Skip the auto shop - Our mechanics make house calls

Q: No heat,defrost or air coming from front a/c vents

asked by on

No heat defrost or air coming from front a/c have replaced blower motor twice with in the last year everything work in back vents I noticed a sticky substance on the Connector to blower motor and on the resistor so I cleaned with connector cleaner re connected it and nothing happened but I did smell something burning

My car has an automatic transmission.

Hello - there a couple of possibilities here for this problem: the blower motor resistor pack, or the fan switch portion of the HVAC control itself. The blower motor resistor pack regulates fan speed in the Low or Medium positions, but NOT the high speed/Max position. If the fan works in the high speed or Max position, the resistor pack has failed. If you have no fan operation in any fan speed position, the fan switch or wiring (incl. ground wire) has a problem and will need further diagnosis. I would recommend having a Heating-AC Inspection completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Door lock problems

Hi there. There is a resistor for the door locks that keep a voltage on the driver door lock cylinder to activate the secondary door locks electronically. If the resistor is leaking (losing power) it tends to cause the door...

Q: Unable to start the vehicle

sent to Customer Service

Q: Drivers side rear view mirror defogger not working and how do I repair?

Hello, thank you for writing in. The defroster within the mirror is rather simple. It uses a resistor to collect electrons which ends up resulting in heat. it is this heat that is used to defrost/defog the mirror. If the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.