Skip the auto shop - Our mechanics make house calls

Q: No heat in cabin

asked by on

I changed the thermostat and flushed the heater core, still no heat

My car has 153000 miles.
My car has a manual transmission.

The first thing to check is for both heater hoses going into the heater core to be hot. If one is hot and the other cold or just warm where the other one is hot then you have a blocked heater core. If both hoses are hot then the problem is inside the vehicle on the blend door of the heat control. The blend door has an electronic actuator then may be not moving the door or the door is stuck or broke inside the case. Remove the actuator if it is not moving when checked. Test the door manually to see if it moves freely and controls the temperature for you. Replace actuator and calibrate the actuators.

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 is a saturn vue 05. It starts will shift all gears. But it's not moving when I put into gear. Even in natural it won't move

Hi there. Let's begin with the "N" position for the gear selector. That is neutral, or no direction meaning that the car does not move on its own power in that gear; only if you and possibly help from friends...

Q: Key won't turn in 2003 Saturn L200

This is a very common problem with the type of vehicle you have. If your ignition key looks worn down at all the key will need to be replaced. On some occasions the lock cylinder will need to be replaced...

Q: Heater blows out cold air

It is very possible that the coolant level in your 2014 Dodge Dart is low. The symptoms you are describing are almost always caused by a low coolant level. Likewise, low coolant level means there is likely a leak somewhere....

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.