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

Any scanner (even the chain stores ones) can show you what the PCM sees as the temperature

Well I put the truck on the barn approach, ran the idle up a little and watched the coolant in the radiator... have quite a bit of bubbles..... went for an hour drive... so far temp is running lower. Granted the outside temp is now in the 40s.. will see again when it warns up. Thanks all for the imput

I just had that problem today actually 85° temps and it was right under 200° (I have a 180° thermostat and it is always at the quarter mark). Bought some distilled water topped it off and it's back to normal.

Plenium/intake
 

So I replaced the plenum and intake. Was having an issue with it running hot... now I have a #8 misfire and TCC comes up on my scanner... runs like ****...any help is appreciated

The plenum has nothing to do with it running hot. I would check the connections maybe you bumped something

I also had a misfire after a plenum fix. I had bumped and disconnected a spark plug wire boot from the distributor. check all of them carefully making sure to feel each one is securely connected.