If I install a lower temperature thermostat will my engine run cooler and not overheat? Yes, but it can cause more problems than the one you're trying to fix if you have a newer vehicle. Before engine control systems came along it was common to install a cooler thermostat in the summer and a hotter one in the winter. It is no longer recommended to do this because today's computerized engine control systems need a constant year-round operating temperature.(189-197 degrees F. ) The engine computer controls emission, fuel and spark systems and it requires a set temperature to do this.
The coolants temperature sensor sends information to the computer and this tells the computer how to set ignition timing, fuel injector timing and pulse width, when to open the EGR valve, purge the charcoal canister and many other things. Running the engine to cool will cause poor fuel economy and drive ability problems.Under any circumstances it is not recommended to operate a vehicle without a thermostat. This can cause thermal stress making the engine severely overheat and can crack an engine block or cylinder head. Have any questions: Contact Us