2004 4.7 Durango with 140,000 miles just replaced fan clutch (went bad quit working) and replaced it new and it stayed engaged not just free spinning it's fully engaged (drove it for a month just to see if it would free up). Thought something was wrong so replaced it again and the new one still stays fully engaged all the time as well. Have replaced thermostat prior to fan clutch. Runs about halfway up the gauge so it not running hot causing it to stay engaged. What should I check next?