Skip the auto shop - Our mechanics make house calls

Q: Heater issue

asked by on

My heaters work sometimes when the weather is ok they work sometimes recently the weather has been cold the heaters come on all nice hot air but then the heaters are on no air cold or hot i don't understand what is happening after a while they are up and running again has is got something to do with the battery?or anti freeze ?

My car has 72000 miles.

What you are describing sounds like an intermittent failure of the blower motor that circulates air in the HVAC system, however, there are certain faults that could occur in the electric circuit that powers the blower motor. If power is reaching the blower motor when the blower switch is in the on position and the blower motor is not functioning as intended then the blower motor is condemned and replaced. On the other hand, if there is no power, then the blower switch and the plug connection on the back of the switch, as well as the rest of the circuit should be inspected. If the circuit includes a blower motor resistor block, of course the resistor block has to be checked for continuity (i.e., specified resistance in ohms) at each position. If equipped with a relay in the circuit, that is easy to test and if the relay works consistently as commanded, you can assume there is no fault there. If you want these diagnostic steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a non functioning cabin heater diagnostic and the responding mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic.

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

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: No heat when it is cold outside?

Hello there, many faults will cause a lack of heat in your 2012 Ford Focus. When the air is not getting hot, the problem can either be with the air inside the car or a cooling system fault. The most...

Q: Low oil pressure light comes on when idle. Check engine light is on as well. Both came on after getting an oil change 3 days ago.

It is possible that they put in the wrong viscosity oil. In rare instances, a defective filter will also cause low pressure. If there is too much oil, it will aerate and cause low pressure. Be sure the oil level...

Q: the car will not shift into any gear, but the gear shift moves

Hello, this transmission type has a shift cable that routes from the gear shift to the transmission. The shift cable assembly may be broken causing this issue, this will require an inspection to confirm this. If you'd like, a certified...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.