I have a question as to whether the water pump and thermostat are in good condition since the coolant temperature remains between 200 and 220 ° F. and the oil pressure at 500 RPM is 30 PSI, at 2000 RPM it is 40 PSI, at 3000 RPM it is 45 PSI ... what do you think?

 

Welcome to FTE!

ECT of 220 is arguably a bit on the high side.

Oil pressures look reasonable to me.

Qualifier is whether these readings are per the dash gauges or from separate gauges. If from the dash gauges, these readings are known more as indicators of what is going on versus actual values.

In any event, if the oil pressure gets too low, the computer will shut-off the motor. So as long as the truck starts and seems to run normally, oil pressure is good no matter what the dash gauge shows.

Toward the original question of whether the water pump and thermostats are healthy, it is not as simple as a snapshot reading as there are other factors in play. Another element in the equation and not asked about is the fan clutch. If the clutch is not locking-in, it can make temps appear normal when driving empty, and lead to overheats when loaded.

Pulling this full circle, if the ECT behaves normally, it will:
- Have a reasonable rate of temperature increase from cold start.
- Be able to maintain temperature no matter what the load.

Another component not asked about is how to check the coolant's integrity. Recommend doing some homework here. Also, learn whether SCA testing is appropriate for the coolant in the motor.