2004 / 4.0 / OHC

Do I REALLY need to take off the intake to replace the t-stat? I was hoping there was a shortcut around doing this, so, Im asking you all if there is. The reason for me thinking T-Stat is needing replaced is due to 130,000 miles and on colder days, temp on the gauge is showing that after it opens for the first time, it wont get back up to operating temp. Its acting as though the T-Stat is then stuck open after it heats up.

Thanks to all that can help /reply.

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2004 Ford Ranger XLT / 4x4
4.0 V6 / Denver, CO.