2011 explorer 3.5 overheating

[vsuarez82]

2011 explorer 3.5 with 240k miles. I had no issues until I decided to change the coolant. Drained from the radiator, filled it up at the reservoir and burped it about 10 times. Now it's been a week and in the mornings when it's not hot, I can make it to work no problem and no overheating, but when I park it the hoses are full with pressure, I turn the heater on and the pressure goes down. After work and over 100 degrees. I can make it a few miles until it over heats. Or I crank on the heater and the temp goes down and I make it home. Yesterday I replaced the thermostat and still the same problem. Every time I turn on the ac the pressure builds up and starts to overheat, with the heater on its fine. Any suggestions.

 

[FordFlintrock]

Due to the designs of modern cooling systems when just refilling there is a likelihood of getting air bound. This item is a must have for trouble free filling.

Amazon.com

 

[utilitytristin]

Probably air in the system somewhere

 

[peterk9]

2011 explorer 3.5 with 240k miles. I had no issues until I decided to change the coolant. Drained from the radiator, filled it up at the reservoir and burped it about 10 times. Now it's been a week and in the mornings when it's not hot, I can make it to work no problem and no overheating, but when I park it the hoses are full with pressure, I turn the heater on and the pressure goes down. After work and over 100 degrees. I can make it a few miles until it over heats. Or I crank on the heater and the temp goes down and I make it home. Yesterday I replaced the thermostat and still the same problem. Every time I turn on the ac the pressure builds up and starts to overheat, with the heater on its fine. Any suggestions.

Welcome to the Forum.

Peter