[lt4camaro]

Originally Posted by Bad Anvil Garage

What about the rear defogger turning itself on automatically at times upon startup? Anyone ever have that issue?

The electric grid power switch for the back glass should always default to off on a shut off and restart of the engine. Should always require manual activation after start up.

[Obzen]

Originally Posted by Navigator

to not blow out heat when it is set to off?

Think about it this way:
Off turns off the fans but it still leaves the venting open.

Only way to stop that is to turn on the re-circ. Any vented air is still subject to the temperature control.

This isn't unique to the Camaro.

[lt4camaro]

Originally Posted by Obzen

Think about it this way:
Off turns off the fans but it still leaves the venting open.

Only way to stop that is to turn on the re-circ. Any vented air is still subject to the temperature control.

This isn't unique to the Camaro.

Your right, been that way a very long time. With the fans off , you still have venting going on, venting is affected by the temperature setting , need to turn the temp down (put it down till it says low) re-circ to out side air and air thru the vents while moving can only be outside air temp.

[Need4Camaro]

I had this problem primarily with my 1LT V6 although not as bad with my 2SS. With the climate control powered off and the temp set to like 75 and it being 30 degrees outside (not exagurating) while running down the interstate, it bLew so hot that I had to crack the window.. It wasn't BLOWING but air was coming through and it was hot air.

Like others have said, using the recirculate button fixes this because it changes the channel of air intake from outside to in the cabin where as outside air is being FORCED into the car while you're moving.

As others have stated, it is normal I'm afraid.

The power button only turns the FANS off, air however can still be pushed through the heater core from outside into the cabin of the car while you're moving, that inlet is not sealed off only because you turn it off.

My 99 Z28 does this as well... so its not a problem..its just how its designed.

[lt4camaro]

Originally Posted by Need4Camaro

I had this problem primarily with my 1LT V6 although not as bad with my 2SS. With the climate control powered off and the temp set to like 75 and it being 30 degrees outside (not exagurating) while running down the interstate, it bLew so hot that I had to crack the window.. It wasn't BLOWING but air was coming through and it was hot air.

Like others have said, using the recirculate button fixes this because it changes the channel of air intake from outside to in the cabin where as outside air is being FORCED into the car while you're moving.

As others have stated, it is normal I'm afraid.

The power button only turns the FANS off, air however can still be pushed through the heater core from outside into the cabin of the car while you're moving, that inlet is not sealed off only because you turn it off.

My 99 Z28 does this as well... so its not a problem..its just how its designed.

But you always have to turn the temperature all the way down or no matter where your re-circ is set the vented air coming thru the vents will always be heated.

[Navigator]

Good to know, but seems like a completely nonsensical design.

To me, "off" means off, and nothing should come through the vents, whether assisted by a fan or not.

Pretty weird to be driving around in 30 degree weather with the climate control off and still be roasting in my car.

Is this a Chevy/GM thing? This is my first GM car, and I've never had this issue on any previous car.

[Obzen]

Originally Posted by Navigator

Good to know, but seems like a completely nonsensical design.

To me, "off" means off, and nothing should come through the vents, whether assisted by a fan or not.

Pretty weird to be driving around in 30 degree weather with the climate control off and still be roasting in my car.

Is this a Chevy/GM thing? This is my first GM car, and I've never had this issue on any previous car.

Not a GM thing. This is the standard way car air systems work.

[Nsxmatt]

Originally Posted by Navigator

Good to know, but seems like a completely nonsensical design.

To me, "off" means off, and nothing should come through the vents, whether assisted by a fan or not.

Pretty weird to be driving around in 30 degree weather with the climate control off and still be roasting in my car.

Is this a Chevy/GM thing? This is my first GM car, and I've never had this issue on any previous car.

Every single car made the last probably 40 years does this. If the fresh air is open, air will come in the cabin if you are moving even when completely off. The temp of the incoming air is decided by the last temp you set it at when it was turned off.

[Norm Peterson]

Originally Posted by Navigator

To me, "off" means off, and nothing should come through the vents, whether assisted by a fan or not.

My guess is that the vents are not shut in order provide at least a little cabin fresh air ventilation when the car is moving. Otherwise humidity levels inside could rise and the windows become more likely to fog up especially in the winter or on a rainy day.

Pretty weird to be driving around in 30 degree weather with the climate control off and still be roasting in my car.

That's why you turn down the temperature setting, just like you would if you wanted the fan on and the air coming out was too hot. Same thought process, if it's too warm turn the heat down.


Norm

[lt4camaro]

Originally Posted by Navigator

Good to know, but seems like a completely nonsensical design.

To me, "off" means off, and nothing should come through the vents, whether assisted by a fan or not.

Pretty weird to be driving around in 30 degree weather with the climate control off and still be roasting in my car.

Is this a Chevy/GM thing? This is my first GM car, and I've never had this issue on any previous car.

Its a makes sense approach to un-complicate the system and always have ventilation in the car. Your are correct though, some systems work a little different, but you will never see a bunch of fogged windows like you do in the Japanese and European cars during the cooler /cold months.

[Low Saturn]

I had a similar issue with my 2011. Turning the fan to the off position never turned it completely off. And when on the fan would change speeds. Also, no matter what temperature it was set at when I turned the car off, full heat would come out of the vents at start up. I would have to turn on the A/C, rotate the knob to full heat, wait a few seconds, then rotate it back to full cold. The car did this 6 out of 10 times at start up.

Took it to the dealer a few times. They said they updated the software on the control module the first time which did nothing. Every other time I took the car in, they found nothing wrong.

It finally got fixed when I replaced the factory radio. Once I installed the Scosche dash kit, all the issues stopped. I had suggested early on at the dealer that the control face might be the issue, turns out it seems like it was.

[Bad Anvil Garage]

Originally Posted by lt4camaro

The electric grid power switch for the back glass should always default to off on a shut off and restart of the engine. Should always require manual activation after start up.

I agree... but my car doesn't. Sometime I look over and it's on and I know it was off before and I didn't turn it on. I'll have to inquire next time I'm at the dealer but I'm sure they'll just think I'm crazy.

[Nsxmatt]

Originally Posted by Bad Anvil Garage

I agree... but my car doesn't. Sometime I look over and it's on and I know it was off before and I didn't turn it on. I'll have to inquire next time I'm at the dealer but I'm sure they'll just think I'm crazy.

Mine will come on with remote start.

[NYJets12]

always wondered about this, when i drove the car home from the dealer when i bought it and shut the heat off it was getting hotter, i had to open the windows in november.
never had a car that did this.