Subaru Impreza 2002 Service Manual page 3209

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
7) If the thread does not move at all, remove the
auto A/C control unit <Ref. to AC-31, REMOVAL,
Control Unit.> and check for improper connection
of the aspirator hose (a) and auto A/C control unit
and secure as necessary.
GENERAL DESCRIPTION
3. REFRIGERANT LINE
Check contact for refrigerant line (A).
(a)
4. CONTROL LINKAGE
HV0028
1) Check the state of mode door linkage.
2) Check the state of air mix door linkage.
3) Check the state of intake door linkage.
AC-4
(A)
HV0029