Question about 1998 Dodge Caravan

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Changed batteryand now the hvac lites are on - 1998 Dodge Caravan

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You need to recalibrate the climate control system.

  • Start the van.
  • Slide the temperature lever all the way to the left (full cold).
  • Turn the Mode Control to 'panel' (the one that sends air to your face only).
  • Turn the 'blower switch' to all the way to full.
  • Now go to the leftmost three buttons. Press and hold the top one (rear wiper on constant) and the bottom one (rear wiper washer fluid) until the lights come on solid then begin to flash, and then you can let go.
  • The AC will now calibrate. You will feel the air blow out of all the different zones at different intervals and see lights come on and go off. Then after a minute or two the top button you pressed will be slowly flashing. This means it has been completed.
  • Press the last flashing button and you are done.

Posted on Jan 02, 2011

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Posted on Jan 02, 2017

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HVAC mode selector does not work and displays a continuously changing condition


Do you have manual or automatic HVAC system ?
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Or automatic HVAC ?
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May 14, 2016 | 1999 Oldsmobile Intrigue

1 Answer

My heater is stuck on the windshield and floor what actuator needs to be changed


Air Distribution
The HVAC control module controls the distribution of air by the use of a defrost actuator and a mode actuator. The modes that may be selected are:
?€¢
Defrost


?€¢
Defog


?€¢
Panel


?€¢
Bi-Level


?€¢
Floor

The mode and defrost actuators are connected to the mode and defrost doors by a cam type linkage system. Depending on the position of the door, air is directed through the HVAC module and distributed through various ducts leading to the outlets in the dash. If the HVAC control module detects a fault with the mode or defrost doors the HVAC control module will try to drive the actuator for a predetermined amount of time, to defrost, which is the defaulted position for the mode and defrost door actuators. When the mode switch is placed in the defrost or defog positions the A/C is commanded on and the recirculation door is moved to the outside air position to help reduce window fogging. A/C is available in all modes and recirculation is only available in the panel and bi-level modes.
Circuit Description The following DTCs are for the HVAC door actuators: ?€¢
B0248 is for the defrost actuator.
?€¢
B0263 is for the mode actuator.
?€¢
B0408 is for the left air temperature actuator.
?€¢
B0418 is for the right air temperature actuator.
The HVAC control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of a stepper motor, a logic circuit, and a potentiometer. The potentiometer inside the door actuator allows the module to monitor the current position of the actuator drive shaft. The logic circuit inside the actuators receives control signals from the HVAC control module and controls the internal stepper motor. When a door positional change is required, the HVAC control module calculates a commanded door position. The module compares the commanded door position to the actual door position and determines the needed direction of motor rotation. The module applies a signal voltage to the door control circuit that is an input to the internal logic circuit of the door actuator. A 5 volt signal increases the door position. A 0 volt signal decreases the door position. When the commanded door position is equal to the actual door position, the HVAC control module sends a 2.5 volt signal to the door actuator and motor rotation stops. The ignition 3 voltage circuit provides source voltage to the logic circuit. The module provides ground to the actuator logic circuit through the low reference circuit. I would start by having the HVAC control module checked for DTC'S -diagnostic trouble codes First . Then check the system by using scan tool data . 1
Did you perform the HVAC Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - HVAC Systems - Manual

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the appropriate HVAC door actuator ON and OFF while observing the corresponding Door Actual parameter.
Does the scan tool indicate that the value of the appropriate Door Actual parameter changes?
Go to Diagnostic Aids
Go to Step 3

I would

Apr 02, 2016 | 2003 Chevrolet TrailBlazer

1 Answer

Changed battery in my 2004 GMC Envoy and now my a/c only blows from the dash and rear vents. What could be wrong and where is the part located on the vehicle?


There are a couple of possibilities, one is that the HVAC system lost its calibration during the battery change or the actuator that controls the vent door has gone bad.
To recalibrate the HVAC system, set all HVAC controls and switches to OFF or fully CCW positions. Disconnect the battery for about 3 - 4 minutes, then reconnect the battery. Do not touch any of the HVAC controls for a few minutes, then try the controls to see if the air flows correctly.

Aug 01, 2012 | 2004 GMC Envoy

1 Answer

My 2001 chevy tahoe's a/c and blower on the front panel and the console above the center console does not work but the middle console's rear fan works. also the lights for the internal circulation,...


This is for front blower motor. The orange wire is voltage, hot all the time, fuse protected. The black wire is chassis ground, you can check both those wires with test lite. The top wire, control from hvac control module. That may be a pulse width modulated signal? This was for automatic hvac w/o roof.
bbbind.com has free wiring diagrams.
front blower motor-tok35otjw1i5wfk2bhubzpce-1-1.jpg

Dec 31, 2017 | Chevrolet Tahoe Cars & Trucks

3 Answers

1997 Tahoe,Blower motor only blowing on low.Changed the blower motor & still have the same problem.Is it the heater control being bad?Do these go bad? Thanks in advance Dave


gain room by pressing on right side of open glovebox. it should come off its hinges. just set it aside. you can see the HVAC box. Look on top of the HVAC box and a little to the left and you will see the blower motor resistor mounted snuggly. have a good day !

Feb 09, 2011 | 1996 Chevrolet Tahoe

1 Answer

My climate control unit in the dash doesn't turn on when I press any of the buttons. It is back lite but there no power going to the blower. The number display doesn't show any # when I turn the knobs. ...


2 wheel drive or 4 X 4 ? Automatic or manual climate control
Do you know what DTC'S - diagnostic trouble code's are ?
DTC B1375
The ignition 3 voltage circuit is a discrete input to the HVAC control module. The HVAC control modules uses the input to determine that the ignition switch is in the RUN position. When the ignition switch is in the RUN position, ignition voltage is applied to the input.
Rather then guessing as to what the problem , not being able to diagnose properly , your best bet mite be to have a qualified repair shop check it out . Would need to hook up a professional or factory scan tool to check code's ,see if the climate control module will communicate with the tool .
HVAC Control Module
The HVAC control module is a class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). If the battery positive voltage circuit loses power, all HVAC DTCs and settings will be erased from KAM. The body control module (BCM), which is the vehicle mode master, provides a device on signal.

Jan 03, 2018 | 2003 GMC Yukon XL

2 Answers

Broken heater coil


If you mean the heater core is leaking. Here is how to change it:

Heater Core Removal & Installation Heater core removal gm-10-00-589.gif

To Remove:
  1. Remove the HVAC assembly.
  2. Remove the heater core cover screws.
  3. Remove the heater core cover from the HVAC assembly.
  4. Remove the heater core gasket from the core.
  5. Remove the heater core from the HVAC module assembly.
To Install:
  1. Install the heater core to the HVAC module assembly.
  2. Install the heater core cowl gasket to the HVAC module assembly.
  3. Install the heater core cover and screws to the HVAC module assembly.
  4. Install the HVAC module assembly to the vehicle.
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Oct 18, 2010 | 2000 Chevrolet Silverado 1500

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