Output Temperature Check (Heater)

Check the heat output of the heater system with the following procedure.

Preparation
With the engine sufficiently cool, remove the radiator cap, start the engine, and allow it to idle. Set the heater controls to HTR mode, full Red (Hot) temperature, and HI blower speed. When coolant flow in the radiator is visible through the filler neck, install the radiator cap.

Temperature Check




When the engine is warmed up (after approximately 20 minutes of operation), drive the vehicle. Use an accurate thermometer to determine the outside air temperature and the temperature of the air discharged at the floor outlets with the vehicle being driven at 48 kph (30 mph). Minimum acceptable heater output temperatures at four different outside air temperatures are shown in the table.

Minimum acceptable heater output temperatures for outside air temperatures other than those shown can be approximated by using the Fahrenheit scale and rounding off the outside air temperature to the nearest 5 degrees. For every additional 5 degrees of outside temperature, an additional 1.8 degrees of heater output

temperature should be allowed when the outside temperature is below 50 degrees. An additional 1.6 degrees of heater output temperature should be allowed for every 5 degrees of outside temperature when the outside temperature is above 50 degrees.