2006 Chevrolet Cobalt Engine Overheating

Tiny
PHILLIPBRYANT001
  • MEMBER
  • 2006 CHEVROLET COBALT
  • 2.2L
  • 4 CYL
  • FWD
  • MANUAL
  • 110,000 MILES
Good morning y'all,

Last Thursday (11/6/14) I went to my local repair shop to have my inspection sticker renewed. The mechanic said that my vehicle failed inspection the first time around, and showed me the codes that were failing (and no my dumb self did not write down the codes when I should have). He offered to clear the codes, and told me to drive the vehicle around for a specified distance (I'm assuming to reset the drive cycle) and/or just bring it back on Saturday. I brought the vehicle back on Saturday (11/8/14) and the inspection passed.
So, I drove the vehicle with no noticeable issues until about Thursday (11/13/14). I tend to keep my coolant temperature gauge on while driving and noticed that the temperature was higher than normal (approx. 225F). I pulled over at my destination and surveyed the vehicle, and noticed that I was leaking coolant on the bottom left side of my radiator (when looking at the face of the vehicle). I also noticed that my ac fan wasn't turning on, and then later noticed that no matter how long I was driving the vehicle the lines running to and from my radiator remained cold, telling me that coolant was most likely not flowing. The liquid in my coolant reservoir is frozen (which tells me that there must be too much water in it, but please correct me if I'm wrong).
My first troubleshooting step was to check all of the lines for visible cracks or defects, which from what I can tell there are none other than just the one leak coming from somewhere on the bottom left side of my radiator. Second, I checked all of my fuses both under the hood and inside the cab in front of the passenger seat, and all of them are intact. The third thing that I noticed is that when I am driving, and begin to notice the engine overheating a fan kicks on somewhere around 220F. Now with that said I tried running the heater while driving, and noticed that the heat would last for a short while until the aforementioned fan kicks on, and then cool air follows. If I continue to drive then the hot and cold air will alternate along with the fan turning on and off. The fan I am referring to is not the fan directly in front of the radiator. That fan still does not turn on.
The last step that I took was to call the repair shop I originally went to so as to ask the mechanic for the codes that he showed my car displayed during the first inspection. He says that he doesn't have those codes, however after looking up my information he said something about my "evaporator" failing. I am still searching the internet for any and all suggestions for fixes, however any help is appreciated. Any and all time taken to review this issue is greatly appreciated, so please, thank you, and God bless.

Respectfully,

Phillip Bryant
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Saturday, November 15th, 2014 AT 9:14 AM

6 Replies

Tiny
HMAC300
  • EXPERT
Actually sounds like your coolant level is low and may be leaking other than the radiator. Have a pro pressure check your coolant system for leaks may be a head gasket.
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Saturday, November 15th, 2014 AT 9:48 AM
Tiny
PHILLIPBRYANT001
  • MEMBER
Thank you for your quick response. I feel I should add a few corrections to my original post. I brought my vehicle into my garage so as to defrost any ice in the system, along with putting a small space heater near the coolant reservoir to speed up the process near that area. While running the vehicle I noticed that when it reached approx. 220F the fan in front of my radiator turned on (contrary to what I said above). This tells me that the fan does work, however it doesn't work when I turn on either the heater or the a/c.
As far as having low coolant, I am waiting a while for the defrost to occur, and then I will check the level of coolant.
Again any and all time taken to review this issue is greatly appreciated. Please, thank you, and God bless.

Respectfully,

Phillip Bryant
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Saturday, November 15th, 2014 AT 10:13 AM
Tiny
HMAC300
  • EXPERT
Still sounds like low coolant and due to the ice in system you may have frozen the ware pump impeller and it may have come loose from the shaft. Don' t worry to much about the temp fan comes on because with low coolant it won't work correctly anyhow
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Saturday, November 15th, 2014 AT 10:38 AM
Tiny
PHILLIPBRYANT001
  • MEMBER
Thank you for your original suggestion. By chance do you happen to know on average how much that type of a check might cost me?
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Saturday, November 15th, 2014 AT 10:49 AM
Tiny
PHILLIPBRYANT001
  • MEMBER
Good afteroon,

Thank you so much for your original response, and I feel I have some good news. After allowing the vehicle to warm up a bit in my garage, and allowing any ice in the system to thaw I noticed that the coolant level was empty in the reservoir. I added some, let the fluid flow, and added more. After I ran the vehicle for a few moments I turned the engine off, and looked at the reservoir again. The level had dropped again, so I added more coolant, and ran the vehicle again. The a/c fan kicked back on like usual when I used my a/c and heat switches, along with the vehicle temperature not climbing very quickly. I am about to take it for a test drive just to make sure. So if I am not mistaken, I must have a leak, and as soon as I can I will take your advice by having a professional test for any leaks in the system. Thanks again, and God bless.

Respectfully,

Phillip Bryant
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Saturday, November 15th, 2014 AT 11:41 AM
Tiny
HMAC300
  • EXPERT
Thought that was the problem with the coolant. Hope you put a 50/50 mix of antifreeze in this time as well. Prices vary on labor so check locally
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Saturday, November 15th, 2014 AT 1:14 PM

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