Skip the auto shop - Our mechanics make house calls

Q: Heating doesn't work and the face plate unresponsive

asked by on

My car does not heat, which is a big issue when the weather is cold. Nothing works and there is no heat from the AC. The face plate, which controls the heat outlet, doesn't function at all. It is unresponsive. I replaced the body control module as well as the heater box but it hasn't helped. I haven't found any wires that are worn or loose. Do you have any suggestions how I can fix this?

When you say the heater box, I assume you mean the heater core. If nothing happens on any temperature setting, the blower motor, blower motor resistor (which also houses the relay) or HVAC control unit may be faulty. The problem could also be in the blower motor control circuit wiring.

When you turn on your heat, AC, or vent, power flows through a fuse to the HVAC control unit, to the blower motor resistor and finally to the blower. If only the heater does not work, suspect cooling system issues such as faulty thermostat or air in the coolant. A failed blend door could also be obstructing heat flow.

A trained professional, such as one from YourMechanic, will be able to diagnose the heating issue in your vehicle firsthand.

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: My car cuts off when service park assist pops up. What can be causing this problem?

Hi there. The parking assist works with sensors around the vehicle to view any obstacles on the road to prevent any accidents. If the parking assist is stalling your vehicle, then the sensors are either dirty or damaged. I recommend...

Q: Trunk broken

The door latches are a common failure. Each door will need to be separately diagnosed, since they may have different broken pieces. I recommend that you have a mechanic, such as one from YourMechanic, inspect your door latches, and have...

Q: Engine is getting warm, heater is only blowing warm air when the vehicle is moving. 2003 Jeep Grand Cherokee

Hi there - this sounds like a possible thermostat (no allowing proper warm-up to operating temperature), or an inadequate water flow (water pump or clogged radiator) problem. The lack of heater function could have 5 causes: the engine is not...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...