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Jeep Wrangler JK
JK General Discussion
P0128 Code
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<blockquote data-quote="Anybodyhome" data-source="post: 441717" data-attributes="member: 19161"><p>No problems whatsoever.</p><p></p><p>1 of 2 things is happening when your temp is getting to 226 and dropping- either that's when the t-stat is opening and allowing coolant to flow and the temp drops...</p><p>OR</p><p>the fan is coming on and cooling the temp</p><p></p><p>When I was testing to see if my t-stat was stuck open, I started the Jeep cold and wrapped my hand around the upper radiator hose. If the radiator is operating correctly, you should feel no temp increase, nor should you feel any coolant flowing through the hose. When the t-stat opens, you'll feel the flow of coolant and that's when the hose will begin to warm up as the coolant is then cycling thru a hot engine. I had my phone right in front of me with my hand wrapped around the hose and I was watching the engine temp rise on JScan. Once I replaced the t-stat and housing, I duplicated this and, again with my hand wrapped around the upper hose, I could feel the t-stat pop at the correct temp and began feeling the flow of coolant thru the hose. </p><p></p><p>If your temps are reaching 226, I can guarantee you the t-stat is not stuck open. If the t-stat is stuck open, you feel the flow of coolant immediately and it will get warm within a few minutes. With just close to enough coolant in the system, there's little chance the temp gets beyond 200 because the coolant is remaining in the engine block and is immediately cycling as soon as the engine is started. </p><p></p><p>My t-stat was stuck open, the temps never went above 190 and I had a CEL light. I used my JScan to catch the code and went to work from there. By the way, I believe the JKU t-stat is set to open around 200-205.</p></blockquote><p></p>
[QUOTE="Anybodyhome, post: 441717, member: 19161"] No problems whatsoever. 1 of 2 things is happening when your temp is getting to 226 and dropping- either that's when the t-stat is opening and allowing coolant to flow and the temp drops... OR the fan is coming on and cooling the temp When I was testing to see if my t-stat was stuck open, I started the Jeep cold and wrapped my hand around the upper radiator hose. If the radiator is operating correctly, you should feel no temp increase, nor should you feel any coolant flowing through the hose. When the t-stat opens, you'll feel the flow of coolant and that's when the hose will begin to warm up as the coolant is then cycling thru a hot engine. I had my phone right in front of me with my hand wrapped around the hose and I was watching the engine temp rise on JScan. Once I replaced the t-stat and housing, I duplicated this and, again with my hand wrapped around the upper hose, I could feel the t-stat pop at the correct temp and began feeling the flow of coolant thru the hose. If your temps are reaching 226, I can guarantee you the t-stat is not stuck open. If the t-stat is stuck open, you feel the flow of coolant immediately and it will get warm within a few minutes. With just close to enough coolant in the system, there's little chance the temp gets beyond 200 because the coolant is remaining in the engine block and is immediately cycling as soon as the engine is started. My t-stat was stuck open, the temps never went above 190 and I had a CEL light. I used my JScan to catch the code and went to work from there. By the way, I believe the JKU t-stat is set to open around 200-205. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
P0128 Code
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