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post #1 of 16 (permalink) Old 02-18-2010, 06:32 AM Thread Starter
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Hello Everybody!

I've had a 2005 Cobalt since it was new. I'm just joining today to see if anyone has any ideas about a problem with my heater. I wasn't quite sure which forum that best fits into?
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post #2 of 16 (permalink) Old 02-18-2010, 06:36 AM
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Quote:
Originally Posted by Non-Mechanic View Post
I've had a 2005 Cobalt since it was new. I'm just joining today to see if anyone has any ideas about a problem with my heater. I wasn't quite sure which forum that best fits into?
Welcome to YC.com!

What seems to be the problem with your heater?




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post #3 of 16 (permalink) Old 02-18-2010, 06:38 AM
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post #4 of 16 (permalink) Old 02-18-2010, 06:39 AM
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welcome to our home! ya have any pics?



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post #5 of 16 (permalink) Old 02-18-2010, 06:41 AM
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post #6 of 16 (permalink) Old 02-18-2010, 07:05 AM
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post #7 of 16 (permalink) Old 02-18-2010, 07:08 AM Thread Starter
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Originally Posted by Cobaltxfe09 View Post
Welcome to YC.com!

What seems to be the problem with your heater?
Thanks! The problem is that it seems to blow cold air only with the heater on and after running for nearly an hour.

Some background: About 2 months ago, it started doing this intermittently but when that happened, it would flip to hot after about 20 min. or so (and it would be a sudden change). It has been warm for the last few weeks with no return of this problem until last night. Then, it didn't change back to hot at all. Eventually, I was stopped for just a few minutes and came back and turned it on to find it was hot. When I turned the fan up, it went back to straight cold air and hasn't been back since (regardless of fan speed).

I checked the coolant level cold this morning and it is not low. Then after about a 45 min. drive it was still blowing cold air.

---------- Post added at 09:08 AM ---------- Previous post was at 09:07 AM ----------

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welcome to our home! ya have any pics?
No, sorry. I don't really do pics much at all (not of myself either), so the only camera I even have is my cell phone camera (no flash on my Treo, either).
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post #8 of 16 (permalink) Old 02-18-2010, 07:11 AM
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Quote:
Originally Posted by Non-Mechanic View Post
Thanks! The problem is that it seems to blow cold air only with the heater on and after running for nearly an hour.

Some background: About 2 months ago, it started doing this intermittently but when that happened, it would flip to hot after about 20 min. or so (and it would be a sudden change). It has been warm for the last few weeks with no return of this problem until last night. Then, it didn't change back to hot at all. Eventually, I was stopped for just a few minutes and came back and turned it on to find it was hot. When I turned the fan up, it went back to straight cold air and hasn't been back since (regardless of fan speed).

I checked the coolant level cold this morning and it is not low. Then after about a 45 min. drive it was still blowing cold air.

OK, well thats weird. Ummm, how many miles are on the car. What model Cobalt is it, LS, SS..??

Could be the thermostat. Are you getting any codes/engine lights.




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post #9 of 16 (permalink) Old 02-18-2010, 07:30 AM Thread Starter
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OK, well thats weird. Ummm, how many miles are on the car. What model Cobalt is it, LS, SS..??

Could be the thermostat. Are you getting any codes/engine lights.
It has around 90K miles, and it's an LS - 4 door if that matters. I'm not getting any messages, but as you might guess I don't have any type of computer that mechanics plug in to see more errors. The coolant temp that shows in the driver info screen has always been mid to upper 190's, but it was around 187-189 last night and this morning. To be fair, it has been cold outside (I live in Iowa) but it usually isn't quite that low even when it's been a bit colder outside (but 187 doesn't seem way off to me).
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post #10 of 16 (permalink) Old 02-18-2010, 09:36 AM
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iowa... Sounds like another snowcovered landscape to me.

1. Did you do ANY work under the hood, or any electrical work prior to this happening?-use ur noggin and remember!
2. Did any SHOP OR MECHANIC do any work or scheduled maintenance prior.....?

3. Does the vent knob route air properly? I.e.-feet, windshield, feet n cab, and cab?

*this isn't a faulty sensor or something electrical is it YC?-sounds like some kind of internal ac problem, like the hot air isn't getting routed to the vents (hopefully)
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