Cooling System Flush - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Maintenance DIY/How-to's for maintenance of your car.

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post #1 of 21 (permalink) Old 09-13-2013, 02:50 PM Thread Starter
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Cooling System Flush

Has anyone flushed their cooling system? I know to use only distilled water but I didn't know if there was a "how to" on here.

I have a 2005 Chevrolet Cobalt 2.2L base coupe and the overfill reservoir has orange coolant in it.

Thanks!
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post #2 of 21 (permalink) Old 09-14-2013, 11:27 AM Thread Starter
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Anyone?



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2005 Chevrolet Cobalt 2.2L Base Coupe Automatic
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post #3 of 21 (permalink) Old 09-16-2013, 05:20 PM Thread Starter
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Bump....


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post #4 of 21 (permalink) Old 09-16-2013, 08:04 PM
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I flushed mine by simply opening the drain plug and letting a garden hose run through the resivor( I can't spell for shit right now sorry). I've heard to start the engine while the hose is running but I didn't.
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post #5 of 21 (permalink) Old 09-17-2013, 10:58 AM
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The orange coolant is called Dex-Cool. It's made specifically for the ecotec engines. You can use traditional green coolant, but the two don't mix well together. Other wise, change it the way you would any other car.....
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post #6 of 21 (permalink) Old 09-17-2013, 01:43 PM Thread Starter
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I see that there isnt a radiator cap to replace the coolant and burp the system. I can do all of that at the overflow tank correct?
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post #7 of 21 (permalink) Old 09-17-2013, 04:20 PM Thread Starter
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Getting to the drain plug sure is a pain in the ass


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post #8 of 21 (permalink) Old 09-18-2013, 10:53 AM
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Yes, & I cut out a small section in the black splitter for easier access to plug & drainage. Use a pair of tin snips - works the nuts.
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post #9 of 21 (permalink) Old 10-06-2013, 05:53 PM
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There is a plug at the back of the water pump pointing straight down. (On the Passenger side.) You can't see it front so you have to do it by feel. Take to plug out to completely drain the coolant. You can use a standard 3/8 short handled ratchet. I used 100% Prestone Dexcool for GM vehicles. (Orange)
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post #10 of 21 (permalink) Old 02-02-2014, 02:00 PM
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Pulling the lower rad hose works well too
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