Need a scan tool to get to the codes
While engine is warming, VCM monitors ECT sensor to determine the amount of time it takes engine to reach coolant temperature required for closed loop operation. DTC P0125 will set if VCM determines that ECT does not reach minimum coolant temperature required for closed loop operation in a specified amount of time.
Scan tool displays engine temperature in degrees centigrade. After engine is started, temperature should steadily rise, and then stabilize when thermostat opens
if not thermostat should be changed
reading INFO about heater oper:
The temperature of the air coming from the heater duct and the defroster nozzle is regulated by controlling the relative amounts of warm and cool air coming from the heater module. The temperature valve determines the amount of the total airflow that passes through the heater core.
When the temperature **** in the control assembly is at the extreme left side of travel, the full BLUE, or cold position, the temperature valve stops all the airflow through the heater core. The heater duct and the defroster nozzle receive only unheated air.
When the temperature **** moves away from the full BLUE, or cold position, the temperature valve opens to allow an increasing amount of air to pass through the heater core. At the same time, the temperature valve reduces the amount of unheated air that enters into the mixture. The result is a very responsive control of the temperature of the air discharged through the heater ducts and the defroster nozzle.
When the temperature **** reaches the full RED, or hot position, to the extreme right end of travel, the temperature valve diverts all the airflow through the heater core for maximum heating.
Hot coolant from the engine moves through the heater core and returns to the cooling system when the engine is running.
The heater system provides heating, ram air, power ventilation, and the windshield defrosting. The blower fan draws outside air from the plenum at the base of the windshield into the heater module. The forward movement of the vehicle forces additional outside air, or ram air, into the heater module. Within the heater module, the air is heated. The heated air is routed through the ducts to the proper outlets for discharge into the passenger compartment. A control assembly in the instrument panel allows the operator to control the blower speed, the mode of operation, and the temperature of the air coming from the heater system.
The heater module contains components that heat the air, and direct the air to the proper ducts and outlets.
Monday, December 13th, 2010 AT 1:23 AM