Its not a job that I would say remove that part and try it
its a lot of work and money to say oo oo ! It didn't work lets try something else
u need to run a diagnose test on it
AUTOMATIC A/C-HEATER SYSTEMS -2001 Dodge Caravan SE
NOTE: Following procedures were written specifically for use with a DRBIII Â scan tool. Other generic scan tools can be used, but may have limited functions.
SELF-DIAGNOSTIC SYSTEM
READING DIAGNOSTIC TROUBLE CODES
Automatic Temperature Control (ATC) module is capable of storing active and stored Diagnostic Trouble Codes (DTC) or DTC/fault messages. An active DTC/fault message indicates that a fault currently exists. A stored DTC/fault message indicates that a problem had occurred in system, but is not currently present. Active DTC/fault messages cannot be erased until cause of fault has been repaired or no longer is present. When an active DTC/fault message is no longer detected, it is converted into a stored DTC/fault message and will remain until DTC/fault message has been erased. Stored ATC module DTC/fault messages can be erased using DRBIII Â or generic scan tool (refer to scan tool manufacturer's instructions).
Set parking brake and block wheels. Place transmission gear selector in Park, or shifter in Neutral. Start engine, and allow engine to idle. Using scan tool, check for Powertrain Control Module (PCM) DTC/fault messages present for A/C-heating related systems. If PCM DTCs P0645, P1598 or P1599 are present, record each message and go to appropriate test procedure(s). See ATC MODULE DTC/FAULT MESSAGES index under DIAGNOSTIC TESTS.
Using scan tool, select HVAC system and check all DTC/fault messages present which are currently set (active) or stored in ATC module memory. Active DTC/fault messages take priority over stored DTC/fault messages. Diagnose any active DTC/fault messages before investigating any stored DTC/fault messages. If DTC/fault messages are present (active or stored), record each message and go to appropriate test procedure(s). See ATC MODULE DTC/FAULT MESSAGES index under DIAGNOSTIC TESTS.
CLEARING STORED DTC/FAULT MESSAGES
NOTE: Active DTC/fault messages indicate a fault currently exists. Active DTC/fault messages cannot be cleared until condition for setting DTC/fault messages has been repaired or is no longer is present, and ignition cycle has been completed.
Stored DTC/fault messages can be erased using DRBIII Â or generic scan tool (refer to scan tool manufacturers instructions). Follow screen prompts on scan tool to clear all stored DTC/fault messages. Cycle ignition switch off and on. Read DTC/fault messages again. Ensure all DTC/fault messages have been cleared.
MONITOR & SET CONDITIONS
Description
Following list are possible ATC module Diagnostic Trouble Codes (DTC) and/or DTC/fault messages, or symptoms that could be displayed on scan tool. Then a description of when ATC module DTC/fault messages are monitored, and conditions necessary to set the listed DTC/fault message. For appropriate testing procedures for ATC module DTC/fault message displayed, see ATC MODULE DTC/FAULT MESSAGES index under DIAGNOSTIC TESTS.
DTC P0645
Monitored with ignition switch in ON position. Battery voltage greater than 10 volts. A/C switch on. DTC P0645 will set when an open or short condition is detected in A/C clutch relay control circuit.
DTC P1598
Monitored with engine running and A/C relay energized. DTC P1598 will set when A/C pressure signal at PCM increases to greater than 4.92 volts.
DTC P1599
Monitored with engine running and A/C relay energized. DTC P1599 will set when A/C pressure signal at Powertrain Control Module (PCM) is less than.58 volt for 2.6 seconds.
A/C Pressure Too High
Monitored with ignition switch in ON position. DTC/fault message sets when A/C pressure sensor value is greater than 250 counts.
A/C Pressure Too Low
Monitored with ignition switch in ON position. DTC/fault message sets when A/C pressure sensor value is less than 20 counts.
Ambient Air Temperature Message Missing
Monitored every 8 seconds. DTC/fault message sets when outside air temperature signal is expected, and is not received within the maximum time allowed.
Body Status Message Missing
Monitored every 8 seconds with ignition switch in ON position. DTC/fault message sets when ATC module does not receive body status message within 8 seconds.
Coolant Temperature Message Missing
Monitored every 8 seconds with ignition switch in ON position. DTC/fault message sets when ATC module does not receive coolant temperature message within 8 seconds.
Driver Blend Door Not Responding
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module does
not receive feedback pulses within 5 seconds from the time the drive voltage was applied.
Driver Blend Door Travel/Range Too Large
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is greater than expected.
Driver Blend Door Travel/Range Too Small
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is less than expected.
Engine Sensor Message Missing
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module does not receive engine sensor messages.
Evaporator Temperature Sensor Open (Or Shorted)
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module detects high voltage (open) or low voltage (shorted) evaporator temperature sensor signal circuit.
EVIC Message Missing
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module does not receive the EVIC message within 8 seconds.
Front IR Sensor & Control Head Mismatch
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module receives conflicting information between Infrared (IR) sensor and set temperature of ATC control panel.
Front IR Sensor High
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module reads front Infrared (IR) sensor value is greater than 250 counts.
Front IR Sensor Low
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module reads front Infrared (IR) sensor value of less than 5 counts.
Front IR Sensor Not Calibrated
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module cannot read Infrared (IR) sensor values, or IR sensor values are not within a desired range of HVAC door motor counts.
Front Mode Door Not Responding
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module does not receive feedback pulses within 5 seconds for the time the drive voltage was applied.
Front Mode Door Travel/Range Too Large
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is greater than expected.
Front Mode Door Travel/Range Too Small
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is less than expected.
Passenger Blend Door Not Responding
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module does not receive feedback pulses within 5 seconds for the time the drive voltage was applied.
Passenger Blend Door Travel/Range Too Large
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is greater than expected.
Passenger Blend Door Travel/Range Too Small
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is less than expected.
PCI Bus Shorted High
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module detects a short to voltage on PCI Bus circuit.
PCI Bus Shorted Low
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module detects a short to ground on PCI Bus circuit.
Personality Message Missing
Monitored every 8 seconds, with ignition switch in ON position. DTC/fault message sets when ATC module does not receive personality message within 8 seconds.
Rear Blend Door Not Responding
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module does not receive feedback pulses within 5 seconds from when drive voltage was applied.
Rear Blend Door Travel/Range Too Large
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is greater than expected.
Rear Blend Door Travel/Range Too Small
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is less than expected.
Rear Fan Potentiometer Shorted
Monitored with ignition switch in ON position. DTC/fault message will set when ATC module reads rear fan switch value, and it is less than 5 counts.
Rear IR Sensor High
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module reads rear Infrared (IR) sensor value, and it is greater than 250 counts.
Rear IR Sensor Low
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module reads rear Infrared (IR) sensor value, and it is less than 5 counts.
Rear Mode Door Not Responding
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module does not receive feedback pulses within 5 seconds from when drive voltage was applied.
Rear Mode Door Travel/Range Too Large
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is greater than expected.
Rear Mode Door Travel/Range Too Small
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is less than expected.
Rear Mode Potentiometer Circuit Open
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module reads rear mode selector switch value of more than 250 counts.
Rear Mode Potentiometer Circuit Shorted
Monitored with ignition switch in ON position. DTC/fault message sets when ATC module reads rear mode selector switch value of less than 5 counts.
Recirculation Door Not Responding
Monitored with ignition switch in RUN position. DTC/fault message sets when ATC module does not receive feedback pulses within 5 seconds for the time the drive voltage was applied.
Recirculation Door Travel/Range Too Large
Monitored with ignition switch in RUN position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is greater than expected.
Recirculation Door Travel/Range Too Small
Monitored with ignition switch in RUN position. DTC/fault message sets when ATC module monitors door travel/range during system initialization, and the measured travel/range is less than expected.
Refrigeration Pressure Message missing
Monitored every 8 seconds, with ignition switch in ON position. DTC/fault message sets when ATC module expects an A/C pressure sensor signal and does not receive the signal within maximum time allowed.
Vehicle Odometer Message Missing
Monitored every 8 seconds, with ignition switch in ON position. DTC/fault message will set when ATC module does not receive vehicle odometer message from Powertrain Control Module (PCM) for more than 5 seconds.
Vehicle Speed/RPM Missing
Monitored every 8 seconds, with ignition switch in ON position. DTC/fault message will set when ATC module does not receive vehicle odometer message from Powertrain Control Module (PCM) for more than 5 seconds.
VF Dimming Message Missing
Monitored every 8 seconds, with ignition switch in ON position. DTC/fault message sets when ATC module does not receive Vacuum Florescent (VF) dimming message from Body Control Module (BCM) within 8 seconds.
VIN Message Missing
Monitored every 8 seconds, with ignition switch in ON position. DTC/fault message sets when ATC module does not receive Vehicle Identification Number (VIN) message within 8 seconds.
7/12/2008
Saturday, July 12th, 2008 AT 10:30 PM
