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Jeep Wrangler JK
JK General Discussion
2008 JK coolant reservoir bubbling
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<blockquote data-quote="james6873" data-source="post: 429459" data-attributes="member: 19771"><p>****!!!!FIXED!!!!**** basically what I assume was happening is that</p><p></p><p> </p><p></p><p><strong><span style="color: rgb(65, 168, 95)">*******!!!!!!!FINALLY FIXED!!!!!!!******* </span></strong></p><p><strong></strong></p><p><strong>REPLACED ECT SENSOR.</strong> Basically what i assume was happening was the engine coolant temperature sensor was reading about 30-40 degrees lower than it should- not completely broken just a little off. (which is why it wouldn't show on OBDII). This was allowing the coolant to reach its boiling point before the fan kicked on which made it seem like there was air entering the system, but it was just the coolant boiling and creating pockets of coolant vapor. (all while my temp gauge was reading normal). I replaced the ECT sensor and the fan now turns on while idling/slow traffic. I didn't even realize the fan wasn't turning on because at highway speeds (35mph+) the fan doesn't need to kick on and it wouldn't boil over. Thats why it seemed to "randomly" happen. Thank you so much to <strong>[USER=19674]cpwolf[/USER] </strong>for the PDF and the solution.</p></blockquote><p></p>
[QUOTE="james6873, post: 429459, member: 19771"] ****!!!!FIXED!!!!**** basically what I assume was happening is that [B][COLOR=rgb(65, 168, 95)]*******!!!!!!!FINALLY FIXED!!!!!!!******* [/COLOR] REPLACED ECT SENSOR.[/B] Basically what i assume was happening was the engine coolant temperature sensor was reading about 30-40 degrees lower than it should- not completely broken just a little off. (which is why it wouldn't show on OBDII). This was allowing the coolant to reach its boiling point before the fan kicked on which made it seem like there was air entering the system, but it was just the coolant boiling and creating pockets of coolant vapor. (all while my temp gauge was reading normal). I replaced the ECT sensor and the fan now turns on while idling/slow traffic. I didn't even realize the fan wasn't turning on because at highway speeds (35mph+) the fan doesn't need to kick on and it wouldn't boil over. Thats why it seemed to "randomly" happen. Thank you so much to [B][USER=19674]cpwolf[/USER] [/B]for the PDF and the solution. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
2008 JK coolant reservoir bubbling
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