AC barely blows
Drifting
Joined: Apr 2005
Posts: 1,899
Likes: 1
From: Oceanside CA
There was another thred about this very recently. Seems like the usual cause is a vacumn leak which doesn't allow the ducts to open fully. Someone else will probably chime in here and explain it better.
Safety Car
Joined: Feb 2004
Posts: 4,208
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From: Rochester MN
CI 5-6-7-8 Veteran
St. Jude Donor '04-'05-'06-'07
NCM Ambassador
the vacuum line that folks have found is located under the battery, and under the battery holder. The theory has been that these cars had experienced a leaky battery, and the acid has been eating away at the vacuum line (as well as possibly other lines and wires that are conveniently located under the battery).
Race Director
Joined: Feb 2004
Posts: 11,651
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From: HOW FAST WAS I GOING OFFICER? Los Angeles Hating GM Dealership Service Dept.'s Since Sept. 2004
St. Jude Donor '04-'05-'06-'07
The title reminded me of an ex-GF... same initials! 
Anyway, hope you get the issue fixed. Check you cowl area as well... make sure the intake isn't blocked.
Anyway, hope you get the issue fixed. Check you cowl area as well... make sure the intake isn't blocked.
Team Owner
Joined: Jun 2001
Posts: 55,394
Likes: 1
Originally Posted by beefaronie
When it is on high I cant really even feel the air displacement get to my face. The air is fairly cold, just not much airflow. Any suggestions?
Racer
Joined: Jun 2006
Posts: 401
Likes: 0
From: FL
Do you get a cold spot in the middle of your windshield? Do your vents route correctly when you change the mode settings? If they don't, check the vacuum tube at the rear of the manifold next to the firewall. It might've come disconnected. This will also affect the airflow because the system is pushing air through all the vents at once, instead of just the ones selected by the mode switch. Good Luck!
Race Director
Joined: Aug 2003
Posts: 16,270
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From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
NCM Sinkhole Donor
If it doesn't blow - does that mean it sucks?
Fan motor, fuses for the fan motor, obstructions? Is there any kind of error code on the DIC?
Fan motor, fuses for the fan motor, obstructions? Is there any kind of error code on the DIC?
Melting Slicks
Joined: Jul 2005
Posts: 2,572
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From: Rehoboth MA . . . NRA Life Member
St. Jude Donor '06-'07
Originally Posted by MyVetteDream
The title reminded me of an ex-GF... same initials!
In my case her name was Amanda....
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Le Mans Master
Joined: Feb 2002
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From: Waldorf MD
Originally Posted by acerider
Do you get a cold spot in the middle of your windshield? Do your vents route correctly when you change the mode settings? If they don't, check the vacuum tube at the rear of the manifold next to the firewall. It might've come disconnected. This will also affect the airflow because the system is pushing air through all the vents at once, instead of just the ones selected by the mode switch. Good Luck!
Have you replaced your oil pressure sensor recently? If so you (they?) probably did not replace the "soda straw" size vacuum line that controls the HVAC doors. Check if the "little" air flow changes to the correct location (defrost, A/C, heat) when you select it. If it doesn't, no vacuum supply (or a leak) is the cause. Good luck!
Thread Starter
Racer
Joined: May 2006
Posts: 261
Likes: 0
Originally Posted by ptdrummer54
the vacuum line that folks have found is located under the battery, and under the battery holder. The theory has been that these cars had experienced a leaky battery, and the acid has been eating away at the vacuum line (as well as possibly other lines and wires that are conveniently located under the battery).
Originally Posted by acerider
Do you get a cold spot in the middle of your windshield? Do your vents route correctly when you change the mode settings? If they don't, check the vacuum tube at the rear of the manifold next to the firewall. It might've come disconnected. This will also affect the airflow because the system is pushing air through all the vents at once, instead of just the ones selected by the mode switch. Good Luck!
Originally Posted by blacksedan87
If it doesn't blow - does that mean it sucks?
Fan motor, fuses for the fan motor, obstructions? Is there any kind of error code on the DIC?
Fan motor, fuses for the fan motor, obstructions? Is there any kind of error code on the DIC?
Originally Posted by Oldvetter
Have you replaced your oil pressure sensor recently? If so you (they?) probably did not replace the "soda straw" size vacuum line that controls the HVAC doors. Check if the "little" air flow changes to the correct location (defrost, A/C, heat) when you select it. If it doesn't, no vacuum supply (or a leak) is the cause. Good luck!
Race Director
Joined: Aug 2003
Posts: 16,270
Likes: 30
From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
NCM Sinkhole Donor
Here are the DIC codes that pertain to the HVAC systems.....
99-HVAC - Heater, Ventilation, Air Conditioning
B0332 Outside Air Temp Sensor Short to GND
B0333 Outside Air Temp Sensor Open
B0337 Inside Air Temp Sensor Short to GND
B0338 Inside Air Temp Sensor Open
B0348 Sunload Temperature Sensor Open
B0361 Left Actuator Feedback Short to GND
B0363 Left Actuator Feedback Open
B0365 Right Actuator Feedback Short to GND
B0367 Right Actuator Feedback Open
B0441 Left Actuator Out of Range
B0446 Right Actuator Out of Range
B1016 Loss of Communications with PCM
U1064 Loss of Communications with BCM
U1096 Loss of Communications with IPC
U1255 Serial Data Line Malfunction
I was looking in my service manual last night - and if there is a code, it will make it a lot easier to trouble shoot....
99-HVAC - Heater, Ventilation, Air Conditioning
B0332 Outside Air Temp Sensor Short to GND
B0333 Outside Air Temp Sensor Open
B0337 Inside Air Temp Sensor Short to GND
B0338 Inside Air Temp Sensor Open
B0348 Sunload Temperature Sensor Open
B0361 Left Actuator Feedback Short to GND
B0363 Left Actuator Feedback Open
B0365 Right Actuator Feedback Short to GND
B0367 Right Actuator Feedback Open
B0441 Left Actuator Out of Range
B0446 Right Actuator Out of Range
B1016 Loss of Communications with PCM
U1064 Loss of Communications with BCM
U1096 Loss of Communications with IPC
U1255 Serial Data Line Malfunction
I was looking in my service manual last night - and if there is a code, it will make it a lot easier to trouble shoot....
Team Owner
Joined: Feb 2000
Posts: 51,504
Likes: 6
From: Sacramento CA
Have you changed your cabin air filter? My wife's saturn barely trickled, and I changed that sucker, and its a tornado in that car now.
These should be replaced once a year.
(disclaimer: I don't know if the vette has a cabin air filter, but I can't imagine it doesn't. All modern cars I know of do.)
These should be replaced once a year.
(disclaimer: I don't know if the vette has a cabin air filter, but I can't imagine it doesn't. All modern cars I know of do.)
Thread Starter
Racer
Joined: May 2006
Posts: 261
Likes: 0
Originally Posted by Kale
Have you changed your cabin air filter? My wife's saturn barely trickled, and I changed that sucker, and its a tornado in that car now.
These should be replaced once a year.
(disclaimer: I don't know if the vette has a cabin air filter, but I can't imagine it doesn't. All modern cars I know of do.)
These should be replaced once a year.
(disclaimer: I don't know if the vette has a cabin air filter, but I can't imagine it doesn't. All modern cars I know of do.)
Never heard of it. Does anyone know about this, and where it is located???
PS nice avatar..... Two in the goo and one in the poo
Racer
Joined: Jan 2006
Posts: 479
Likes: 2
From: Hollywood Maryland
HVAC Issues
No cabin air filter in C5s. Also, check your vacum system under the battery tray. Source of vacum is MAP sensor on back of intake manifold(You can't see this without sliding the intake manifold forward). This supply line is buried in one of (Top one for my '99 FRC) wiring harness that passes through the battery compartment to a check valve behind the passenger fender near the door. Supply line comes off the check valve through the wiring harness that enters the firewall behind the battery. You have to open the wiring harnesses and find these lines to make sure they are not damaged. They look like large wires but are black plastic. It takes very little battery acid to damage these lines. I had the problem and spliced in new lines, switched to an OPTIMA, sleeved rubber fuel line over the vacum lines for added protection. All works fine now. Good luck! easy DIY project.
Drifting
Joined: Jun 2003
Posts: 1,510
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From: Life moves pretty fast... if you don't stop and look around once in a while, you could miss it!
CI 6-8-9 Veteran
Thread Starter
Racer
Joined: May 2006
Posts: 261
Likes: 0
Originally Posted by Zuti
Try this link. I did this to fix mine. Zuti
http://forums.corvetteforum.com/show....php?t=1458727
http://forums.corvetteforum.com/show....php?t=1458727
Drifting
Joined: Jun 2003
Posts: 1,510
Likes: 3
From: Life moves pretty fast... if you don't stop and look around once in a while, you could miss it!
CI 6-8-9 Veteran
Originally Posted by beefaronie
Nice write up. I will have to check that. How does the battery tray come out?
Burning Brakes
Joined: Jan 2006
Posts: 896
Likes: 0
From: Webb City Missouri
sounds like ur hamster is dieing....go to petsmart and get a new one...put him in the left air conditioning vent..he will find his way to the wheel.. kill the almost dead hamster. drop him through a hole in the floor to the road and ur AC will blow again