Get a 195 stock thermostat if everything else is stock on your truck. 180 stat requires a tuner and thermostat probably isn't the the reason your heater won't put out. Could try back flushing your heater core, more than likely it's a heater core problem. The gauge on my truck sits just about half way between the 130 and 210, maybe a little closer to the 210 mark. That's with a 195 stat. Oh, and if you do a search you'll find plenty of info on changing it out if need be.
Last edited by ReadRam; 02-10-2013 at 10:54 PM.