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Crazy AC

J

James Price

Guest
My 96 C.E. Lt4 has some kind of crazy thing going on with the AC.

First it blows real cold, no problem there...But, it blows mostly out from the top (defrost) vent. (it will even make frost appear on the windshield!)
Sometimes it starts to come through the vents facing the passengers but when my engine speed changes it seems to change where the AC blows from....

I haven't ever modified or repaired anything in the system, it only has 31K on it.

Blowing force is good
The fan speed works fine.
Temerture is cold.

But it has a mind of it's own when it comes to where it blows from!

any ideas???
 
Joined
May 29, 2002
Messages
8,652
Location
Missoura Ozarks
Corvette
2012 💯 4LT GS Roadster
C

Cire96

Guest
Likely AC answer

I have a CE with the same problem. I'm about 99.9% certain that it's the climate control computer that's causing the air to flow out of the defroster vents (and in mine) intermittent control over fan speed when I try to operate it on the manual setting. I received a post on Corvette Forum from a CE owner who replaced his to cure the EXACT symtoms.
Access to the controller is gotten by removing the drivers side bolster below the dash with the removal of about six torx screws. Once you do that, the controller is in fairly clear view. I'm told it's a $185 dollar item and that removal / installation is tedious but not terribly difficult.
Good luck Cire96 :beer
 
Joined
Jun 20, 2002
Messages
2,509
Location
Tallahassee, FL
Corvette
none right now :(
it could be a vacuum line... If it goes to the defrost when you are Acceleration, then you have a leak... if it is random, then who knows:)
 
J

James Price

Guest
C.E. AC

Thanks for the replies on the Crazy AC. I haven't tried any of the suggestions as of yet but I will.

If Im successful, I will definitely let everyone know what worked.
 
B

bigdan

Guest
had the same problem. 1st, i had a cracked "T" in the vacuum line connection under the right fuel rail cover. part was about $6-$7 at dealer. still had problem, so i pulled the AC programmer out from under the dash, cleaned the electrical connections & tightened the vacuum line bundle connection, now all works as it should.
found the info on several different vette sites. i'll send you the links if you need them.
 
J

James Price

Guest
Fixed AC

I found a broken Vacuum Damper Valve under the passenger side fuel rail.

Fixed it and now AC works perfectly.

I repaired the old one for now until I can find somebody who has a new one.
 

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