What else could be wrong?

10

Asked by May 24, 2017 at 12:56 PM about the 2008 Chevrolet Cobalt LS Sedan FWD

Question type: Maintenance & Repair

I have an 08 Chevy Cobalt. I've replaced the thermostat, the top radiator
hose, had a shop replace the radiator. My car is still over heating (getting
up to 240 degrees F) the water will boil in my reservoir tank. I'm not getting
heat, so we thought it was just a bad heater core so we bypassed it. I've
replaced the cap to my reservoir tank thinking maybe it wasn't getting
enough pressure.

20 Answers

2,315

Check this YouTube video out. It is a common Cobalt problem https://www.youtube.com/watch?v=EzQZbGp14ro

2,315

If that is connected okay.... then have u noticed any leaks coming down from the water pump. That would be my next guess

1 of 1 people found this helpful.
10

I don't know where he water pump is exactly. I don't have a whole lot of leakage. It'll steam a lot, but it doesn't smoke and that comes from the overflow tank.

1 of 1 people found this helpful.
2,315

Your cooling system needs to be under vacuum...otherwise it will boil. Let's try an inexpensive fix next.....replace your radiator cap at AutoZone.....they will do it for u...no cost, if you ask. Should cost between $3.00-5.00

2,315

The water pump usually leaks from an old seal or the bearing goes bad....and the car keeps overheating. That would be the next thing to check after placing a new radiator cap on it

10

Are you talking about the overflow cap? I tried that last night as well. I'm supposed to be having it towed to a show tomorrow. I'm just a little nervous that it's gonna be a head gasket.

2,315

There is a cap on the radiator that must maintain vacuum. There is a cap on the plastic overflow container....no need to change. If it is the head gasket.....then u will notice white smoke in your rear tail pipe. That is the first sign

2,315

As you are driving and the car overheats......have u tried turning on the heater to max? That usually kicks in some cold water//antifreeze and may give you a few minutes more driving before you should stop. If that water temp needle is in the red.....then pull over....don't drive. You will be adding more cost to ur repair

10

I just had a shop replace my radiator, as far as I know there's no way for me to get to it without removing the entire thing. There's no smoke coming out of the tail pipe. I don't have any heat. We bypassed the heater core because it wasn't giving me heat.

96,155

Have you purged air out of the cooling system? There are good videos on this subject on Youtube. Your radiator actually operates under pressure, not vacuum. Try adding some Water Wetter by Redline which should reduce the operating temperature noticeably.

1 of 1 people found this helpful.
10

I haven't, I assumed the shop had done all that.

2,315

What shop did u take it to? You can narrow down to a certified shop.....such as AAA roadside service....u need a membership. If I am ever broken down....they tow and have a current list of AAA certified shops. They work hard to get this accreditation. Just in case you are not happy w your current shop.

10

We used my boyfriends moms shop. I'm having AAA tow tomorrow, but it's not my membership.

2,315

It's okay.....make sure u get their recommendation for a AAA shop....even if it isn't ur membership...u can still use the shop....they are more honest, and less likely to be ripped off

2,315

No disrespect to ur future mother in laws shop.....they may just specialize in foreign cars.....or Mercedes Benz's. They may not know about Cobalts.

96,155

You have two problems - your car and your future in laws.

1 of 1 people found this helpful.
10

You're not wrong about my future mother in law. Haha I'm having it towed to the same place that changed the radiator. I'll find out if they burped it, if so then I guess we go for round two. I've never had an issue my dad hasn't been able to fix and he's stumped. Unfortunately this is getting really expensive and I'm running low on money. I just hope whatever it is isn't going to be crazy.

96,155

Good luck with your problems. You may have to have a pact of silence with the BF when you take your car for service at another shop.

2,315

Is this auto shop a place that your BF's mom just uses....or is it her own shop that she runs!?!

10

She just uses.

Your Answer

Cobalt

Looking for a Used Cobalt in your area?

CarGurus has 231 nationwide Cobalt listings starting at $1,000.

Postal Code:

Chevrolet Cobalt Experts

  • #1
    lightGear
    Reputation
    1,210
  • #2
    munron
    Reputation
    1,180
  • #3
    dandyoun
    Reputation
    1,000
View All

Related Models For Sale

Used Chevrolet Malibu
84 Great Deals out of 1,809 listings starting at $2,495
Used Honda Civic
275 Great Deals out of 4,702 listings starting at $2,700
Used Ford Focus
82 Great Deals out of 2,487 listings starting at $990
Used Ford Mustang
991 listings starting at $3,900
Used Chevrolet Impala
141 Great Deals out of 1,103 listings starting at $1,995
Used Toyota Corolla
143 Great Deals out of 3,485 listings starting at $2,495
Used Honda Accord
47 Great Deals out of 1,209 listings starting at $1,795
Used Dodge Charger
60 Great Deals out of 742 listings starting at $2,950
Used Chevrolet Silverado 1500
197 Great Deals out of 12,244 listings starting at $2,750
Used Nissan Altima
70 Great Deals out of 1,256 listings starting at $999
Used Toyota Camry
48 Great Deals out of 2,120 listings starting at $2,750

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.