The car reaches temp quickly, but the gauge on the open road generally shows at around 70 degree's when warm... it then rises to 90when the car is in slow moving traffic, or you put your foot down for a prolonged period, dropping to 70 again when at a sedate cruise...I don't see how this can be a thermostat issue, it does it at the end of a half hour drive the same as it does at the start.
Both fans were on full blast with the AC turned off... I'm thinking this new sensor must be bad. bad thermostats couldn't cause a stone cold engines fans to try and make the car take off, I'll order another sensor first and see if that solves it, unless anyone has a better idea..
Thanks for the help so far!