Dorman 902-3035HP Patented Thermostat Housing Assembly With Thermostat Compatible with Select Chrysler/Dodge Models (OE FIX)

This critter really shocked me. It took less that 10 minutes to install on a modern vehicle. I didn't think that happened anymore. Just be absolutely sure you use a torque wrench when you tighten it down. But then you should be doing that anyway.

Exactly as described and was of great quality,value.Gasket was better than original. Better quality then OEM part.

Fit perfect got rid of the plastic factory one that was leaking. No problems excellent part

Better than the plastic ones, no issues and no leaks

Thermostat Housing assembly received in late September 2023, but was not installed until May 2024. Assembly was as received shown in photo 1 (screenshot from the Amazon listing). The assembly was installed in May and vehicle was fine with no problems until the winter about 6 months later. Then the vehicle would set an Engine Trouble Light and my code reader would show Code P0128 "Thermostat Rationality" - which basically means the thermostat is not allowing the engine to reach the expected temperature as quickly or completely as expected given the length of time and conditions during which the vehicle had been run or driven. I erased the code with Blue Driver and the instant code went away turning the MIL lamp off, only to have the trouble code re-appear several days later. This went on for about a month or so, then we did not see the code again until February of this year, when it began to occur about every three days or so.I ordered the Genuine MOPAR Thermostat Housing Assembly, as that is the only way to get a genuine MOPAR thermostat. It was little hard to find as many dealers messaged that it was on 'backorder' but I finally found a dealer source and got the part ordered.I drained the coolant and removed the Dorman aluminum housing and disassembled it completely to get a good close look at the actual thermostat components to try to understand why it had failed. So to be clear, the problem is not with the aluminum housing, it was the "thermostat components" in the housing that were causing the problem. See the second photo - it shows the disassembled components from bottom to top in an exploded view. To remove the thermostat components from the housing, compress the spring and rotate the stainless steel retainer out the slots and all the parts can be laid out as shown.If you look inside the coolant passage of the housing, you can see a rubber seal laying across the raised portion that the thermostat "pill" plunger pin bears on to allow the thermostat to open against the force of the spring. That seal is supposed to be fixed into the groove around the perimeter of the stainless steel thermostat disk. You can see that the groove on the disk is empty. So the seal worked its way out of the retaining groove and ended up caught in the coolant passage. This happened over time and likely finally completely dislodged in February. What this means is that the thermostat was unable to completely seal the coolant into the engine block for warmup as it would leak around the edge of the disk. See the last photo for more detail.I did not take more detailed photos, but the visible wear and tearing on the seal ring shows that it was at least partially loose and was partially caught in between the disk and the housing, rubbing causing visible tearing on the surface of the seal.Looking at the thermostat disk itself, I can see that the perimeter groove is not uniform in width and it appears that the crimp made around the rim was not uniform or was possibly not centered on the disk, resulting in variation in width of the groove and inability to correctly retain the seal ring.These are quality control issues or manufacturing defects.My advice is to get the DORMAN housing as it is a quality part, but remove your old MOPAR thermostat from the OEM plastic housing, remove the Dorman supplied parts from the aluminum housing, and re-assemble the MOPAR thermostat parts into the aluminum housing.I did this with a new MOPAR thermostat, re-installed on car, and its working as expected with no issues.

The aluminum housing itself is a great upgrade over the stock plastic! But too many people are reporting problems with the thermostat. Maybe they just had bad luck, but I wouldn't chance it. I suggest using an OEM thermostat. Or actually, I personally recommend the Ripp Mods low temperature thermostat which keeps the engine temperature lower. But if you prefer the OEM, that's fine too. But toss the Dorman.I wish that the product didn’t even come with a thermostat and cost less.

Great replacement upgrade. Thought it was the gas cap/cover but after much research in was the thermostat. Fixed the check engine code.

This is a good thermostat for my car.