Join Date: Jun 2001
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Re: 258 temp vs. 4.0 temp
A 4.2 uses a 195 degree thermostat, and a 4.0 is a 192 degree unit. 3 degrees doesn't mean much, So, both engines should run at around 200-215 (210 seems to be the average)
I'd verify the the temp with an accurate thermometer, but chances are your old engine had the wrong thermostat, people love to mess with them. [img]/wwwthreads_images/icons/smile.gif[/img]
Another thought is that you may have a better ground connection now and the guage is now reading normal, but was reading low with the old engine and crappy ground connection.
The halfway point on the guage is about 195, so if it's working correctly, you're probably around 210, which is perfectly normal for a 4.0.
'97 Sidekick Sport