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My Cobalt just came back from the shop and a few days out of it, any time I fire it up, the interior fans turn on to level 3 although the system is turned off. Could it be a blown fuse? I normally don't have the fans on at all, so it's annoying that I can't turn them off.
 

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My Cobalt just came back from the shop and a few days out of it, any time I fire it up, the interior fans turn on to level 3 although the system is turned off. Could it be a blown fuse? I normally don't have the fans on at all, so it's annoying that I can't turn them off.
A blown fuse wouldn't allow the fan to come on. The wiring to the switch or a regulator problem is my educated guess.
 

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Ironically enough, as quickly as it started, the problem went away on its own. Still a tad confused, but we'll let it slide this time...
 

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If I am not mistaken there is a relay for the blower so my guess is it got stuck and got jarred loose on its own.
 

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If I am not mistaken there is a relay for the blower so my guess is it got stuck and got jarred loose on its own.
My neighbor manages the garage it was repaired at, and he's never heard of this problem. But he did mention it sounded like the relay, so I might have him take a look at it.
 

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Aaaaand the problem is back, but only intermittently. Apparently it's a rare problem that no garage has ever heard of. WTF is going on?! Haha.
 

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Aaaaand the problem is back, but only intermittently. Apparently it's a rare problem that no garage has ever heard of. WTF is going on?! Haha.
If it is that rare, and you manage to find a solution for it, make sure to post if here so somebody else who has the same problem may found that your solution could also work for them. Other than that, does the speed of the fan change when you adjust the knob of the HVAC panel?
 

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Fans

I don't know what a HVAC fan is but, I know when I turn my key in my 06 chevy cobalt air blows out of my vents very loudly. They come off in on, more on than off it seems. I have my ac turned off. Now I've noticed that my deforst and floor vents do not work at all. Did you find a resolution? I hate to take it to the shop and it be something simple.
 

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NikiB (and anybody – open invitation),

If I can be of any assistance as a Customer Service representative, whether it be working with you towards resolving a vehicle concern with a dealership, or looking into warranty/recall information, please don’t hesitate to private message me with more information!

Best,
Sarah
GM Customer Service
 

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I think you both have heater assembly resistor network problems. The most common symptom is fan goes to high speed and won't give you any options but off and even that sometimes doesn't work. Depending on where the broken wire resistor falls on which contacts.
 
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