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  Topic Review (Newest First)
06-07-2019 05:05 PM
sidemouse
Quote:
Originally Posted by Pete Christ View Post
K will remember that, but still need to figure out why it’s not always cold even when turned to lowest setting!


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Well, maybe your a/c wasn't on...

I just found out this little GM hinky behavior on my Sierra 1500, haven't really checked the pala but I'm assuming they work the same...
I mean the dashboards are almost identical, and I haven't found any difference in the climate control functions between the two.

So here's the deal:
If I turn the system to RECIRCULATE the A/C comes ON regardless (although I believe I can turn it off but must do so manually and it may go to fresh air if I do?).
But if I turn it to fresh air IF I didn't have teh A/C on before it may actually be what turns it off...
So there's some kind of default behavior going on in there, between fresh air and recirculate.

Recirculate = Automatic A/C ON
Fresh Air = Turns it off if it was off before going to recirculate (I believe).

With fresh air mode:
I have to push the round blower fan speed button IN until that orange light comes on, shouldn't take much but if that little LED-like orange blip isn't lit then the A/C is off ...
If the A/C was ON before switching to recirc then it should still be ON when I come back to fresh air...
But if it wasn't ON then recirc will force it ON but coming back to fresh air turns it OFF.

Found that out the other day, I wondered same as you why is it blowing hot air?
06-05-2019 08:17 AM
Pete Christ Rolled the windows down and the compressor kicked on and cold air now



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06-05-2019 08:02 AM
Pete Christ So today the compressor must not be kicking on because the temp coming out is the same on low as on 70. Ugh so tired of this crap!


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06-04-2019 03:44 PM
plano-doug
Quote:
Originally Posted by Pete Christ View Post
<snip pic>
I see a few actuators listed. I am assuming they are on passenger side of car #15 & 16
Note there are two number 15's, one each side. Those are the hot/cold blend actuators.

Number 16 is the vent selector, the one you want, and it's above 15 on the right.

Also note number 14. I believe that is the recirc actuator. On the gen8's, it's the same part as number 15. Not sure about the gen9 cars. It's behind the glove box on gen8's, and appears to be there in the gen9 pic.

Doug

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06-04-2019 01:48 PM
Pete Christ
Ac not blowing cold



I see a few actuators listed. I am assuming they are on passenger side of car #15 & 16


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06-04-2019 01:31 PM
Pete Christ It blew out normal most of the drive this morning then went to itís blowing but not blowing mode! Car got warm so I turned fan up and temp down and heard fan spinning faster but no air coming out. Need to dig into that actuator.


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06-04-2019 01:19 PM
12 lt Would definitely take Doug's advice and take a look through the glove box and see if you can get to it. No way I would pay a dealer for a job like this.

No idea how similar the glovebox and dash are to the 8th gens and how tight it is to get to the actuators. I have had to replace one actuator in our 2012. I could see 2 of the other actuators, luckily the one I had to replace was the easiest one to get to, but I am sure I could get to the other 2 if I have to. It is tight, especially for someone with larger than average hands, but in our 8th gen(2012) I did not see where anything had to be removed.
06-04-2019 12:42 PM
plano-doug
Quote:
Originally Posted by Pete Christ View Post
Does anyone know where that actuator is located or how to service it? I would switch it out if itís not overly difficult to get to.
The Chilton procedure calls for removing the "Evaporator and Blower Module". That's the box under the center of the dash that houses the evaporator and heater core. No way would I want to do that.

But I think that has been recommended in the past, on gen8 Impalas, but most folks managed to avoid all that. Instead, on the gen8's, the glove box was dropped and then the actuator was accessed from the left side of the glove box opening. It may have even been accessible with the glove box still in place.

The drawing for the gen9 (attached) shows the actuator forward and above the right side of the radio, much like the gen8. So it appears to be accessible via the glove box opening.

What I recommend is to drop the trim above the passenger's feet, get on your back and inspect with a flashlight to see how accessible it is. Look to see how hard it is to drop the glove box. For example, you may need to pull the trim off the dash, which isn't too hard, but needs to be done with care to avoid cracking the plastic. I've even cut a small hole in the glove box to facilitate access for things like this (rather than removing it).

In short, the key is to find the actuator and size up the job. Does the glove box even need to be removed? Then decide if you want to get a part and try it yourself, or take it to a shop. (BTW, on the gen8, a 5.5mm (ie, 7/32") socket was needed for the actuator.)

Also, inspect the wiring. Make sure the connector hasn't become separated from the actuator. Maybe all that's needed is to plug it back in.

HTH.

Doug

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06-04-2019 10:12 AM
Pete Christ So when i was driving it this morning i did switch the vent select around and it didnít seem to change where the air was coming from. Like it was stuck and not moving. There is cooled air blowing out but it is so minimal air flow!

Does anyone know where that actuator is located or how to service it? I would switch it out if itís not overly difficult to get to.

My temp on the car was around 180 i think. It hasnít done it since then. It does blow cold air more often then not! I would agree that it seems that some actuator is getting stuck and not allowing the fan to blow air through any vents.


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06-04-2019 09:54 AM
plano-doug
Quote:
Originally Posted by Pete Christ View Post
Ok so it seems to be acting up again. I have the fan on high and it barely comes out of the vents. Like the fan is blocked. I can hear it blowing but not much coming out of vents!!!
Can you do some more diagnosing and post back? I don't have a gen9 Impala, but if the HVAC works like the gen8's, it sounds like you have a vent actuator (aka mode selector) problem. Can you move the vent selector knob to different positions, wait a minute, then see if the air flow changes in each of the outlets (defrost, dash, feet)?

A bad vent selector actuator could explain the lack of air coming out, especially if it's stuck between turning one off and turning another on. But it does not explain why the temperature is not right - that is controlled by a separate hot/cold blend actuator(s).

If the air temp is still an issue, do likewise with it, and adjust the temp knob(s), wait a minute, and see if the air temp changes, then report back.

This could imply multiple actuator issues, which seems improbable, but not impossible.

One other thought, is it set for fresh air or recirc? Again, I wonder if that actuator could be a factor in no air flow. Try changing that setting to see what effect it has. You can hear the effect. If you tear into the dash a bit, you also can see if it's moving.


Quote:
When it was idling it blew antifreeze out, i paniced and shut off. Turned car back on let idle for a few and it blew again.
Where did the antifreeze come out? This might indicate some sort of over-heating problem, which can affect the HVAC air temp. For example, if the radiator cooling fans are not functioning properly, the lack of airflow thru the radiator can result in the motor getting hotter _and_ the AC not cooling properly.

When you noticed the air temp issue, how did the engine temperature gauge read? Was it in its normal position, or perhaps elevated?

Doug

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06-04-2019 08:27 AM
Pete Christ Recently replaced the cabin filter. Will check the glove box nothing comes to mind as to what could be in there.


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06-04-2019 08:06 AM
Joes74challenger i found on the wifes 2011 cruze she had a car garbage bag in the glovebox. which had also been sucked into the fans above the glove box thus killing airflow. maybe check the glovebox for anything of that nature? also how is the cabin air filter doing?
06-04-2019 06:16 AM
Pete Christ Ok so it seems to be acting up again. I have the fan on high and it barely comes out of the vents. Like the fan is blocked. I can hear it blowing but not much coming out of vents!!!


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05-02-2019 07:26 PM
Michael o
Quote:
Originally Posted by Pete Christ View Post
K will remember that, but still need to figure out why itís not always cold even when turned to lowest setting!


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the reason why it blows cold sometimes and doesn't at other times is because it may probably be set to pull air from outside. if the temp outside is 64 degrees for example, and you set the AC to 60 degrees with the air circulation coming from outside, the air will feel warm. but if you set it to recirculated, it'll cool down faster
04-28-2019 12:01 PM
Pete Christ K will remember that, but still need to figure out why itís not always cold even when turned to lowest setting!


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