Truck has no heat while driving down the road ... why?

The tempo goes to almost 210 and the thermostat opens and it drops to 180 and stays there... if you start driving the temp drops a little past 180 but is you stop its goes back up to 180/190 area and then I have heat

ASE Master, define local. Your in WI, the vehicle is in NY!

Not too sure why it says that I'm from a little town called ancramdale ... new York state lol

Wondered about that myself. I guess you have needed that heater lately. Here in VA too!!

Sorry guys, I mixed locations with a previous..... It sounds low on antifreeze by thr 30 degrees difference of opening and running.... I agree with Pushrod, have it checked out!! The temps lately have been brutal! Hope we all get warm weather soon

No problems, except the heater of course!

I just picked one up from the nearest parts store I have to Tahoe's 1 is a 95 and the other is a 99 and they both run at the same temperature which is 180 degrees

i think it should be a 195 if im not mistaken.where does your temp gauge read?

It reads in between 100 and 210 like directly in the middle of that