Functional Check - Aston Martin DB7 Workshop Manual

Air Conditioning
Functional Check
Functional Check
This functional check procedure is provided as a simple system validation and is structured to augment the Portable
Diagnostic Unit (PDU).
Stage 1 (Cold engine only, if not proceed to Stage 2)
Procedure Normal System Reaction
1. Ignition O N
Select MIN temperature, M A N , speed 3, Mid face.
(Engine Stationary) Fans Start
2. Select MAX temperature Fans continue to run
3. Ignition OFF
Select MAX temperature and defrost
Ignition O N Fans start at maximum speed
4. Select fan speed 1 Fan speed adjusts accordingly - system OK
Stage 2
Procedure Normal System Reaction
1. Start up engine and warm up
Select fan speed 1, M A N , MAX TEMPERATURE
and mid face
2. Open all vents Fans start after 3 seconds
2. Select fan speed 2 Fan speed increases then stabilises
3. Select fan speed 3 Fan speed increases then stabilises
4. Select defrost Fan speed steady at high
All air at screen and dash end
5. Re-select fan speed 1
Select AUX ignition key position
6. Slowly select MIN temperature Solenoids switch 1. centre vent
2. water valve
3. Re-circulation
7. Re-select MID temperature
8. Select DEM Solenoid clicks
Air at screen
9. Select manual re-circulation Solenoid click
10. Check flap for position
11. Run Engine to normal temperature
12. Select: M A N , 3/4 MAX heat and fan speed 2 Air from door vents cool,
air temp from foot outlet slightly warm
13. Select MAX temperature and air differential to hot face All vent outlets max temp except screen vent
14. Select temperature
approx. 1/4 MAX heat and mid face level Cool air from centre vents
15. Select MIN temperature Blower flaps at re-circulation position
All outlets blowing cold air except screen vent
May 1996 8-15