Forum Discussion
rgatijnet1
Dec 01, 2014Explorer III
You may have an air bubble in the radiator that is taking care of the expansion of the coolant.
The plastic tank is an overflow tank and is used to take excess coolant out of the radiator when the coolant is hot and allow it to suck back in to the radiator as the coolant cools down.
If there is any air in the radiator, it will not function as designed.
The normal operating temp of your coolant is around 200 degrees so driving through 117 degree heat should have a negligible affect on a properly operating cooling system.
You have an electrical cooling fan in the front of your radiator that comes on with the AC unit when the temperature increases in your cooling system.
There is also a fan clutch that will lock up your engine driven radiator fan when your coolant temperature reaches 107-110 degrees. This may only happen during a steep climb.
You should have been able to take off the radiator cap with the engine cool. You may have to press on it while turning it. It is probably a 15 pound pressure cap.
The plastic tank is an overflow tank and is used to take excess coolant out of the radiator when the coolant is hot and allow it to suck back in to the radiator as the coolant cools down.
If there is any air in the radiator, it will not function as designed.
The normal operating temp of your coolant is around 200 degrees so driving through 117 degree heat should have a negligible affect on a properly operating cooling system.
You have an electrical cooling fan in the front of your radiator that comes on with the AC unit when the temperature increases in your cooling system.
There is also a fan clutch that will lock up your engine driven radiator fan when your coolant temperature reaches 107-110 degrees. This may only happen during a steep climb.
You should have been able to take off the radiator cap with the engine cool. You may have to press on it while turning it. It is probably a 15 pound pressure cap.
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