2009 Grand Caravan SE: Coming out of Boston about a month ago I noticed that my temp gauge had gone dead & a check engine light as well as a red electrical (square with lightning bolt) warning light was on. It was a cold evening; I had been keeping an eye on gauges & I knew that beforehand the...

I just joined this forum out of desperation. I have a 1999 Chrysler Voyager with the 3.3 V6 that ONLY overheats on the freeway. The van has 139,000 original miles. Rebuilt trans. Runs perfect.....except for this new issue. What I have done: 1) Replaced thermostat. 2) Replaced temp sending unit...