Starting From Hot In AUTO Working Mode

Conditions are correct for starting from hot when the outside temperature exceeds the selected temperature by 5° C (9° F) or when the calculated value of blended air temperature is below +80° C (95° F).

Year models 1985-89
The automatic system selects ventilation position or intermediate level, depending on sunlight and high fan speed. Fan speed drops when cabin temperature approaches the selected temperature.
The compressor is not switched on if ECON has been selected. If ambient air temperature is above 27° C (81° F), recirculation is also selected. If the difference between cabin temperature and the selected temperature is greater than 5° C (9° F), ventilation position is selected

Year models 1990-94
There can be two levels of starting from hot, depending on the result of the temperature calculations carried out by the Automatic Climate Control (ACC) unit in order to establish its control criteria. For simplicity, these levels are called hot and very hot. The following special selections apply:

Hot conditions - current to the ventilation fan increases from 4.5 A during the start up period to the required speed at 1 A per second. The air distribution damper starts in normal position, and when the fan has achieved its operating speed, the program continues in normal operation.

Very hot conditions - ventilation fan motor current increases from 4.5 A during the start up period to 8 A, and then in steps of 1 A per second until the required speed is achieved. For 60 seconds, the air distribution damper is set to "ventilation" position.

After 1 minute, the ACC control module switches to normal operation.







Year model 1995-
Fan speed is determined by the difference between the outside temperature and the selected temperature.
When starting, fan current increases by 1 A/s from 0 A to a value selected by the ACC control module.

If the actual temperature exceeds the ACC control module's calculated required temperature by more than 5° C (9° F) and selected temperature is so high that fan current calculated by the ACC control module exceeds 8 A, fan current will start at 8 A.

It will then change by 1 A/s until the calculated fan current is reached.

Under the above conditions, the air distributor will be in panel position and will, in stages, go towards normal AUTO mode.