Chrysler Town, Dodge Caravan. Manual - part 835
TEST
ACTION
APPLICABILITY
5
CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test the A/C
system operation.
NOTE: Active codes must be resolved before diagnosing stored codes.
NOTE: Anytime a DTC becomes active, or a Cooldown Test fault message,
Actuator Circuit Test fault message, or HVAC Door Recalibration fault
message is displayed, proceed to the conclusion question.
NOTE: If multiple codes appear, diagnose those that relate to a short circuit
first.
Start the engine.
Press the A/C - Heater Control power switch on.
Turn the mode select control to the panel position.
Verify that the front blower motor and, if equipped, rear blower motor operates
correctly in all speeds from each control. Diagnose and repair all blower related faults
before proceeding with this test.
Turn the front blower motor control to the high speed position.
NOTE: Before actuating the AC Cooldown Test, verify that the A/C compres-
sor is not running. If the compressor is running, turn the A/C off and allow
the evaporator to warm up before proceeding with the test.
With the DRBIII
t in HVAC, System Tests, actuate the AC Cooldown Test.
Turn the front blower motor control to the low speed position.
If equipped, turn the rear blower motor control to the rear position.
Set the passenger blend control to the full cold position.
If equipped, set the zone/driver blend control to the full cold position.
If equipped, on the Rear Blower Rear Control, set the rear blend/mode control to the
full cold position.
Monitor the DRBIII
t for active HVAC DTCs while performing the following test
steps.
Turn the mode select control to the defrost position, wait 30 seconds, and then turn
it back to the panel position.
Press the recirculation mode switch on, wait 30 seconds, and then press it off.
Press the A/C mode switch on, wait 30 seconds, and then press it off.
Press the rear window defogger switch on, wait 30 seconds, and then press it off.
Move the passenger blend control from full cold to full hot, wait 30 seconds, and then
move it back to full cold.
If equipped, move the zone/driver blend control from full cold to full hot, wait 30
seconds, and then move it back to full cold.
If equipped, on the Rear Blower Rear Control, move the rear blend/mode control from
full cold to full hot, wait 30 seconds, and then move it back to full cold.
With the DRBIII
t in HVAC, System Tests, actuate the Actuator Circuit Test.
With the DRBIII
t in HVAC, System Tests, actuate the HVAC Door Recalibration
Test.
Does the DRBIII
t display any active HVAC DTC(s) or System Tests fault message(s)?
All
Yes
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
With the DRBIII
t, read PCM/ECM DTCs.
Are any HVAC related DTCs present?
All
Yes
→ Refer to the Powertrain Diagnostic Procedures Manual for the
related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Recheck the climate control system performance. Refer to Service
Information for additional information.
Perform BODY VERIFICATION TEST - VER 1.
576
HEATING & A/C
*HVAC SYSTEM TEST - MTC —
Continued