HVAC recirculate button
Thread Starter
Drifting
Joined: May 2004
Posts: 1,543
Likes: 1
From: Levittown NY
HVAC recirculate button
Alright all knowing Corvette Forum... It's a 95 Lt1 with the electric HVAC controls. Recirculate button lights up for a second when pressed and then goes off. Tried every combination of buttons but it won't stay on. Checked it for codes and no codes are being thrown. I'm assuming it's the door up in top right passenger footwell? Checked the door and it isn't stuck or anything. I can move it with my hand. Not sure how much vacuum or whatever should come from the line but I tried removing the orange tube and I feel and hear nothing (although it's cold out and the exhaust is loud). Any ideas?
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Alright all knowing Corvette Forum... It's a 95 Lt1 with the electric HVAC controls. Recirculate button lights up for a second when pressed and then goes off. Tried every combination of buttons but it won't stay on. Checked it for codes and no codes are being thrown.
I'm assuming it's the door up in top right passenger footwell? Checked the door and it isn't stuck or anything. I can move it with my hand. Not sure how much vacuum or whatever should come from the line but I tried removing the orange tube and I feel and hear nothing (although it's cold out and the exhaust is loud). Any ideas?
I'm assuming it's the door up in top right passenger footwell? Checked the door and it isn't stuck or anything. I can move it with my hand. Not sure how much vacuum or whatever should come from the line but I tried removing the orange tube and I feel and hear nothing (although it's cold out and the exhaust is loud). Any ideas?
In short after you get the cover off, the main board unplugs with 1 connector. Then you remove the 4 front screws, remove the board and rubber button contactor. Careful with the buttons and LEDs. Then solder the board up especially where it problem area is. Go slow, don’t overheat or let anything (leads) move.
If you're talking about the blend door it is very quiet and is motor driven. It should not move at all freely. If you want to see if it moves, remove the module from the top of the evaporator and look in with a flashlight. Set (key ON) the temp to 60 and check door, then set to 90 and check door. If it moves from side to side (90 deg) then it is OK.
Thread Starter
Drifting
Joined: May 2004
Posts: 1,543
Likes: 1
From: Levittown NY
You have bad solder connections behind the LEDs on the printed ckt board. It requires the head unit to be removed and disassembled. I have been doing this for years and there is a thread on it and see if I can find it.
In short after you get the cover off, the main board unplugs with 1 connector. Then you remove the 4 front screws, remove the board and rubber button contactor. Careful with the buttons and LEDs. Then solder the board up especially where it problem area is. Go slow, don’t overheat or let anything (leads) move.
If you're talking about the blend door it is very quiet and is motor driven. It should not move at all freely. If you want to see if it moves, remove the module from the top of the evaporator and look in with a flashlight. Set (key ON) the temp to 60 and check door, then set to 90 and check door. If it moves from side to side (90 deg) then it is OK.
In short after you get the cover off, the main board unplugs with 1 connector. Then you remove the 4 front screws, remove the board and rubber button contactor. Careful with the buttons and LEDs. Then solder the board up especially where it problem area is. Go slow, don’t overheat or let anything (leads) move.
If you're talking about the blend door it is very quiet and is motor driven. It should not move at all freely. If you want to see if it moves, remove the module from the top of the evaporator and look in with a flashlight. Set (key ON) the temp to 60 and check door, then set to 90 and check door. If it moves from side to side (90 deg) then it is OK.
I'm not sure how to better describe it. The little door I'm taking about is on the passenger side, if you follow the sill forward until it meets the firewall. Like forward of the speaker and slightly higher. It's vacuum activated. There is an orange tube going to it. I assume it's what's supposed to move when recirculate is turned on?
Race Director
Joined: Oct 2005
Posts: 11,768
Likes: 175
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
Is it below freezing outside when your trying this?
RECIRCULATE: Provides maximum cooling
or quick cool-down on very hot days. This setting
recirculates most of the air inside your vehicle.If it is
used for long periods of time, the air may become dry.
This setting directs air through the upper air vents.
It will not work when the outside temperature is
below freezing.
or quick cool-down on very hot days. This setting
recirculates most of the air inside your vehicle.If it is
used for long periods of time, the air may become dry.
This setting directs air through the upper air vents.
It will not work when the outside temperature is
below freezing.
Thread Starter
Drifting
Joined: May 2004
Posts: 1,543
Likes: 1
From: Levittown NY
Now that's interesting. I recall it was saying it was 37F on the controller when I was trying it. While that's obviously above freezing I'm wondering if it was too close to freezing that it's purposely not working? Any idea what sensor(s) it's using to determine that? I think I'm going to wait until we get into the 40s before I go crazy tracking down an issue that doesn't exist. Thanks. 
I'll report back if Spring ever shows up here. 
I'll report back if Spring ever shows up here.
Thread Starter
Drifting
Joined: May 2004
Posts: 1,543
Likes: 1
From: Levittown NY
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