
Originally Posted by
ozscott
Hi,
When my HVAC is set manually to face a lot of air is still coming out of the floor vents and only when I set the controls to windscreen that the air coming out of the floor vents stops...I don't recall it doing that when it was new. Can you guys let me know what happens with yours ?
Check out carefully the factory set operation mode and compare cos what you say might be normal operation, it has a very strange behaviour by default:

Originally Posted by
RAVE - AIR CONDITIONING - 82-20 DESCRIPTION AND OPERATION
Air distribution control
To control the air distribution within the cabin the ATC ECU signals the servo motor controlling the distribution flaps
in the heater assembly to move to the flaps to the appropriate position.
In the automatic and economy modes, if the LH or RH temperature selections are set to LO or HI, air distribution is
fixed as follows:
- If one is set to LO and one is set to a specific temperature, to face level only.
- If one is set to HI and one is set to a specific temperature, to footwells only.
- If one is set to LO and one is set to HI, to face level and footwells.
When specific LH and RH temperature selections are set, air distribution is determined from the target air outlet
temperatures. For higher target air outlet temperatures, air distribution is set to footwells only. For lower target air
outlet temperatures, air distribution is set to face level only. For intermediate target air outlet temperatures, air
distribution is set to face level and footwells. When the air distribution is set to face level and footwells, the ATC ECU
varies the bias between the footwells and the face level outlets, in three stages, to provide a gradual transition of air
distribution from footwells only to face level only. The three stages of bias are also employed when the air distribution
is manually selected to face level and footwells.
During warm-up, the air distribution changes to face level and footwells for a period, then reverts to footwells only.
The period of air distribution at face level and footwells can be cancelled by pressing and holding the on/off and defrost
mode switches, then turning the ignition switch from off to on. Pressing and holding the AUTO and defrost switches,
then turning the ignition switch from off to on, restores the period of air distribution at face level and footwells.
Discovery Td5 (2000), manual, tuned
Bookmarks