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<p>[QUOTE=&quot;ClayFl, post: 11747512, member: 327797&quot;]My truck has always idled sitting at around 150 degrees, now it’s idling at around 180-185. It would also run on flat ground around 150 and now it’s around 170. It regens at around 210 and then drops to around 195 when the fan kicks on. I replaced the thermostat out of caution cause it has 595K miles, but still does the same. Is this change ok, or is there something else that may be going on?&nbsp; It’s not throwing any codes. Thanks in advance for any advice.[/QUOTE]</p><p><br /></p>

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