Jeep Wrangler Thermostat Replacement 3.6L Removal

The thermostat is a temperature-controlled gatekeeper that allows the flow of coolant through the engine and radiator. On a cold start, it remains closed to help the engine reach operating temperature. When it heats up, it opens and allows coolant to flow. Thermostats fail by becoming stuck open or closed — the latter leads to more dire consequences. If you’d rather have a professional handle it, our mobile mechanic services come to you anywhere in the Davie area. If you’ve managed to diagnose the thermostat failure as one or the other, get some tools and parts together: You’ll need a drain pan, tools, new coolant, a new thermostat, a new thermostat gasket and a little silicone sealer.

Warning: Do not loosen the radiator draincock with the system hot and pressurized. Serious burns from coolant can occur.

Caution: The thermostat and housing is serviced as an assembly. Do not remove the thermostat from the housing, damage to the thermostat may occur.

Disconnect and isolate the negative battery cable. 2013-2021 Jeep Wrangler Thermostat Replacement
Remove the engine cover.
Remove the air cleaner body.
Drain the cooling system.
Remove the upper radiator hose from the thermostat housing (1).
Remove bolts and thermostat housing (1) with thermostat (3).
Remove and discard the thermostat housing gasket.

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Installation 2013-2021 Jeep Wrangler Thermostat Replacement

Follow the next steps to accomplish a precise installation with minimal obstacles subsequent to thermostat removal:

Clean mating areas of timing chain cover and thermostat housing (1).
Install a new gasket on the thermostat housing.
Install the thermostat housing (1). Tighten bolts to the proper torque specifications.
Install the upper radiator hose to the thermostat housing (1).
Fill the cooling system.
Install the air cleaner body.
Install the engine cover.
Connect the negative battery cable.
Start and check for leaks.

How To Change a Thermostat 2013-2021 Jeep Wrangler Thermostat Replacement

How To Change a

Thermostat 2013-2021 Jeep Wrangler Thermostat Replacement

First things first, don’t work on the cooling system of an engine that’s still hot. Check out the owner’s manual and the situation under the hood before you begin. When the engine is cool, locate the thermostat housing. Drain the radiator and remove the hose at that connection (this is a good time to condition your hoses). Be careful to prevent debris from falling inside.

Next, grab your tools and remove the thermostat housing. Depending on your vehicle, there might be other components you have to remove to get to it. Once the housing is removed, the thermostat should be exposed. Note that you might have to pry it out with a flathead screwdriver.

SWITCH IT OVER 2013-2021 Jeep Wrangler Thermostat Replacement

Feel free to test your thermostat at this point, but honestly if you’ve come this far, you might as well change it. Scrape off any residual residue around the housing and block. Don’t get too aggressive with the scraper, as aluminum is a popular metal for housings and you can gouge the sealing surface. Double-check that the new thermostat has the proper temperature rating, and acquaint yourself with the direction of flow, because it’s very easy to install it backward and have to do this all again. Use a little silicone sealer (RTV) to hold the thermostat to the housing, install the gasket on the block and match up the two surfaces, making sure nothing slips out of place.

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PUT IT BACK 2013-2021 Jeep Wrangler Thermostat Replacement

PUT IT BACK 2013-2021 Jeep Wrangler
Thermostat Replacement

To begin with, tighten each of the housing bolts a little at a time for even pressure, making sure they all end up tight. A good torque wrench and a service manual are your friend in making sure the bolts are properly tightened. Too loose and it might leak, too tight and you can actually crack the thermostat housing. Reconnect the hose and any other components you had to remove. Add coolant, making sure you’ve tightened the radiator drain plug, then install the radiator cap. At this point, you should be good to fire up the vehicle and check for any leaks. Let it run for a while under observation. Continue checking for leaks, watch the gauges on the dash and look out for any warning lights. If the thermostat opens at operating temperature after a few minutes (or a bit longer in the winter), then your job is done! Of course, if you’re not comfortable doing this yourself, take your vehicle to the experts at Autotech Mobile Mechanic. Problems with the engine cooling system are not something to play around with. We specialize in auto AC and brake repair services, giving you the best option in quality and prices and years of expertise in the industry. If you would rather skip the DIY route, our mobile mechanic services come to you anywhere in the Davie area. Call (954) 826-5523 and we will have your Wrangler back on the road in no time.

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