Plenum gasket
 

99 ram 1500. 5.9. Just replaced the intake & plenum gasket. It fixed the issues I was having.... now the temp runs about 210 on a 30 min trip. Thought thermostat was bad so took it out.. currently no thermostat, cooling system is all open.. no blockage. Seems high to me... outside temp is about 60

Likely you still have air trapped in the cooling system somewhere. They are notorious difficult to bleed out...... Put a new stat in there, (stant, or similar brand please, skip the 'safety' stats, they suck.) and try again. Try and get the front of the truck as high as you can. Steep hill, or ditch, anything to get the radiator to be the highest point in the system.

Welcome to DF! :D

Moving this to second gen ram section for ya.

We have an approach going to the barn... I will have to try that once.... I've heard that could be the problem. didn't know how to get rid of it

Let us know how it turns out. :) Also, keep in mind, the temp gauges in these trucks aren't the most accurate things in the world...... :D

I can mess with it over the weekend... will definite update... thanks

I will say I never ever had a problem with these trucks.

Never had a problem until I did the intake gaskets

Even after I did my plenum. But now that I think about it my driveway is slightly up hill.

I recently did a plenum gasket, thermostat, thermostat housing, water pump and gasket and my temperature indicator always reads about 180 which is the type of thermostat I put in. Is there anyway I can make sure the temp readings are actually accurate so I’m not driving my truck at high temps and not realize it?

I have used an infrared thermometer at work when ever there's been doubt about temp gauge accuracy, or temperature of some component. Good place to measure would be around thermostat housing. And make sure that you have clean surface to measure.

Not too expensive tool:

https://www.homedepot.com/b/Electric...vZboffZ1z1180y