Heater Output Temperature Check

The heat output of the heater system can he checked with the following procedure.

PREPARATION

With the engine sufficiently cool, the radiator cap should be removed and tile engine started and allowed to idle (3800 V6 only). Heater controls should he set to heater mode, temperature control knob turned all the way to full hot and "HIGH" blower speed. When coolant flow in the radiator is visible through the filler neck, the radiator cap should he installed (3800 V6 only).

Important
Do not remove radiator cap on 5.7L V8 engine while running.

TEMPERATURE CHECK

When the engine is warmed up (after approximately 20 minutes of operation), the vehicle should he driven. An accurate thermometer should he used to determine the temperature of the outside air and the temperature of the air discharged at the floor outlets with the vehicle being driven at 48 km/h (30 mph). Minimum acceptable heater output temperatures at four different outside air temperatures are shown in Figure.

Minimum acceptable heater output temperatures for outside air temperatures other than those shown in Figure can he approximated by using the Fahrenheit scale and rounding off the outside air temperature to the nearest 5°. For every additional 5° of outside temperature, an additional 1.8° of heater output temperature should be allowed when the outside temperature is below 50°F An additional 1.6° of heater output temperature should he allowed for every 5° of outside temperature when the outside temperature is above 50°F.