Best Car Engine Thermostats of 2026

"I found installation to be really straightforward, and it holds the engine temperature right where it should be. It seems to be working great so far!"

"I just put this in as an upgrade from the factory thermostat and it's been working perfectly. I can tell it's a higher performance unit, which is exactly what I was looking for."

"The fit was spot-on for my 2001 Jeep Wrangler 4.0L, and after swapping out the old thermostat, my Jeep runs a good 7-10°C cooler. I'm very satisfied with the result and hoping it lasts a long time."

"I found this thermostat to be a perfect fit for my 2003 Honda Civic. Installation was simple, and the price was a fraction of what I expected. It also seems well made, which gives me confidence in its longevity."

"After my daughter's friend got a thermostat temp code, I decided to give this product a try. Since installing it, the code has stayed clear, and the car runs great. The job was a bit fiddly, but being able to filter and reuse the coolant helped save even more money."

"I installed this on my 2007 Civic Hybrid and it did the job, but I have to say, accessing the bolts was a real hassle. I had to remove several other parts just to get to it. Still, once in, it worked perfectly."

"I found that the part was too small compared to my factory OEM parts for my 2000 Toyota Camry, and it ended up being a misleading fit."

"After some investigation, I realized my initial 1-star review was misplaced. The thermostat actually did its job by failing open when my radiator fan started acting up, which prevented overheating. The fail-safe feature really works—just make sure you diagnose the whole cooling system, not just the thermostat."

"In Arizona's extreme heat, I wanted extra protection for my engine. This thermostat is inexpensive insurance against engine damage—if it fails, it stays open so coolant keeps flowing. It's a smart investment if you want to avoid being stranded with serious engine trouble."

"Installed this in my '05 TJ, and when the engine got a bit too hot, the fail-safe kicked in and the thermostat stayed open as designed. Once it fails open, you have to replace it, but it's much better than risking an overheating engine."

"When I installed this thermostat, my engine temperature returned to normal and the persistent cooling fan issue disappeared. The product included a gasket and fit perfectly. I strongly recommend sticking with OE quality like ACDelco rather than risking aftermarket brands."

"I replaced the factory thermostat on my Silverado with this one and did the temp sensor at the same time—quick job and now the coolant temp is right where it should be. Very straightforward replacement."

"The fit was exactly as described, worked flawlessly, and was much cheaper than local parts stores. If I need another, I'd buy this again without hesitation."

"I installed this in my 6.8L V10 Excursion and it fit perfectly. The rubber seal was a bit snug, but once in, it worked great. Used it during a coolant flush for preventative maintenance—definitely happy with my choice. Solid purchase!"

"In my 2006 Ford F150 4.6 V8, this thermostat has been running strong for over a month. Swapped out the 190 for the 180, and it keeps the engine running cool, which is ideal for Wyoming's wild temperature swings. Only minor gripe: it's a bit large with the included O-ring, but nothing major. No problems so far."

"Bought this for my 2005 F150 4.6L. The gasket design didn't quite match what I needed, so I had to pick up a new one locally. Once replaced, it did the job as expected."

"I installed this thermostat on my Ram 1500 and found the process extremely straightforward. The included seal ensured a tight, leak-free fit, and it’s been keeping my engine at the right temperature ever since. In terms of quality and reliability, it matches or even surpasses the OEM part. I think it’s a great value for anyone needing a dependable replacement."

"After putting the MotoRad thermostat in my 2012 300C 5.7L Hemi, I noticed it lowered my engine’s operating temperature as promised. However, the car’s computer expects a higher minimum temperature and threw a check engine code, which affected ECO mode and gas mileage. The product itself works well, but be aware of potential compatibility issues with engine computers if you don’t update your tuning."

"I’ve gone through two of these thermostats in the past year, so I feel the longevity isn’t quite what’s advertised. Both ended up sticking and causing overheating, which unfortunately led to engine damage. I recommend watching your temperature gauge closely if you decide to use this part."

"I replaced the thermostat and housing on my 2004 Chevy Avalanche Z71 two years ago, and they've been a perfect fit and still work flawlessly. I’m very satisfied with how well they’ve held up."

"When I installed this on my 2001 GMC Yukon 5.3L during a water pump replacement, I was impressed it came with a thermostat and upgraded gasket—the design is a real improvement over the original. Everything fit perfectly, and I loved the convenience of getting all the parts together for a great price."

"This part was a direct fit for my 2004 Chevy Tahoe and included all the essentials to make the installation quick and painless. The OEM quality at a fraction of the cost compared to local stores is a huge plus."

"I've trusted this brand for years and it didn't let me down—fit my 2008 Avalanche perfectly and keeps my engine running at the ideal temperature. After a complete coolant system refresh with Gates parts, my truck performs flawlessly month after month."

"Quick and hassle-free installation—it came with a seal and fit just right. Since swapping it in, no leaks and my engine no longer overheats when idling. For the price, it’s a great deal. I’ll post an update if anything changes."

"After trying parts store thermostats that only fixed my overheating temporarily, this one solved my Escalade's temperature problems immediately. Even though I ordered an OEM as backup, I'm sticking with this since it’s working perfectly. Highly recommend if you want a real fix."

"I thought this would fit my Pontiac Bonneville, but it definitely did not. The product description needs updating to prevent more returns."

"It was a perfect fit for my car and installed easily, but unfortunately, it only worked for about 40 miles before stopping. Sometimes these things happen."