Changing the thermostat on your 2017 Jeep Wrangler is a practical task that can help your vehicle run smoother and avoid overheating. Whether you’re fixing a cooling problem or just doing preventive maintenance, this guide will walk you through every step.
With the right tools and a bit of patience, you can save money and gain confidence working on your Jeep. Many owners are surprised how simple this job can be once you know the process.
Why Replace The Thermostat?
The thermostat controls coolant flow in your engine. If it’s stuck closed, your engine can overheat. If it’s stuck open, your Jeep may run cold, use more fuel, or throw error codes. Many Jeep owners report thermostat failure after 60,000–80,000 miles. Signs include high temperature readings, heater not working, or check engine light. Replacing a faulty thermostat protects your engine and helps maintain efficiency.
Tools And Materials Needed
You’ll need:
- New thermostat (OEM or compatible aftermarket)
- Thermostat gasket
- Socket set (8mm and 10mm)
- Ratchet
- Screwdriver
- Drain pan
- Coolant (at least 1 gallon)
- Gloves
- Shop towels
For the 2017 Jeep Wrangler, most thermostats cost $25–$60. Always check your owner’s manual for part numbers.
Step-by-step Guide
1. Prepare Your Jeep
Park on a level surface and let the engine cool completely. Hot coolant can cause burns. Open the hood and locate the thermostat housing near the top of the engine. It connects to the upper radiator hose.
2. Drain Coolant
Place a drain pan under the radiator. Open the radiator cap to release pressure.
Loosen the radiator drain plug and let coolant flow into the pan. You don’t have to drain the system completely, but removing about 1 2 quarts makes the job cleaner.
3. Remove The Thermostat Housing
Disconnect the upper radiator hose from the thermostat housing. Use a screwdriver or pliers for the clamp.
Remove the two 8mm or 10mm bolts holding the housing. Gently pull the housing off some coolant will spill, so have towels ready.
4. Replace The Thermostat
Take out the old thermostat. Note its orientation.
Clean the housing surface with a towel to remove old gasket material. Install the new thermostat and gasket. Make sure it sits flat.
5. Reinstall Housing And Hose
Place the housing back over the thermostat. Tighten the bolts evenly.
Reattach the radiator hose and secure the clamp.
6. Refill Coolant
Pour fresh coolant into the radiator until full. Use a 50/50 mix of antifreeze and water for best results.
7. Bleed Air From System
Start your Jeep and let it idle. Watch the temperature gauge.
Add more coolant if needed as air bubbles escape. Squeeze the radiator hose gently to help move air out.
8. Check For Leaks
Inspect around the housing and hose for drips. If you see leaks, tighten the bolts or hose clamp more.
After a short drive, check fluid levels again.
Comparison: Oem Vs Aftermarket Thermostats
Here’s a quick look at the differences:
| Type | Price Range | Warranty | Fit Quality |
|---|---|---|---|
| OEM | $45–$60 | 12 months | Perfect |
| Aftermarket | $25–$40 | 6–12 months | Varies |
OEM thermostats guarantee fit and reliability, but aftermarket options can be cheaper and sometimes offer better temperature control.
Common Mistakes To Avoid
- Not letting the engine cool: This can cause serious burns.
- Forgetting the gasket: Always install a new gasket to prevent leaks.
- Over-tightening bolts: Can crack the housing.
- Improper coolant mix: Always use 50/50 antifreeze and water.
- Skipping air bleed: Air pockets can cause overheating.
Many beginners miss the importance of cleaning the housing surface. Even tiny bits of old gasket can cause leaks. Also, never use just water as coolant—it lacks the protection your Jeep needs.
Estimated Time And Cost
Most people finish this job in 60 90 minutes. If you’re new, plan for two hours.
Parts and coolant usually cost $40 $80 total.
Here’s a breakdown:
| Item | Estimated Cost |
|---|---|
| Thermostat & Gasket | $25–$60 |
| Coolant | $15–$25 |
| Tools (if needed) | $0–$30 |
You can find official Jeep parts and guides at Jeep Owners Official Site.
Practical Tips
- Use gloves to avoid skin contact with coolant.
- Take clear photos before removal. This helps with reassembly.
- Double-check bolt torque. Too loose means leaks, too tight risks damage.
- Dispose of old coolant responsibly—it’s toxic to animals and humans.
Frequently Asked Questions
How Do I Know My Thermostat Is Bad?
Common signs include engine overheating, heater not blowing warm air, and dashboard warning lights. If you notice temperature swings or poor heat, check the thermostat.
Can I Drive With A Bad Thermostat?
It’s not safe. A stuck thermostat can cause serious engine damage. Always replace it as soon as possible.
What Coolant Should I Use For My 2017 Jeep Wrangler?
Use a 50/50 mix of antifreeze and distilled water. Mopar or Zerex G-05 coolant is recommended for Jeep Wranglers.
Do I Need To Bleed The Cooling System?
Yes. Air pockets can cause overheating and poor performance. Always let air escape after refilling coolant.
Is It Okay To Use Aftermarket Thermostats?
Yes, but check fit and temperature rating. Some aftermarket parts vary in quality. OEM parts are safest for reliability.
Changing the thermostat on your 2017 Jeep Wrangler is a smart way to keep your engine healthy and avoid costly repairs. With the right steps, tools, and a little care, you can do the job yourself and feel confident on the road.
Always pay attention to details, check for leaks, and use quality parts. If you’re unsure, ask a mechanic or visit the official Jeep site for advice.
