Over heating after Antifreeze change

I changed my anti freeze (probably should have left it to the guy) and now my truck overheats. I removed about 9 quarts of old anti-freeze and got seven back in. Any help on why my truck is over heating is appreiated.

Dave

 

Did you burp the system? Sounds like you might have quite a bit of air still in there.

 

Yes, air is the likely culprit.

 

Not sure how to burp it

 

Pull your radiator cap off and run it until the thermostat opens, then add to capacity. Burped.

 

disconnect the heater hose at firewall and fill the hose with as much coolant as you can and quickly reconnect it, that gets most of the air out, then with you heater on full heat, after truck has warmed up so your thermostat is open, run the engine at around 2k rpm to push out any remaining air from the heater core. recheck coolant levels after a day or two and top off if needed.

 

As stated, air.. Next time it would be beneficial to understand how to do a procedure before you attempt it. Google and Youtube are your friends.

 

open the radiator cap and just let it run. if you can elevate the front end on blocks or run it up on a parking brick. doesnt need much. crank the heat in the truck and set the fan on full blast. your thermostat will open and allow full flow into system. fill to capacity and add enough fluid for the overflow tank.

been a mechanic about a decade.

 

Set your hvac to full heat, so the coolant will go back through your heater core (it likely emptied when removing old coolant) when thermostat opens once engine gets to operating temp. As stated above, try to park with nose of truck on as much incline as possible. This is so the radiator neck is your high point in the coolant system. The air has a better chance of working it's way out of the system this way. Let it sit and run while making sure you don't overheat and keep filling it up at radiator neck until it's as full as you can get. Can take 20 minutes of thermostat cycling open and closed. If there is more air left in system, it should be able to make it's way out on it's own with following drive cycles.

 

Thank everyone for the quick replies. Followed you advice and all is good now. The forum has helped me several times.

 

Here's a video for people to follow to do a cooling system flush and properly burp the system of air.

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