Question about Dodge Charger

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2008 Charger R/T hemi with dual zone HVAC: Shortly after replacing the ignition switch module, we started having problems with heat only coming from half of the dash/floor outlets. Then it quit heatin

My personal belief is that the problem is related to the ignition switch replacement that occurred just prior to the onset of these issues. I've seen several mentions of having the dealer "flash" the electrical system to cure other electrical problems. Would this be way off base?

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  • Dodge Master
  • 49,985 Answers

If you had the battery disconnected to replace the ignition switch the use a scanner to reset the CPU program

Posted on Mar 26, 2014

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6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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brainyass
  • 242 Answers

SOURCE: heater only blows warm air.

The hoses from your heater core should be very hot to the touch. Check the hoses going to the core from the water pump. It should be very hot. The return hose should also be very hot. Now check the hoses going to the core. If they are not the same temp, then your heater control valve is not working correctly or the vacuum is not working. At any rate, locate the vacuum line going to the heater valve. Remove the silver bar on the valve from the plastic plunger arm. You will have heat all the time now if it was only a vacuum problem. You can fix it later when it's warmer out. BTW a 200* thermostat will make your heater even hotter.

Posted on Nov 21, 2008

  • 651 Answers

SOURCE: heater blowing cold air

squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.

Posted on Jan 04, 2009

clesh01
  • 14 Answers

SOURCE: Inconsistent Starting, Won't turn over

wow, well its def a electrical issue.this almost same thing happened to my buddie 2000 trans am,the dealership replaced the ecm after 2 or 3 trips in there.his dash lights did the same thing and he had trouble starting it to,just not as regular as your problem.

Posted on Jan 09, 2009

  • 1861 Answers

SOURCE: 2002 Mercury Sable, Heating Problem

Hello. You are in luck. I just had this same issue in my shop this week. We changed the thermostat, and replaced the coolant. Fixed it right up. Since you did not mention a new thermostat, that would be my next move, if I were you.

Posted on Oct 09, 2009

  • 1 Answer

SOURCE: 2001 Oldsmobile Bravada no heat

You may have an air bubble in your coolant system. If so, use a large coolant funnel designed to purge out air bubbles. The funnel attaches to your radiator with cap removed. Check it out on line. It costs about $25.

Posted on Dec 28, 2009

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How to calibrate hvac module on 2004 gmc envoy only get from vents no defroster


Did you replace the mode door actuator ? Manual or automatic HVAC system .

When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following:
Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.
Place the ignition switch to the OFF position.
Disconnect the scan tool.
Install the HVAC control module.
Connect all previously disconnected components.
Start the vehicle.
Wait 40 seconds for the HVAC control module to self-calibrate.
Verify that no DTCs have set as current DTCs.
When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC actuator be sure to perform one of the following:

Preferred Method (w/ Scan Tool)
Clear all DTCs.
Place the ignition switch in the OFF position.
Install the HVAC actuator.
Connect all previously disconnected components.
Start the vehicle.
With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
Verify that no DTCs have set as current DTCs.
Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.
Alternate Method (w/o Scan Tool)
Clear all DTCs.
Place the ignition switch to the OFF position.
Install the HVAC actuator.
Connect all previously disconnected components.
Remove the HVAC B fuse for a minimum of 10 seconds.
Install the HVAC B fuse.
Start the vehicle.
Wait 40 seconds for the HVAC control module to self-calibrate.
Verify that no DTCs have set as current DTCs.

Feb 19, 2018 | GMC Cars & Trucks

2 Answers

Where can I get the heat control wiring diagram?


How do you know there is no B+ voltage ? Did you check with a volt meter ?
Red with white stripe wire gets power from AIRCON fuse 15amp I/P fuse box.
HVAC Control Module The HVAC control module is a GM LAN device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive and ignition 1 voltage circuits provide power to the control module. The control module supports the following features:
Is your HVAC manual or automatic ?
Is yours

Nov 26, 2015 | 2008 Saturn VUE

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

1 Answer

Had the battery changed, but now the (heat) vents in the top of the van and the floor vent (heat) does not work - only cold air comes out. Also, the heating/cooling dial lets it get hot midway on cold...


Try this calibration procedure and let us know if you have more questions:
  1. Start the vehicle.
  2. Wait 40 seconds for the HVAC control module to self-calibrate.
  3. Verify that no DTCs have set as current DTCs.
  4. Clear all DTCs.
  5. Place the ignition switch to the OFF position.
  6. With the Mode knob in the PANEL position, press and hold the AC button for 5 seconds.
  7. Rotate the Mode knob fully counterclockwise.
  8. Rotate the Mode knob fully clockwise.
  9. Rotate the Mode knob fully counterclockwise.
  10. Release the AC button.
  11. Wait 40 seconds for the HVAC control module to self-calibrate.
  12. Start the vehicle.
  13. Verify that no DTCs have set as current DTCs.

Nov 14, 2010 | 2005 Pontiac Montana SV6

1 Answer

No heat from dash vents


try this,
  1. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC B fuse for a minimum of 10 seconds.
  6. Install the HVAC B fuse.
  7. Start the vehicle.
  8. Wait 40 seconds for the HVAC control module to self-calibrate.
  9. Verify that no DTCs have set as current DTCs.

Nov 11, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Hum/noise on driver's side dash


No , there are no vacuum operated mode, temp. actuators ,there are all electric actuators . Is your lacrosse Dual Zone Control ? Could be a stuck temp. control actuator . Do you get both heat an cold from that vent . I'm assuming it's a vent when you say grid . Does you lacrosse have manual or automatic climate control ?
Air Temperature Actuators The air temperature actuator is a 2-wire bi-directional electric motor. Two control circuits enable the actuator to operate. The control circuits use either a 0 or 12-volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 12 volts. In order to move the actuator, the HVAC control module grounds the appropriate control circuit for the commanded direction. The HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction.
The HVAC control module determines the door position by counting motor pulses on one of the control circuits. These pulses are small voltage fluctuations that occur when the brush is shorted across two commutator contacts as the motor rotates. As the actuator shaft rotates, the HVAC control module monitors the voltage drop across an internal resistance to detect the pulses. The HVAC control module converts the pulses to counts with a range of 0-255 counts. The HVAC control module uses a range of 0-255 counts to index the actuator position.
The replacement of Temperature Valve Actuator Replacement - Left Side Is not difficult at all , Don't need to take the whole dash apart !
Remove the left closeout panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side. Disconnect the electrical connector from the left air temperature actuator. Remove the mounting screws from the left air temperature actuator.
Remove the left air temperature actuator.
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This is view of left side actuator .
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Mar 24, 2010 | 2007 Buick LaCrosse CXL Sedan

1 Answer

I have a 2003 jimmy that blows very little heat at level 4


It sounds like it could be the control panel or the A/C And Heater Control Calibration you can give this info to your mechanic... but if i were you i would go to gm dealer.replacing the wrong part will get expensive fast..... hopes this helps you..........................................A/C And Heater Control Calibration
Re-Calibrating Actuators (Primary)
When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following:Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.
  1. Place the ignition switch to the OFF position.
  2. Disconnect the scan tool.
  3. Install the HVAC control module.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. Wait 40 seconds for the HVAC control module to self-calibrate.
  7. Verify that no DTCs have set as current DTCs.
When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC actuator be sure to perform one of the following:Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted improper HVAC performance will result.
Alternate Method (W/O Scan Tool)
  1. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC B fuse for a minimum of 10 seconds.
  6. Install the HVAC B fuse.
  7. Start the vehicle.
  8. Wait 40 seconds for the HVAC control module to self-calibrate.
  9. Verify that no DTCs have set as current DTCs.
Preferred Method (W/ Scan Tool)
  1. Clear all DTCs.
  2. Place the ignition switch in the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
  7. Verify that no DTCs have set as current DTCs.

Dec 29, 2008 | 2001 GMC Jimmy

3 Answers

Temp controls unit intermittent, cruise control also


When looking at a power distribution schematic, the HVAC and cruise control share a dedicated feed from the ignition switch. It sounds to me like the switch has an intermittant fault, since the display is lit and then when cranked it goes dead (as it should) but the switch may never remake the contact when returning to run causing the loss of power.

Oct 07, 2008 | 2000 Oldsmobile Intrigue

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