Have you ever encountered a code P0128 in the computer of your 2015 Jeep Grand Cherokee? Well, in this video, we will guide you through the process of addressing this issue. The code indicates a thermostat improbable value, which commonly points to a stuck open thermostat. Even if the vehicle is not overheating, the thermostat might be stuck in the open position, and we are about to fix it.
The first step is to have the owner remove the plastic cosmetic cover to avoid any damages. After removing the cover and some parts, we locate the thermostat and proceed to replace it with a new one. Once the thermostat housing is removed, we clean off the old seal and install the new thermostat, securing everything back tightly. We refill the coolant and start the vehicle, monitoring the radiator to ensure proper circulation and no leaks.
After confirming the successful repair, we also check the air filter and provide a quick tip for cleaning it without buying a new one. Additionally, we address a broken hose, identify it as part of the evaporative emission system, and discuss the potential need for its replacement in the future.
If you encounter similar issues with your vehicle, this video provides a detailed walkthrough of the process. Stay tuned for more repair videos, and feel free to subscribe for future updates!
What was the issue with the 2015 Jeep Grand Cherokee?
The vehicle had a code P0128 in the computer, indicating a thermostat value improbable. It was diagnosed as a stuck open thermostat.
What were the steps to repair the thermostat?
The steps to repair the thermostat included removing the plastic cosmetic cover, taking out the long funky tube and the air box, removing hose clamps, undoing sensor harness, using a 10mm socket and plier to take off a hose clamp, and replacing the thermostat with a new one.
Was there any specific tool or equipment required for the repair?
Specific tools used for the repair included a 10mm socket, pliers, hose clamp, screwdriver, torque wrench, and a Christmas tree fastener puller. Additionally, a new thermostat assembly was recommended to purchase.
How was the coolant bleeding process managed?
The process of bleeding the coolant was done by pouring coolant into the radiator, loosening the radiator cap, and observing the coolant circulation. Any remaining bubbles in the system were expected to come out over the course of normal driving.
Were there any additional issues discovered during the repair?
A broken purge hose for the evaporative emission system was discovered during the repair. The broken hose was temporarily fixed with tape, and the decision to replace it was postponed to await any potential check engine light issues.