A/C vent mode stuck any advice
Thread Starter
Instructor
Joined: Dec 2002
Posts: 217
Likes: 0
From: Gainesville Va
A/C vent mode stuck any advice
I'm off for the summer limited tools right now my a/c just went to defrost and some vent air like it's stuck between I have a 98 c5 looking at service manual cj2 test I will need to remove dash cluster access vacuum solenoid to test anyone know the fail rate should I have one there at that time is this the most likely cause THANKS
Burning Brakes
Joined: Sep 2003
Posts: 1,085
Likes: 0
From: Broken Arrow OK
Usually caused by bad vacuum to air diverter doors. Had it happen to me twice as a result of leaking battery damaging vacuum lines. See
http://forums.corvetteforum.com/show...013&forum_id=1
http://forums.corvetteforum.com/show...375&forum_id=1
http://forums.corvetteforum.com/show...013&forum_id=1
http://forums.corvetteforum.com/show...375&forum_id=1
Race Director
Joined: Apr 2001
Posts: 19,329
Likes: 16
From: Saint Augustine, FL
Mid-TN Events Coordinator
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Did you see if there were any codes?
Also, did you recently pull the battery power? (sounds like a stupid question, but trust me on this)
Also, did you recently pull the battery power? (sounds like a stupid question, but trust me on this)
Thread Starter
Instructor
Joined: Dec 2002
Posts: 217
Likes: 0
From: Gainesville Va
Did not ck codes no scan tool avail. right now. No I have not removed battery lately where are the vacuum lines where do they connect to engine so I can trace those first. Thank you
Le Mans Master
Joined: Oct 2003
Posts: 6,126
Likes: 19
From: Streamwood illinois
you dont need a scan tool to check codes. Clear any display on dic. Hold the #4 button and ht the #1 button 4 times. Then you can use 1-4 to scroll through codes or let it auto display them.
What exaclty is going on? Air wont switch to any other vents then defrost? Does the HVAC display say it changed? if so, its probaly a vacuum line issue. Let me know, you probably dont have to remove dash. YOU can apply vacuum to the hose under the dash by the blower motor and see if the door is in fact operating. if so, its the vacuum to the door that is at fault.
Dave
What exaclty is going on? Air wont switch to any other vents then defrost? Does the HVAC display say it changed? if so, its probaly a vacuum line issue. Let me know, you probably dont have to remove dash. YOU can apply vacuum to the hose under the dash by the blower motor and see if the door is in fact operating. if so, its the vacuum to the door that is at fault.
Dave
Thread Starter
Instructor
Joined: Dec 2002
Posts: 217
Likes: 0
From: Gainesville Va
Air blows from both vents and defrost and the display changes no hvac codes some other u1255h,u1064h,u1016h,u1096h havent cked manual yet I'm going to ck vacuum at mode diaphram now Thanks Just cked vacuum and actuator seem fine but noticed air on pass side much cooler than driver still mixed defrost and vent
Last edited by David Plum; Jul 17, 2005 at 04:35 PM.
