Skip the auto shop - Our mechanics make house calls

Q: Can't get heat to work

asked by on

Truck just out of 10 yr storage...I have changed thermostat,blew out interior vents,checked mechanical linkages to controls.flushed heater core.I'm at my wit's end

My truck has 125000miles.
My truck has a manual transmission.been advised to explore vaccum system

A: This may be related to a faulty blower moto...

This may be related to a faulty blower motor or blower motor relay. The blower motor is a unit inside your vent system that blows warm air from the heater core to the vents when the heater is on or cool air from the air conditioning system when the A/C is on. There is a blower motor relay that supplies power to this motor when you turn the switch to "on" that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all. There is also a blower motor resistor that controls the various speeds and functions of the blower motor once it is turned on. I would recommend having an expert from YourMechanic come to your location to diagnose your blower motor and vent system.

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: Driver's side window not going down even though motor works.

The noise that you are hearing is in fact the motor working. However, the connection between the motor and your window has failed. The likely culprit is the window regulator. A series of cables and pulleys moves your window up...

Q: Running lean on bank 2

Hello and thanks for writing in. Code P0174 relates to a lean fuel condition which is typically caused by a faulty mass air flow sensor or potentially a vacuum leak beyond the mass air flow sensor causing the reading of...

Q: valves rattling bad

This could be caused by a variety of things such as excessive valve clearance or a push rod lifter that is not working correctly. This can require an extensive amount of time and diagnostic work. I would recommend having an...

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...
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...
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...