As we prepare for a blizzard tomorrow, I took some time to do a bit of wrenching on the Dakota. I had been suspicious of a stuck open thermostat since I bought the truck, so about a month ago I bought everything I would need to do a coolant flush as well as replace the thermostat and housing.
The thermostat is not as easily accessed as I had been expecting, as it's down behind/between the alternator and a/c compressor and their mounting brackets. I decided to swing the alternator out of the way to help a bit with access. I removed the upper rad hose, thermostat housing, and old thermostat and cleaned the gasket surface on the engine side.
I slapped some thermostat/water pump (gray) RTV sealant on the intake, lined up the gasket, installed the new 195* thermostat, added more RTV to the the housing, and fastened it down to the spec'd 17 ft lbs in a few stepped increments. Next, I drained the radiator and flushed it with water, then ran a Prestone cooling system flush through the system for about 45 minutes while I went inside to warm up. I flushed that, did another water flush, and then filled the system with a 50/50 coolant mix.
At this time I figured it would be a good idea to address an intermittent squeaky pulley I had been hearing, so I r&r'd the idler pulley and tensioner assembly. I cleaned all the remaining pulleys with brake clean as well. I don't know for sure which was squeaking, but I suspect it was the idler as I could feel a slight rough spot in the bearing when I removed it. I also replaced the belt because why not.
I took it on a quick test drive which was noneventful, and here is where the temp gauge now rests:
Contrast that with where the temp gauge sat after a 2.5 hour drive home after I bought it:
I'm happy with these results and the cab is warmer too! To finish off this little pre blizzard tune-up, I wanted to check the transfer case fluid level because as the previous owner disclosed prior to the sale, it leaks. I removed the fill cap and found it to be low, so I then had to rig up a transfer pump. I cleaned out a recently emptied body wash bottle, created a barb-like shape on the nozzle with the belt sander, and pushed some soft tubing I had laying around (+1 for keeping junk around!) and it worked really well to top off the transfer case. I will however, accept recommendations of a purpose built tool for next time ha. It only ended up needing about 1/8 qt to fill up.
Now bring on the snow! I've heard reports ranging from 4" to 2', so we will see!