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Why won't HVAC turn on?

HVAC will not engage, no fan or anything else will turn on

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Missing variable control voltage on the blower fan control module on a 2008 Buick lucerne


What are you using to test this control signal ? Were you on right wire ?
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, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts 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.

Chevy Trailblazer EXT Blower Motor Won Turn Off The blower motor in this video don't shut off , but he show's how to test the PWM signal right !
Your blower motor control module is probably bad , or HVAC control panel is bad , or a wiring problem !

Sep 26, 2016 | 2008 Buick Lucerne CXL

1 Answer

I have a loud ticking in the passenger side of the dashboard as you turn the ignition on


HVAC controls and possible flapper door not engageing and/or broken.
try keeping HVAC controls off while starting car. its prob heater related.

Dec 05, 2014 | Cars & Trucks

1 Answer

2002 hyundai xg350 a/c will not engage


The engine computer controls the ground signal going to the ac relay as well as the fan relays. You'll need a shop manual to get the testing procedures for the HVAC system. It could be one of the pressure switches or something else.

Jun 29, 2013 | Cars & Trucks

1 Answer

When I turn my electric furnace on the contacter won't engage but fan on works and so does the a/c. still heater won't operate?


At the thermostat jump the red wire to the white wire. This will eliminate the t stat. The contact or only initiates on a heat pump system.

Feb 27, 2013 | Heating & Cooling

1 Answer

Fan on my hvac split system won't stop running


Hello, sounds like the contactor coil is stuck which keeps sending power to the motor. Change out the contactor.

May 06, 2012 | Heating & Cooling

2 Answers

1995 318i ac fan won't come on


You will probably need to replace the resistor behind the dash. Usually the first symptom is the fan will only blow on high but not on the lower speeds. If that is the case, then the resistor ( cheap fix) is the culprit.

If you just lost it all of a sudden, you should check for a bad fuse and will probably find other things that don't work too. Replace the fuse and watch to see that it doesn't go out again - which if it does, you have a short somewhere that needs to be fixed.

Aug 06, 2011 | 1996 BMW 318

1 Answer

There are two small fans on in the ceiling. A small round vent on the driver's side in the back, and one in the front by the driver. It is loud and squeaking and won't turn off. What are these...


{: ) They are called the inside air temperature sensors. The HVAC module on your vehicle monitors the feedback from these sensors and helps regulate the climate comfort inside the vehicle according to your preferred settings. Yes it has this tiny fan inside, and if the noise is loud and annoying to you, the only fix is to replace it.

May 30, 2011 | 2003 GMC Yukon XL

1 Answer

The heater fan won't stop, even if i turn off the key the fan still turn, unable to control it, it only turn at one speed (not the fastest one), i check the resistor it look like there's a short in it, the...


Your impala doesn't have a resistor , it has a blower motor control processor and it doesn't work the way you think it does
Chevy Trailblazer EXT Blower Motor Won Turn Off
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, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a PWM signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts 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.

HVAC Blower Motor Circuit

May 27, 2017 | Chevrolet Impala Cars & Trucks

1 Answer

Aprilaire 700. It works on fan on mode but not otherwise. It's never on and the humidity reading is always way below the setting. It should turn on automatically to bring the humidity up, right?


It appears your Aprilaire model 700 is wired to only operate when your HVAC fan is operated by your thermostat. Your HVAC installer can wire the humidifier control to operate the humidifier during a heat call, fan call or to turn on the fan when there is a need for humidification. Please contact your HVAC installer to have them change the wiring.

Thank you for giving us the opportunity to be of service
Sincerely,

Brad Uselmann
Technical Support
Research Products Corporation
www.aprilaire.com

Nov 01, 2010 | Aprilaire 700 Humidifier

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