With Heater - Without A/C

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 the engine to idle. Set the heater controls to "HTR" mode, full "RED" temperature, and "HIGH" 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 temperature of the outside air and the temperature of the air discharged at the floor outlets with the vehicle moving at 48 km/h (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, allow an additional 1.8 degrees of heater output temperature when the outside temperature is below 50 degrees. Allow an additional 1.6 degrees of heater output temperature for every 5 degrees of outside temperature when the outside temperature is above 50 degrees.