Technical Car Experts Answers everything you need: no heat problem on car

How to perform A/C-HEATER CONTROL CALIBRATION procedure

The Vehicle is 2006 Chrysler Town & Country.

The Calibration procedure helps many a times during No heat problems.

The heater blows no heat but only cold air.

In such cases the problem is due to faulty Actuator motor or problem with A/C heater control module.

But even after replacing these faulty or weak parts the problem remains the same.

On such cases performing the A/C heater control calibration helps.

The procedure is as follows :----

PLEASE NOTE:----

The A/C-heater control module must be re-calibrated each time an actuator motor or the A/C-heater control is replaced.

If the vehicle is so equipped, the calibration procedure also includes rear HVAC positions for each actuator motor.

The details are as follows:----

First of all turn the ignition switch to the On position.

There are two types of temperature control systems on vehicle.Manual temperature control system or Automatic temperature control system.

For manual temperature control (MTC) system,

Press and hold the Rear Wipe/Wash and Re-circulation buttons for at least five seconds.

The MTC A/C-heater control Rear Wipe/Wash button light emitting diode (LED) and Recirculation button LED, will begin to flash when the calibration procedure has begun.

And with the automatic temperature control (ATC) system,

Simultaneously press and hold the Power and Recirculation buttons on the A/C-heater control for at least five seconds.

The ATC A/C-heater control Delay and Recirculation graphics will begin to flash when the calibration procedure has begun.

TIME LIMIT:--

The calibration procedure should take less than two minutes to complete for the manual A/C-heater control, and less than twenty seconds for the ATC A/C-heater control.

When the LEDs or graphics stop flashing, the calibration procedure is complete.

ON Some cases the Flashing light will not stop:---

If the LEDs or graphics continue to flash beyond the two minute (manual) or twenty second (ATC) calibration time.

So here is the problem

These flashing lights indicates that the A/C-heater control has detected a failure and a Diagnostic Trouble Code (DTC) has been set.

On such cases the vehicle needs to be scanned by OBD tool to retrieve the error codes. These error codes will tell or indicate what part is causing the problem.

IMP NOTE:-- The LEDs or graphics will continue to flash even after the ignition switch is cycled Off and On, until a successful calibration is completed or until the vehicle has been driven about 13 kilometers (8 miles.That flashing is normal.

These details will help.

Thanks.

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Actually it starts heat,but after few minutes it quits heat.This problem is mostly and majorly noticed on 2006 Chevrolet Equinox car models.Many other 2006 Equinox users have also complained about this same exact problem.

Sounds like typical temperature door has broken int your Chevy Equinox.
It is buried inside the dash. When it breaks, you have no heat. Not electrical or any other problem.
This repair takes a good 8 hours to replace the $30 door. Entire dash, carrier, and HVAC case has to come out and disassemble.

Unplug and remove the temp actuator motor; if the door is broken the temp door tab will fall into the heater box.

For this same problem at out garage we noticed that the servo motor tries to over turn the shaft on the heat door at the extream cold and hot settings. You can hear the servo working if you listen on the passengers side under the dash with the engine off and the ignition turned to on.
This probably putting undue stress on the heat door shaft. I suggest only setting the temp control one notch short of full hot or cold settings to keep from breaking another door shaft.

One more good and easy procedure to confirm the problem

Quick way to check temp door, is vent position, A/C off.....

feel air flow at full cold.....

now go to full hot......

if air flow remains the same, temp door is not moving........

if it is much slower, than the door is moving....if that's the case, then you may have a coolant leak( low on coolant creating an air pocket) or plugged heater core.....but that would cause the vehicle to overheat.But that's not in your case.So temp door is the cause of problem.

To replace it, you will need to remove the entire dash board assembly, all related parts,
the cross car beam, then you can remove the heater air conditioning case.
The case must be disassembled to replace the door.
It costs about $40 at Dealer only.
This is an very big job. Takes approx 8 hours.

If you are not capable of such repairs,get it done by professional car tech or from Chevy dealer techs.

This will help.Thanks.

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