Quote:
Originally Posted by 444-4D
Why do you think this?
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Because with a 203º thermostat, when the coolant temperature is above 203º, the thermostat is fully open.
If you have a 195º thermostat, it fully opens at 195º. This will include all temperatures above 203º too.
So at 203º, both thermostats will be fully open, allowing full flow coolant to run through the system.
When temperature is below 203º with a 203 thermostat or 195º with a 195 thermostat, both thermostats are operating identically. The is because they are both closed.
The above is how normal and conventional cooling systems work.
So the talked about differences will be if your coolant temperature is below 203º.
The benefits will be when your engine is between 195º and 203º. This benefit is the amount of time it takes for your engine to warm up between 195º and 203º. Or anytime your engine is below 203º.
It's also the reason why most emissions are emitted during startup.
I'm not sure of the idle temperatures between the Ford or large commercial truck. Not sure if Ford tried solving the startup emissions, idle emissions, or both.
And when doing an emissions test, you can run up your RPM's above idle, which may generate enough heat above 195º.
So again, I'm not sure what emissions Ford was trying to solve.
Jake
