What do ea. HVAC Actuators do? (Airflow from all 3 places) - Chevy Impala SS Forum
 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 07-05-2017, 03:36 PM Thread Starter
Senior Member
 
juniorwatson's Avatar
 
Join Date: Aug 2007
Location: Georgetown, TX
Posts: 2,505
 
What do ea. HVAC Actuators do? (Airflow from all 3 places)

I'm trying to determine the root cause of my problem, and wanted to get an understanding of what the actuators in our car's HVAC system do.



-I assume that #65, controls the air intake, from fresh to recirculate (ON MAX)

-#64 I assume something with the VENT control, changes the flow from Defrost, Vent, or floor.

-#63 I assume something with the FLOOR & DEFROST?

I am having air come from all 3 locations by default.

I have removed the vacuum line from #64, and checked for vacuum on the incoming line; nothing. I then checked to see if the actuator held vacuum, nothing.

I then applied and held a vacuum to #64, and I get full VENT mode.

So, I'm trying to track down my problem, and think it's got something to do with where #64 gets it's vacuum.

I assume #66 is just a reservoir tank?

Thanks!

Clear Image Tri-Ys & Hi-Flow cats >> 2.5" X-Pipe & Magnaflow Tri-Chambers, Mike Harris 4L60E, Circle-D 2,400 RPM TC, All MOOG FT End & Del-A-Lum bushed MOOG CTRL Arms, Eibach FT & New Stock HT rear springs. Hotchkis Sway Bars & End Links, RAISS, 3.73 Gears in Eaton carrier, Dynoshaft & CIA Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. 20's, Z28 Cluster, Corbeau GTS Seat
juniorwatson is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 07-06-2017, 07:45 AM
Senior Member
 
Join Date: May 2001
Location: Southeast Michigan
Posts: 377
 
Vacuum for the control actuators come off the passenger side of the intake manifold. There is a small line that runs through the firewall with the wiring harness bulkhead.
Ken
Ken Hennessy is offline  
post #3 of 3 (permalink) Old 07-06-2017, 08:02 AM Thread Starter
Senior Member
 
juniorwatson's Avatar
 
Join Date: Aug 2007
Location: Georgetown, TX
Posts: 2,505
 
Yeah I found the passenger's side connection last night.

Apparently after doing more investigating, and tearing things apart, I found that NONE of the HVAC system is working.

The flapper/vent door for fresh/recirculate doesn't do anything at all.

I checked each and every vacuum connection on the actuators, as well as all the individual lines, and found that everything holds a vacuum.

I've got some homework to do tonight.

Clear Image Tri-Ys & Hi-Flow cats >> 2.5" X-Pipe & Magnaflow Tri-Chambers, Mike Harris 4L60E, Circle-D 2,400 RPM TC, All MOOG FT End & Del-A-Lum bushed MOOG CTRL Arms, Eibach FT & New Stock HT rear springs. Hotchkis Sway Bars & End Links, RAISS, 3.73 Gears in Eaton carrier, Dynoshaft & CIA Loop, BMR Trailing Arms, Braided Brake Hoses, Taylor Spiro-Pro Wires, AutoMeter Water Temp & Oil PSI Gauges, Impala Console. ATE Blue Brake Fluid. Skip White distributor. 20's, Z28 Cluster, Corbeau GTS Seat
juniorwatson is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Impala SS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome