I posted a few weeks ago about how my truck was warming up slow. Most thought I had a thermostat problem. Since the truck is over two years old, it was due an antifreeze change anyway, so I ordered a thermostat from Cummins. When I pulled the old thermostat out, the problem was obvious. One of the bottom flanges that holds the spring up was broken. I've changed a lot of thermostats, but never seen that before. It looks like it is designed to never fall completely apart and fall into the engine, but it sure made me wonder what would have happened if I had waited longer. I'm attaching a photo below. I hope everyone can open it.<br><br>Anyway, with the new thermostat the temp gage hits 180 after 6-8 minutes of driving and then cycles between 180 and 160. I've finally got some heat!!! :)

I had the same thing happen last Friday. What year truck did this happen on. I put a 190 in because the one I got from Auto Zone did not fit. Thank goodness Will at BMD had the cummins part in stock. I put it in and she stays at 190 and cycles a little below.

I had the exact problem. I think the construction on these must suck pretty badly to see so many fail the same way. I like how my truck heats up quickly now..<br><br>

This is true. I wish I would have kept my old one. I would have sent it with this thread. Who knows there are probably more out there. :(

Mine did the same thing about 2 months ago. :(<br><br>I replaced it with a Cummins T-stat and it's been working great. 8)<br><br>Did you compare the Cummins T-stat and the Mopar T-stat? If you did you noticed the difference in construction between the two, :o the Cummins T-stat is a lot heavier built than the Mopar T-stat.<br><br>DB

How long is a long time for warmup?? i'm trying to figure out &amp; if mine needs replacing....<br>&amp; is this warmup plugged in or not plugged in.....?<br><br>Thanks <br> DRecu!

Mine take about 8 miles to reach 190o @ 65mph, temps in the teens, and plugged in for 3 hours. I don't have any winter fronts yet.

<br>Mine take about 8 miles to reach 190o @ 65mph, temps in the teens, and plugged in for 3 hours. I don't have any winter fronts yet.<br><br><br>I guess i'm goon then by the time I get down our 10 mile backroad it's just starting to warm up not plugged in..... plugged in it's almost warmed up by the time I get there, 99's have a 180 T-Stat.<br><br>DRecu!

What kind of prices are you guys seeing? Dodge wanted 33.00 here in Spokane.<br><br>Mike

<br>What kind of prices are you guys seeing? Dodge wanted 33.00 here in Spokane.<br><br>Mike<br><br><br>If the dealer wants 33.00 for it, check with Cummins, it should be alot cheaper.<br><br><br>phox

Mine also came apart on bottom last october. Replaced warms up after 6-8 minutes now.

Mine's still stock at 68K with no problems... whaat am I doing wrong?? [laugh] [laugh]

I called Cummins today for a price and they wanted 54.00 for a thermostat! 21.00 more dollars than dodge wanted! They also wanted 13.40 for an LF3894.<br><br>Craziness!<br><br>Mike