Camaroguy22

The passengers vents blow cold while the drivers vents blow warm to hot.

There is the proper level of freon in the car.

I tried the 27# fuse reset and that made no difference.

The car is throwing no HVAC codes.

I figure it is my actuator however I was pretty sure if one went bad they would throw a code. Please help!

Pie R Squared

I am having the same problem, I have a 2001 coupe, with the dual zone air. The air coming out of the driver’s side is warm while moving but starts to cool down went stopped. The passenger side seems to work fine. I checked HVAC codes and none are present.

I am going to next disconnect the battery for 60 seconds and see if the actuators recalibrate and then check for codes.

My controller was repaired by David Ruberg for the dim display in April of 08 maybe I have a problem with the controller, is there a way to test the conroller?

I have spent the last several days reading A/C posts. Bill Curlee please respond.

maestro300

I'm curious... even though you have no codes... start the car and turn AC on... wait until passenger side gets cool. Now go to the codes/HVAC and hold reset.

Feel if the air DOES get ice cold on the driver's side before turning hot. This was my case (with no codes) meaning the actuator reported correctly but the door position was not correct. I noticed by resetting codes it WILL open the door fully momentarily.

Pie R Squared

Mmmmmmmm.....I'll try this tomorrow, and if the drivers side gets cold then what?

bestvettever

Hi, if that works, your actuator on the driver side needs either reindexing,(many posts on that subject), or replacement. If it doesn't work, you are probably short on refrigerant. many posts on recharging the AC system.
Good Luck

Camaroguy22

I tried it. The drivers side vents went from warm to hot.

Pie R Squared

1) Disconnected the battery for 60+ seconds, no codes and left side warm air.
2) Did a 99-HVAC reset while driving, (that was interesting), no codes and left side warm air.

I guess my next step is to find someone to check my R-134 but I don't understand how this would effect the left side vents. I looked at the signals on the 34 pin HVAC controller and I don't see any signals that would monitor the R-134 pressure.

ziexfirestorm

all my issues started when replacing my battery ,a/c working less each time i drive it which is about twice a week like theres no high blow on a/c. then started doing the same as other guy on this original post. reindexing?

bestvettever

Hi, the reason short refrigerant levels cause the left vent to not perform properly before the entire system does not perform properly is because the refrigerant enters the evaporator on the right side, and exits after circulating to the left side, when the levels are low the amount of refrigerant that is there is not enough to complete the cycle before absorbing all the heat in the evaporator coils, so the left side being the last stop on the evaporator cycle gets short changed. That's a somewhat simplistic explanation, but in essence, the system is engineered for a specific amount of refrigerant, and when not enough is there, there will be warm spots on the evap coil.
Check the levels and recharge.
Good Luck

corvette Mark

low freon................

Gene Culley

Lots of times it has been the left actuator as well. Sounds like low freon or left actuator!

maestro300

If my driver's side blows warm air... by doing HVAC reset, it will momentarily blow ice cold air on the driver's side before going hot then back to warm. Unfortunately my actuator could not be indexed; also moved the damper with my finger (actuator removed) and it was still blowing warm air.

What else could it be for mine? If it was the actuator; manually flipping the damper door should have bypassed it right? Why does it turn ice cold the instant I hit reset on HVAC before sweeping to hot (then back to warm) ? I guess I'm a bit confused.

Gene Culley

Unfortunately you'd have to get the service manual and go through the diagnostics chart to fix.