AC warm from drivers vents, cold from passenger vents

[InFiD3ViL]

I am afraid to hear the answers to this as I am aware of what it may be, but lets try anyway.

Anyhow, new AC Delco compressor, new drier/desiccant bag, new expansion valve, and all new seals. The compressor was replaced because of a bad seal and was leaking refrigerant, no catastrophic failure.

Fully charged @ 1.32lbs and pressures look great on the gauges/manifold, but I am getting warm air from the driver's side vents. The passenger side vents are definitely colder. Can this be blend door related? I thought the blend door would affect ALL the vents, not just the driver's side. I can switch between warm/cold without issue.

Update: I just did a relearn on the HVAC door actuators in the GM GDS2 software, but it made no difference, although I could hear some humming and noise. Still warm on the 2 driver side vents, cold on the passenger. Really weird since this car doesn't have dual zone climate controls.

[CamaroBarb]

Blocked vent passage or disconnected duct work. Is the air coming out as forceful as the other side?

[mikeman]

Another blend door inside that broke perhaps?

[InFiD3ViL]

It seems to be just as strong on both sides.

[Scotty D]

That’s exactly the problem
Blend door

[InFiD3ViL]

Originally Posted by Scotty D

That’s exactly the problem
Blend door

Damn man, I hope not. Thing is, I can switch to heat and back to cool just fine. Also floor and defrost.

So if it is affecting AC, is it not fully closing (or opening), allowing some heat to mix in? I am having a hard time picturing it in my head. Also, the passenger side that the AC is working on is still not as cold as it should be, but its about 20 degrees colder than the driver side.

[mikeman]

I think I remember reading that one of the signs of a broken blend door is cold on one side and hot on the other.

[Camaro2ss2010]

Possibly the air conditioner coil

[InFiD3ViL]

So an update here. I live in Florida, so it has been a while since I used the heat. Decided to test that out a few minutes ago. Car at full operating temp, same thing. Left vent hits 96 degrees (nowhere near as hot as usual), and the right vent is much cooler. My heat used to be as hot as Satan's balls.

So, it is looking like it is the blend door. It is either stuck in between hot/cold or it has fallen off completely and I am getting a mixture of both temps.

When I run the GM GDS software on it I get no DTCs and it also thinks that it it moving the blend door, as it counts the movements. I would have to look again, but I think they are called 'Ticks', with 0 being closed and 650 being full open (or vice versa). But either way, GM's own software doesn't detect an issue, which is kind of expected if the actuator itself is still working and just the plastic tab on the door broke.

[ariZona28]

Using the left selector. Feet, face or defrost. Same temps? I would think you should be getting air temps in 40's at all locations with A/C on.

[InFiD3ViL]

Pretty much same temps everywhere now. My original post was going on the assumption that my heat still worked, but I hadn't used it in a while.

In other words, AC is mildly cool and heat is very mildly warm, in all positions. Left vent always warmer when through the dash, whether its in AC or heat mode.

[CamaroBarb]

Pinch off the heater hose out at the engine then test the cold. Also maybe the door broke off and is cocked letting air flow more to one side than the other.

[InFiD3ViL]

Originally Posted by CamaroBarb

Pinch off the heater hose out at the engine then test the cold. Also maybe the door broke off and is cocked letting air flow more to one side than the other.

I will give that a try tomorrow. Thanks man.

[mikeman]

Disconnect the actuator servo from the blend door/heater core housing and place something inside to where you can turn the door manually. If it is broken, you will know as you try turning it while feeling the air temp coming from the dash vents.