Dorman 902-852 Engine Coolant Thermostat Housing Assembly Compatible with Select Dodge / Jeep Models

After getting a check engine light on my jeep wrangler , I was able to read the code and found it was a P0128 code indicating the engine was running cooler than expected. This could indicate a thermostat that was stuck open. To further verify that the thermostat was the culprit I used my ODB2 scanner to monitor the coolant temp. With the engine idling in my driveway, the original thermostat was cycling the coolant temp between 190 and 200 degrees which seems a little low for the 3.6L Pentastar engine as that thermostat should just start to open at 203 degrees and reach fully open near 215 degrees. My cabin heat, while ok, was also just not as hot as I was used to.This thermostat install is a relatively simple procedure and there's already a gasket installed on the replacement. I cleaned up the mating surface on the engine with a green scrubby pad to help insure a leak free seal. I also used a small bicycle sized torque wrench to reinstall the bolts and torqued to 105 inch lbs. This is just a little over 8 foot lbs - don't get these mixed up. So the bolts are snugged up nicely but do not need to be cranked super tight.With the new thermostat installed, the coolant temp is now cycling between 200 and 213 degrees. The P0128 code is also gone, and the cabin heat is back to its normal "nice and hot".Make sure you have the proper coolant to add back in to your radiator as you will probably lose 1/2 gallon or more minimum.

Works as Decribed, seems of good quality

It's very easy to install. There are a bunch of videos on YouTube that walk you through this. It took about 10 minutes to install. Make sure that you have a radiator burping funnel, as air will definitely get into the system. Let the jeep run with the funnel one with antifreeze in it, and the air will come right now. It takes longer than you think.Also, on the 2014 Wranglers, you must reset the code to remove the check engine light. Will NOT go off on its own.

Please be careful. They gradually degrade and fail shut causing engine overheating issues. I had overtemp alarms when this part suddenly failed shut. It will not allow coolant ciruculation through the radiator is this happens. Tested with a boiling water test and indeed failed (did not open thermostat). do not recommend.

Such an easy install. Took less than half an hour total. Perfect fit and value. Durible for hard use off roading.

Good

Had the check engine light for thermostat performance which is a common issue for Jeeps with the 3.6l Pentastar. This was the cure. Coincidentally, my daughter had the same problem with her 2015 Jeep a few weeks later so I sent her the link.

he Dorman 902-852 Engine Coolant Thermostat is a must-have for any 2014 JK owner. This high-quality thermostat is easy to install and will solve the P0128 code that you're getting on your OBD2 reader.I've been using the Dorman 902-852 Engine Coolant Thermostat in my 2014 JK for over a year now, and I'm so glad I made the switch. The old thermostat was giving me all sorts of problems, including the P0128 code. After installing the Dorman 902-852 Engine Coolant Thermostat, all of my problems went away.The Dorman 902-852 Engine Coolant Thermostat is made with high-quality materials and is built to last. It's also very easy to install. I was able to do it myself in just a few minutes.If you're a 2014 JK owner, I highly recommend the Dorman 902-852 Engine Coolant Thermostat. It's a great product that will solve your P0128 code and keep your Jeep running smoothly.Here are some of the pros and cons of the Dorman 902-852 Engine Coolant Thermostat:Pros:Easy to installSolves P0128 codeMade with high-quality materialsBuilt to lastAffordableCons:None that I can think of!Overall, I highly recommend the Dorman 902-852 Engine Coolant Thermostat. It's a great product that will solve your P0128 code and keep your Jeep running smoothly.