Should I remove the thermostat from my car?
Car thermostat
What you need to know:
- You should only remove the thermostat if you are replacing it with a new one. If your current thermostat is not failing, evidenced by overheating, erratic temperature changes, or coolant leaks, you should keep it.
Hello Paul, I am a frequent reader of your articles, and they have helped me a lot. I have just bought a used Toyota ST190 from Japan with more than 100,000km mileage. The mechanics are advising me to remove the thermostat before taking my first trip to Kabale. However, I recall that you always recommend keeping the thermostat. I have ordered a new one from Toyota, but it will take two months to arrive. Can I remove the old thermostat and drive without it, even though the car is running fine? Wilber
Hello Wilber, the engine thermostat is a temperature-activated switch that regulates coolant flow to maintain optimal engine temperature. Removing it entirely can lead to overcooling, which forces the engine management system to run at higher revs, increasing fuel consumption and gradually damaging the cylinder head.
You should only remove the thermostat if you are replacing it with a new one. If your current thermostat is not failing, evidenced by overheating, erratic temperature changes, or coolant leaks, you should keep it.
Instead, have a mechanic service the coolant system with three litres of concentrated coolant mixed with three litres of water, or six litres of pre-mixed coolant.
This will lubricate and protect the cooling system until your new thermostat arrives.
Given your vehicle’s mileage, you should also consider replacing the fuel filter, timing belt, and spark plugs.
