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Final Assembly, Engine Start, and Bleeding

18:20
23:42
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At 18:20 in

Fixing P0128 on My 2017 Jeep Wrangler — EASY Thermostat Replacement!

What happens here

Reinstall the air intake system and the engine cover in reverse order of removal. Start the Jeep's engine and let it run, allowing it to reach operating temperature. Monitor the coolant temperature displayed on the dashboard. Once the temperature reaches approximately 204°F (95°C), the new thermostat should open, causing the coolant temperature to drop. This confirms the thermostat is functioning correctly. Allow the engine to cycle through this process a few times. You may need to open the bleeder screw again briefly after the thermostat opens to release any remaining air trapped in the system. After the engine is off and cooled, check the coolant level in the reservoir and top off if necessary.

Goal: Complete assembly, verify thermostat function, and ensure the cooling system is properly bled.

Tools and materials

  • 10mm Socket Wrench Icon — Tightening air intake bolts
  • Flathead Screwdriver — Tightening hose clamps
  • Quarter-inch wrench — Opening and closing the bleeder screw

What they say

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run it, I'll bleed it for you guys. So, I got it running. I connected connected the intake sensor so I don't feel a code. But I'm going to pop this bleeder. that. Look at us. See it there. So before I get everywhere, I'm going to go ahead and close that up. I'm going to pull I'm just going to pour a little bit more in here. See if this takes it. Taking it. So now I'm going to go since I have this cap open shrinking it. I'm going to go here. Bleed that. Okay, I'm going to tighten this up while the Jeep's running and we'll throw this back on. All right, so I'm going to leave this running. Get up to temp balancing that down there. That down there. Don't forget to put your hose in there. That should grab the screw for this. Don't forget two 10 mm. These would be easier with like a socket on them, but you can do it with a flathead. tighten that one. So, I'm going to let the Jeep get up to temp now and then we'll uh we'll see how the heat feels and we'll see how it's running. I did just do an oil change as well. So, I'm going to check my oil, make sure that I got enough oil in there. Um we'll go from there. So, it's reading 203 and at 204 it hit its mark and it's going to start going down now. 2011 199. See? So, once it hit 204, that thermostat opened and allowed the coolant to go through. And now it's going to regulate that temperature between 203 195 to 210 is the is the sweet spot depending on a lot of things. The garage is heated. Um we're not driving. We're not under load. So at 204 it opened up. It's going to drop us down to about 193ish. It's going to build it back up. So

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