Aqua Hot digital reading.. - We suggest you first turn off the system and allow it to cool. Then top off the fluid resouvoir (under the radiator cap), and the plastic coolant recovery tank to the marks stamped on the tank. Use a 50/50 mix of anti-freeze and water. Don't overfill the recovery tank or it will overflow when hot. But you should see fluid in the plastic tank, hot or cold. If the temperature reading is still irratic after topping off the fluid, change the sender. The sender is behind the access panel for the thermostats above the diesel burner.
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Hopefully this helps.
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