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  #1  
Old 08-17-2018, 08:44 AM
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HVAC damper issue

So the last time I took my car out I tried to use my AC and the air comes out at the floor, no matter what I do with the controls. Checked for EATC codes and got none.

Safe to assume this is a bad damper actuator? Is it the one behind the radio?
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Old 08-17-2018, 09:07 AM
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May still be an EATC head unit issue.

The default setting for a loss of vacuum supply is to go to defrost. Defrost and floor share a common actuator, so there has to be vacuum pulling it to the floor position. If you put the EATC into Vent and it does not open the vent door, then it sounds like the issue may be internal to the head unit.
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Old 08-17-2018, 09:58 AM
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Quote:
Originally Posted by RF Overlord View Post
May still be an EATC head unit issue.

The default setting for a loss of vacuum supply is to go to defrost. Defrost and floor share a common actuator, so there has to be vacuum pulling it to the floor position. If you put the EATC into Vent and it does not open the vent door, then it sounds like the issue may be internal to the head unit.
I assume then that there is an air switch that puts vacuum to the actuator based on a command from the controller that could also be the issue?

I'm slow today. Just occurred to me that if the switch is bad I would have air to the defrost.
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https://sites.google.com/a/wmich.edu/supermarauder/
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#168

Last edited by kirk; 08-17-2018 at 10:29 AM.
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Old 08-17-2018, 11:09 AM
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Old 08-17-2018, 12:37 PM
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Quote:
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Looked there before I posted. My issue isn't one of the 4, but thanks for trying.
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#168
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Old 08-17-2018, 08:20 PM
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I would check the vacuum to the head unit, start the car and pull the hose assy off the back of the eatc.

That white hose might be ripped, or there is a also a quick connect that looks like the connection at the back of the eatc on the pass side under dash.

Idk. I'm just trying to help
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Old 08-18-2018, 10:49 AM
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The black hose is the vacuum supply. White is for fresh/recirc, blue is for the panel vents, and red and yellow are for the floor/defrost dual actuator.

Quote:
Originally Posted by kirk View Post
I assume then that there is an air switch that puts vacuum to the actuator based on a command from the controller that could also be the issue?
The vacuum "switch" is the plastic manifold that the solenoids attach to. When the controller commands a particular solenoid to open, it provides vacuum to the appropriate actuator.
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Old 08-18-2018, 12:45 PM
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Further investigation leads me to believe it is the solenoid O-rings. While air is coming out on the floor, it is also coming out the defrost. I was also getting heat today that I wasn't feeling the other day. Age and symptoms indicate it's worth changing the O-rings. Probably won't happen for a month or two.

Thanks for all the input.
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Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
https://sites.google.com/a/wmich.edu/supermarauder/
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Bought 6 June 2002
#168
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Old 08-18-2018, 01:37 PM
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Remember to use silicone o-rings, size -007. Also check the manifold for cracks or porosity. JB Weld is your friend if you find any.
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  #10  
Old 08-18-2018, 04:36 PM
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Quote:
Originally Posted by RF Overlord View Post
Remember to use silicone o-rings, size -007. Also check the manifold for cracks or porosity. JB Weld is your friend if you find any.
Big help there. Thanks
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1963 Marauder S-55, Super Marauder 406
Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
https://sites.google.com/a/wmich.edu/supermarauder/
______________________________ _____________

First retailed 2003 Marauder
Bought 6 June 2002
#168
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  #11  
Old 08-18-2018, 08:18 PM
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I can repair your EATC and replace the bulbs with LEDs.
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Old 08-19-2018, 05:40 PM
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Quote:
Originally Posted by fastblackmerc View Post
I can repair your EATC and replace the bulbs with LEDs.
Thanks, I'll ponder that.
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1963 Marauder S-55, Super Marauder 406
Only factory 406 powered Marauder, and earliest built Marauder documented to still exist.
https://sites.google.com/a/wmich.edu/supermarauder/
______________________________ _____________

First retailed 2003 Marauder
Bought 6 June 2002
#168
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  #13  
Old 09-19-2018, 12:45 PM
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How did it go? Did you get it fixed?
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  #14  
Old 09-19-2018, 01:10 PM
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I had a very similar problem. The blend door is made of plastic with a plastic hinge. The hinge broke from normal use. Took me an entire day to fix, with hardware store bought hinges and ingenuity
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