What happens if the thermostat is removed?

[GiannaDella]

Removing the thermostat will cause the engine to consume more fuel. This is because, after the thermostat is removed, the engine coolant will always circulate in a large loop, and the engine's water temperature will remain at a low level. Especially during cold starts, it will take a long time for the engine to reach its normal operating temperature. The engine's computer calculates the fuel injection volume based on factors such as water temperature, intake air temperature, and air flow rate. Normally, a cold engine requires more fuel injection than a warm engine. If the engine remains at a low temperature for an extended period, the engine computer will continuously detect a cold engine state, resulting in the fuel injection volume corresponding to a cold engine. Therefore, the thermostat should not be removed.

[MacAlice]

After removing the thermostat, the engine may experience prolonged insufficient cooling or overheating, affecting normal operation. In hot weather, the engine is prone to overheating and smoking, with even the risk of burning out the cylinder head; on cold days, the car's heating won't work, making it uncomfortably cold. Fuel efficiency will also drop because the engine isn't running at its optimal temperature, potentially increasing fuel consumption by 10%, leading to higher fuel costs over time. Another issue is improper coolant circulation, which can damage the water pump and radiator, resulting in future repair costs of several thousand dollars. I've seen many cars break down on the road because of this, with expensive towing fees. It's recommended not to remove it, keeping it as is or replacing the part promptly, ensuring both safety and cost savings.

[DeLandon]

I once removed the thermostat myself, thinking I'd save on repair costs. But on a scorching day, the engine suddenly started smoking and nearly caught fire. Later, I had to take it to the shop to fix the radiator and several parts, costing me thousands—it was heartbreaking. Fuel consumption also increased; previously, a full tank could go 500 km, but now it's less than 450, costing me an extra hundred or two in gas each month. Winter is even worse—the car feels like a freezer with no heat at all. It's genuinely dangerous, especially on long trips or in traffic jams, as uncontrolled engine temperatures can lead to breakdowns, causing major delays. Had I known these consequences, I would never have tampered with it. It's better to stick with the original factory design.

[Herb]

When my car had problems before, someone suggested removing the thermostat to save money, so I tried it. But trouble came quickly: the engine kept fluctuating between hot and cold, the car felt like an ice cave in winter, and the AC performed poorly in summer; fuel consumption noticeably increased, requiring extra gas station trips each week. Soon after, the engine light came on, and the diagnosis was a damaged cooling system, costing 1,200 yuan to fix. From that experience, I learned that such minor modifications may seem convenient but actually hide many risks, like shortening component lifespans. Now, I always advise others not to recklessly remove car parts to avoid spending more money and time later.

[JuneLynn]

Removing the thermostat can cause unstable engine temperatures, leading to incomplete fuel combustion and increased exhaust emissions, which pollute the environment. I believe this not only wastes petroleum resources but also exacerbates air pollution and affects air quality. From a personal experience perspective, the car interior feels freezing in winter, while the engine may overheat and damage the vehicle in summer. Economically, it's also a loss, with fuel consumption increasing by over 15%, costing hundreds more on fuel annually. In the long run, this accelerates part wear and tear, making repair costs higher than keeping the thermostat. Therefore, from both ecological and vehicle protection standpoints, maintaining the original design is wiser—less hassle.

[DaisyLynn]

Removing the thermostat may seem harmless in the short term, but problems emerge quickly. The engine either runs too cold or overheats too fast, especially during highway driving—disrupted coolant flow can easily cause water pump failure. I've seen this trigger the check engine light or steam emission, with repair costs starting at 800. Daily driving becomes inconvenient: heating fails in winter, AC struggles in summer; fuel consumption also increases by 0.5L per 100km. Long-term, accelerated engine wear and overall vehicle deterioration occur. Regular inspection and replacement are advised—don’t invite big trouble by saving small money.