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Jeep Wrangler JK
JK General Discussion
Overheating
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<blockquote data-quote="Oscar-Mike" data-source="post: 423295" data-attributes="member: 17486"><p>No there is no head gasket problem and that is how the cooling system should work. But just for your peace of mind, when you stop the engine go and check the dipstick if it's milky - that is a sign of head gasket leak.</p><p></p><p>The reservoir is getting emptier because when the engine is hot (you reached 245 degrees) the thermostat kicks-in and activates the pump to flow more coolant and during this time there is expansion in the fluid, as a result the rad fluid will rise up and will kick out and blow air bubbles to the reservoir.</p><p></p><p>As a result the engine cools down because of these new fresh coolant (you said it reached down to 208 degrees) that is all good because now he is receiving and flowing fresh coolant through the cavities. The rad sucks back fluid from the reservoir as the engine cools down (fluid will decompress). That is why you see coolant disappears from the reservoir.</p><p></p><p>That is how the cooling system should work and just keep an eye on the reservoir not to get empty because if it is empty when it cycles, the rad will suck all the air back into the system and that is bad.</p><p></p><p>It's thermodynamic cycles and when it does, it gradually stabilize the cooling/heating system and this process does not happen overnight by the way because it needs a series of cycles to stabilize a process.</p></blockquote><p></p>
[QUOTE="Oscar-Mike, post: 423295, member: 17486"] No there is no head gasket problem and that is how the cooling system should work. But just for your peace of mind, when you stop the engine go and check the dipstick if it's milky - that is a sign of head gasket leak. The reservoir is getting emptier because when the engine is hot (you reached 245 degrees) the thermostat kicks-in and activates the pump to flow more coolant and during this time there is expansion in the fluid, as a result the rad fluid will rise up and will kick out and blow air bubbles to the reservoir. As a result the engine cools down because of these new fresh coolant (you said it reached down to 208 degrees) that is all good because now he is receiving and flowing fresh coolant through the cavities. The rad sucks back fluid from the reservoir as the engine cools down (fluid will decompress). That is why you see coolant disappears from the reservoir. That is how the cooling system should work and just keep an eye on the reservoir not to get empty because if it is empty when it cycles, the rad will suck all the air back into the system and that is bad. It's thermodynamic cycles and when it does, it gradually stabilize the cooling/heating system and this process does not happen overnight by the way because it needs a series of cycles to stabilize a process. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Overheating
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