Chevrolet Cobalt Questions

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Have been experiencing a water leak on my 2005 cobalt. The leak is coming from the A peeler on the front passenger door. I have cleaned out the vent, wheel well vent, changed/replaced the plastic by the windshield. The leak does not occur when I have my AC unit on. It only leaks when it rains. My cobalt has a sun roof could the leak becoming from there?
One time when I start car the vent fan works and the next time it does not
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I checked the #10 fuse and its ok
AutoZone says the OEM code is P0010
Something about needing to replace the intake camshaft acturator solenoids. Our Mec says we need two. Can you tell me how much this should cost? Thanks
The car is so loud! It sounds like a giant bumble bee is following me. My brother said I need to get the flex pipe replaced. There is a very faint smell. I called around and the prices were so different. I don't want to be ripped off. If I leave this problem for too long can it cause other issues?
My 2006 Cobalt won't start every time when it's warm outside but starts every time when it's cool outside. I have to sit there and keep trying every few minutes and it will finally start. It did this last summer too.
I replaced the passenger headlight with a brand new one and the directional light is out after a few days and now my drivers side headlight is out now. So I think that theres something electrical wrong. What do I do and How much will it cost to fix?
Its making a sound (if you put a card in a bike tire and ride it, that sound it makes) thats the sound its making. It was running okay just making that sound... today as i'm driving, it wont switch gears its just redlines the whole time and the sound gets louder and worse and then when i step on the gas it does nothing and has no power through the gas pedal at all but i have power on everything else... My check engine light is on.. Help?!?!?
The first time it happened the car would not turn on at a gas station, it then turned on and I was able to drive a few feet to a friends house before the engine disabled. I had to get it towed home. I took it to the shop they said it was the battery. Car was fine for a month (weather was cool).
It kept happening and I kept charging the battery. I then took it the shop because they felt it was the alternator. nothing wrong with the alternator or battery. Then I noticed that the issue seem to happen during the hot part of the day. And after I stopped during stop signs and traffic. I also notice the temp of the car is warmer. And the mechanic had said that he could not read the codes cause the ecm switch was blown. He replaced the fuse and it turned on but it happened again. this time I noticed I didn't have to charge the car for the check engine light to go off. It just had to be nice and cool. Like night time or early morning.
I am taking in but is it worth it? Am I wasting my money?
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