Tip & How-To about 2007 Fiat Grande Punto

Repair ventilator / habitacle ventilator no longer working

The ventilator motor is controlled by a voltage regulator: 2 thick wires + 12 Volt and 0 go in and 2 thick wires go out to the motor. The speed is controlled by a two wire smaller connector.



When finding that your ventilator is no longer working, it may be that the connectors to the regulator are burnt.
See picture.
The voltage regulator (see picture below):
You can dismount is without removing the fan; but it may be that you need to dismount an air duct (1 Torx T20).


If you do not have a 5.5 mm tool, simply squeeze a 6 mm a little bit (not useful anyway):



Best way to repair it using faston or similar clips that you solder to the vehicle wiring.



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My 2003 Astro vans rear heater works great but the front only blows cold air


temp. blend door actuator is probably bad .
Air Temperature Actuator
The air temperature actuator is a 3 wire bi-directional electric motor. Ignition 3 voltage, ground and control circuits enable the actuator to operate. The control circuit uses a 0-12 volt linear-ramped signal to command the actuator movement. The 0 and 12 volt control values represent the opposite limits of the actuator range of motion. The values in between 0 and 12 volts correspond to the positions between the limits.
When the HVAC control assembly sets a commanded, or targeted, value, the control signal is set to a value between 0-12 volts. The actuator shaft rotates until the commanded position is reached. The module will maintain the control value until a new commanded value is needed.

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The HVAC control assembly is a non-class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and settings. The battery positive and ignition 3 voltage circuits provide power to the control assembly. Two integrated potentiometers control air temperature door position and blower motor speed. The integrated vacuum system controls the mode door position. The control assembly supports the following features:

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1 Answer

I have a 2008 Chevrolet Uplander and we are looking to replace a fuse for the rear air. Can you tell me where it is located?


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Auxiliary Air Speed
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1 Answer

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Which system ?
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If automatic it's probably the blower motor control processor .
Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, Blower motor speed signal, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module sends the commanded blower motor speed to the control processor through a 0 to 12-volt linear ramped blower motor speed control circuit. As the blower motor speed control voltage increases, the blower motor speed increases. The control processor sends the actual blower speed to the control module through a 0 to 12-volt blower motor speed signal circuit. The processor supplies 12volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

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1 Answer

2009 Chevrolet impala has a clicking noise in the heater and ac system


That is more then likely a blend or a mode door actuator , they have plastic gears inside that strip an get stuck an then they just click .
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The mode/recirculation 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 coordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 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.
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Your have to figure out which side of the heater box the noise is coming from . The Temperature Valve Actuator Replacement - Right Side - the glove box needs to come out to get to it .
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the driver side knee bolster needs to be removed

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1 Answer

2004 Dodge Dakota


Replace your resistor if you haven't already. I had the same issue with mine, it only worked on high.

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