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Jeep Wrangler JK
JK General Discussion
P0128 Code
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<blockquote data-quote="Anybodyhome" data-source="post: 436632" data-attributes="member: 19161"><p>Update:</p><p>Easily fixed this morning. Replacing thermostat was quick and easy and once finished, I fired up the Rhino and JScan while watching the new T-stat for any leaks, checking the temp gauge as well.</p><p>Initial issue was the coolant temp was reading 185-190 tops and I was forever getting the P0128 code. I diagnosed as a stuck open t-stat based on all the info I had.</p><p>The upper radiator hose remained cool and when the coolant temp hit 217, I felt the t-stat open and the coolant temp dropped to about 199 and remained consistent, and this while in the driveway.</p><p></p><p>Here are pics of the t-stat I replaced. You can see the discoloration and surface corrosion, which is why it was probably stuck open.</p><p></p><p>One other note: I checked 3 different sources for the 10mm bolt torque specs, and one of those sources incorrectly specified 108 foot pounds. It's actually 108 inch pounds. You'll break the bolts if you try to get 108 ft lbs.</p><p>Hand tight, no more.</p><p></p><p>[ATTACH=full]118421[/ATTACH][ATTACH=full]118422[/ATTACH][ATTACH=full]118423[/ATTACH]</p></blockquote><p></p>
[QUOTE="Anybodyhome, post: 436632, member: 19161"] Update: Easily fixed this morning. Replacing thermostat was quick and easy and once finished, I fired up the Rhino and JScan while watching the new T-stat for any leaks, checking the temp gauge as well. Initial issue was the coolant temp was reading 185-190 tops and I was forever getting the P0128 code. I diagnosed as a stuck open t-stat based on all the info I had. The upper radiator hose remained cool and when the coolant temp hit 217, I felt the t-stat open and the coolant temp dropped to about 199 and remained consistent, and this while in the driveway. Here are pics of the t-stat I replaced. You can see the discoloration and surface corrosion, which is why it was probably stuck open. One other note: I checked 3 different sources for the 10mm bolt torque specs, and one of those sources incorrectly specified 108 foot pounds. It's actually 108 inch pounds. You'll break the bolts if you try to get 108 ft lbs. Hand tight, no more. [ATTACH type="full" alt="T-stat 1.jpg"]118421[/ATTACH][ATTACH type="full" alt="T-stat 2.jpg"]118422[/ATTACH][ATTACH type="full" alt="T-stat 3.jpg"]118423[/ATTACH] [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
P0128 Code
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