off the hub.

OK, so here's the cool thing -- GM's got great engineering but not so much variation when it comes to hard parts like this.   If you get any of their similar HVAC actuators and open them you will find similar gears inside.  

At a pick-and-pull, either at the entrance desk or customer service or what have you they will usually look up the cars for you that have the same or similar actuators you can pull from.  A bunch of cars match up to one or another of the Riv actuators.  So... you let them give you the list and hopefully the places those cars are in the lot and you just pull the actuators off the ones that are not too hard to get to.  They are so cheap at the yards you can pull several and you'll most likely get the parts you need, and now that you know how to open them you can pop them apart in the yard and check...

The other thing you can do is get *just about any* of the older (mid 80's-mid '90s) GM actuators, the older ones had metal gears and those metal gears never really did break. You can swap many of the metal gears into your actuators with good motors/bad gears and wha-la, you have ready-to-use repaired actuators. It will take some guesswork to find the cars that have actuators with metal gears.  Thinking about it, I wonder if I pulled actuators off cars older than what's listed on the Hollander.  I don't recall.  Also it occurs to me that someone with the right skills and equipment could *3D print* those gears.


Last edited by albertj on Wed Dec 13, 2017 9:06 am; edited 1 time in total
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71stagegs
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PostSubject: Re: Write-Up: HVAC Assembly   Sun Dec 10, 2017 11:13 am

Thx for the tips
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albertj
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PostSubject: Re: Write-Up: HVAC Assembly   Mon Dec 11, 2017 12:29 am

71stagegs wrote:
Thx for the tips

You're welcome. I found working on the HVAC to be a bit much and don't mind sharing what I learned. Sitting on my head under the dash was fun for my spouse to watch and not fun at all to do. And those controllers... once you take a good look inside, they are not tough to fix.

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71stagegs
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PostSubject: Re: Write-Up: HVAC Assembly   Mon Dec 11, 2017 10:09 am

LOL I took the seat out takes 10 minutes when u lay down you can get your head in there still a nightmare
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71stagegs
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Dec 13, 2017 8:12 pm

I got heat! put all 3 in today all the air flow directions work #3 in pic is rough the front bolt is a nightmare u need a universal and long extension to get it out then trying to start it is crazy I took it back out and put some clay around bolt and reinstalled it and the bolt stayed there then u have to get the universal going to get it started but at lease its in position.I took my seat out only way I could get in there.Rock Auto had Delco's for $75 I'm going to do r/s next I'm sure they are cracked too. those r over a $100
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Dec 13, 2017 9:08 pm

71stagegs wrote:
I got heat! put all 3 in today all the air flow directions work #3 in pic is rough  the front  bolt is a nightmare u need a universal and long extension to get it out then trying to start it is crazy I took it back out and put some clay around bolt and reinstalled it and the bolt stayed there then u have to get the universal going to get it started but at lease its in position.I took my seat out only way I could get in there.Rock Auto had Delco's for $75 I'm going to do r/s next I'm sure they are cracked too. those r over a $100

...again, I've had good luck with junkyard pulls.

I suspect the ones with plastic gears had already been replaced in the donor cars, and so were not that old.
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