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 Write-Up: HVAC Assembly

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charlieRobinson
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PostSubject: Re: Write-Up: HVAC Assembly   Thu Sep 06, 2012 3:30 pm

Tajis, so what are the exact tools you used? A thumb wheel ratchet? what size?
and the wobble socket extension with a 7/32 adapter connects to the ratchet?
Time for me to upgrade the tool box!

Please let me know so I know what to go shopping for, thank you!
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Tajis
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PostSubject: Re: Write-Up: HVAC Assembly   Sun Sep 09, 2012 12:32 pm

charlieRobinson wrote:
Tajis, so what are the exact tools you used? A thumb wheel ratchet? what size?
and the wobble socket extension with a 7/32 adapter connects to the ratchet?
Time for me to upgrade the tool box!

Please let me know so I know what to go shopping for, thank you!

The thumbwheel ratchet I bought was a quarter inch Craftsman. Sears carries them and they aren't too expensive. It made my life a lot easier. smile

I used a generic wobble socket extension kit, quarter inch, with the 7/32 bit. You can use this either with a standard ratchet or the thumbwheel ratchet, but I found it easier to use with the thumbwheel ratchet due to lack of space. Keep in mind there's barely any room to get a grip on the bolt. I plan on replacing the standard bolts with bolts that have a screwdriver notch in them for future ease of access.
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96riv
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PostSubject: Re: Write-Up: HVAC Assembly   Tue Jan 22, 2013 9:27 pm

I just replaced #2 actuator. It must have been replaced before me because only 2 bolts were in place. It was a bit of a pain but no harder than working on my 87. Special thanks to Morad for fast shipping to Phoenix, ordered on Friday the 18th and received Tuesday 22nd.
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rk0ehn
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Mar 27, 2013 1:42 pm

Hi All,

It's been a long time I have posted anything. Anyway here a leave you with a video I made when I adjusted one of the actuators, this is in the far left side of the instrument panel, the Air Inlet Door Actuator.

Hope it helps smile

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Karma
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Mar 27, 2013 2:12 pm

^- This post deserves more then the single merit point I can give it. Good work!!

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rk0ehn
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Mar 27, 2013 5:10 pm

Thank you smile
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99Rivman
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Mar 27, 2013 8:02 pm

Nice vid! I have had a couple of them out and apart a couple of time but didn't do a video.

That is the one that is the biggest pain in the a$$ to get to, thats for sure headbutt
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atteboy1
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PostSubject: Re: Write-Up: HVAC Assembly   Mon Apr 22, 2013 12:48 pm

I'd like to get some advice as a follow up on this thread:

I have a 1997 Riv SC which is blowing hot air on the drivers side and center vents while the AC is set to cool. This has happened for about 8 months off and on. It has self corrected in the past. Now it is happening full time.

With the help of the pictures and messages found here I was able to locate and remove the actuator controlling the blend door mixer on the passenger side. After removing the actuator and reconnecting the power to it I saw that it appeared to work sporadically. I reinstalled it but it wouldn't control the blend door as it was supposed to. I removed it and with the help of a small wrench I was able to easily move the shaft to open the blend door as needed. (I couldn't turn it by hand as I couldn't get a good enough grip with my fingers.

Here is my plan - I am going to drive the car with the actuator removed and set the blend door on the drivers side to full AC as it is nearly AC weather all the time here in Tampa. I hate to purchase a new actuator if it isn't the problem but if any of you can provide an educated guess as to the the actuator being the problem I will do so. (since I'm capable of easily replacing the old one)

I've read the comments on the blend door sticking and was wondering how much effort it should normally take to turn the shaft. Is it so free that I should be able to turn it with my fingers easily. Or is turning it with a wrench "easily" the way it would normally work. If I feel the blend door is OK I'll buy the new actuator and install it.

Thanks to all the help on this thread. Appreciate any advice or help you can provide. Atteboy1


Last edited by atteboy1 on Mon Apr 22, 2013 4:23 pm; edited 1 time in total
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atteboy1
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PostSubject: Re: Write-Up: HVAC Assembly   Mon Apr 22, 2013 12:50 pm

Correction: Meant to say I removed the actuator controlling the blend door on the "drivers" side.

Atteboy1
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rk0ehn
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PostSubject: Re: Write-Up: HVAC Assembly   Tue Apr 23, 2013 10:06 pm

You can adjust the potentiometer as shown in the vid, I think you have a gear broken from the main gear(wheel), I have this issue in almost all of my actuators and most of them (if not all of them) only work in from one side of the Main Gear I have adjusted those already, here is how you should set the main gear after adjustments:



I want to say that with the new scan tool (OTC Genisys 5.0) I recently acquired this task is MUCH MUCH easier as the PCM tells you the "count numbers" of the potentiometer and the "desired counts" when opened or closed. whenever I have the chance I can show you this.
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rk0ehn
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PostSubject: Re: Write-Up: HVAC Assembly   Tue Apr 23, 2013 10:09 pm

VegasScott wrote:
Anyway, I took out the center actuator and found out the big gear was cracked.

This is what I meant, the broken gear will pass the blue gear and mess the functionality of the actuator this will just try to go back and forth and eventually stop self-adjusting in the incorrect position.
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charlieRobinson
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PostSubject: Re: Write-Up: HVAC Assembly   Tue Apr 23, 2013 10:53 pm

Theres gotta be a place online to buy a new gear and replace it.
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atteboy1
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Apr 24, 2013 9:41 am

Thanks for your replies. I actually opened up the actuator and inspected all the gears and found no broken wheels or teeth. I wasn't really able to understand how the potentiometer worked though.

Atteboy1
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rk0ehn
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PostSubject: Re: Write-Up: HVAC Assembly   Thu Apr 25, 2013 10:05 pm

atteboy1 wrote:
I reinstalled it but it wouldn't control the blend door as it was supposed to.

how did you determine this? how did it behave? I'm suspecting of a bad wiring some where.

If there is a problem with this actuator (electronically) the "TEMP" numbers should blink indicating a DTC in the HVAC system, but you will need a proper scanner that can read these codes.

Here is some info that it might help
:






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atteboy1
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PostSubject: Re: Write-Up: HVAC Assembly   Fri Apr 26, 2013 8:51 pm

Christian,

I can see you are a good bit more educated about these systems than I. Especially when I see all the flow charts and electrical schematics. Wish I was that I was that informed but I'm not, unfortunately.

But your question was how was I able to reinstall the actuator and determine that it still wasn't working? Well at the time it was about 85 degrees here in tampa, I had the HVAC system set to Auto, and I dialed down the temperature to 70 and got hot air out of the drivers side - still. So I figured it still wasn't opening as needed.

I removed the actuator again, manually opened the blend door and voila, cool air. No electrical knowledge, just go figured.

Atteboy1
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charlieRobinson
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PostSubject: Re: Write-Up: HVAC Assembly   Fri Jun 28, 2013 11:08 am

99Rivman wrote:



The actuators are listed as follows:
1 Defrost Actuator
2 Mode Actuator
3 Air Mix Actuator

Hot air on the driver's side. Cold on passenger. That means it's #3, right? I'm going to hunt for a new one of these mech boxes and swap it out.

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99Rivman
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PostSubject: Re: Write-Up: HVAC Assembly   Sat Jun 29, 2013 7:17 pm

Make sure your system is "fully" charged first, that has been known to be the problem sometimes. These actuators can be taken apart and made to work if that does end up being your problem.
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albertj
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PostSubject: Re: Write-Up: HVAC Assembly   Sun Jun 30, 2013 12:29 am

I had hot air drivers side, cold pax side... Turned out to be undercharged system. Over the years the refrigerant seeps out, I was down to 0.3 kg, system takes 0.9 kg.

runs excellent after the recharge.

if you take it to a reputable mechanic it should cost 30 to 50 to check for leaks and a bit maybe 20 to 40 more to refill system.
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VJD2
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PostSubject: Re: Write-Up: HVAC Assembly   Mon Jan 13, 2014 7:53 pm

Which one of the actuators controls the floor vents? I haven't seen that mentioned in this post unless I missed it. I have defrost and center vent airflow but no flow to the floor. Thanks!
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99Rivman
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PostSubject: Re: Write-Up: HVAC Assembly   Tue Jan 14, 2014 5:21 pm

VJD2 wrote:
Which one of the actuators controls the floor vents? I haven't seen that mentioned in this post unless I missed it. I have defrost and center vent airflow but no flow to the floor. Thanks!

I actually believe they all have to work together to get the flow to the right place? I’m not positive and can’t look right now but I think the defrost and A/C doors have to be closed for the air to flow out the floor vents? The figures on previous pages show when it is in A/C mode, I would have to look at the “heat mode” figure to see how they should be positioned? I’ll try and get you something by this weekend.
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VJD2
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Jan 15, 2014 11:18 am

Ya I'm not sure, I was trying to figure it out by looking at all the diagrams posted but nothing gives a clue. I didn't even see them outline a floor vent!

I'd appreciate any help and thanks in advance!
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98riv
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PostSubject: Re: Write-Up: HVAC Assembly   Wed Jan 15, 2014 11:52 am

VJD2 wrote:
Ya I'm not sure, I was trying to figure it out by looking at all the diagrams posted but nothing gives a clue. I didn't even see them outline a floor vent!

I'd appreciate any help and thanks in advance!

You can always watch to see which actuator moves when you change the temperature, etc. Change the temperature to see which actuator moves, then go onto the next option. By process of elimination you should be able to narrow down to which actuator that needs to be inspected.

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stydel311
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PostSubject: Re: Write-Up: HVAC Assembly   Tue Dec 16, 2014 12:40 am

99Rivman wrote:


The actuators are listed as follows:
1 Defrost Actuator
2 Mode Actuator
3 Air Mix Actuator

After I shut the car off one night I could hear a door motor running back and forth for several minutes.  After it stopped I started it back up and the ECC screen was flashing.  Either side temperature controls are fine, but all I can get is defrost on any setting.  If I set it to mid only I get a tiny bit out of the center vents but still defrost at the same time.  Would that be the #1 actuator or the #2?  I'm guessing when I heard it running back and forth that the gear cracked and it was trying to adjust and then gave up.
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kelliestime2
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PostSubject: Re: Write-Up: HVAC Assembly   Sun Sep 27, 2015 12:25 pm

Having problems just running the vents, air hasn't worked for quite a while. used my heater once a couple of weeks ago and now even on vent if is still pumping what feels like engine hot air through middle vents, under drivers side and drivers door vent. Am I still looking at the actuator scenario? 98 Riviera
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