Skip the auto shop - Our mechanics make house calls

Q: Heater is not working - 2003 Chevrolet S10

asked by on

2003 chevy s10. I had the radiator replaced a few months back the heat was working for 2 months after that but now does not work at all any suggestions to how I may fix this problem?

My car has 168000 miles.
My car has an automatic transmission.

A: Hello. A malfunctioning heater can be cause...

Hello. A malfunctioning heater can be caused by many things. The first thing I would do is check to make sure that the coolant is topped off at the proper level. If it is low, coolant may not be reaching the heater core, and no heat will be generated as a result.

It may also be possible that the heater control valve or the switch itself have malfunctioned. The heater control valve is the component that physically allows coolant to flow from the engine to the heater core, and the switch, the physical set of knobs that controls the system.

If either of these get stuck, leak, or otherwise malfunction, they can cause the system to not produce heat. Also be aware that issues with the heater are issues with the cooling system, and as such can sometimes cause overheating. I would start with checking the coolant level, when the engine is cool, and proceed from there. If you would like to have this checked, a certified technician from YourMechanic can come to your car's location to diagnose the heating problem so that this can be addressed.

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・Save up to 30%

Get a quote

What others are asking

Q: My van won't turn over to start it just clicks

It sounds like you may need a starter. The testing for it is pretty straightforward. Check the battery cable going to it, and check for power at the start wire. If there is power at both, it will need a...

Q: Car shuts off when put in to gear after turning on

Your car seems to be showing symptoms similar to a vehicle with a dirty or failing idle air control valve. This valve regulates airflow when the throttle plate is closed, and if clogged, you will have to usually keep the...

Q: Rough idle

There are several possibilities for a car to have rough idle. You may have a bad mass air flow sensor. I would suggest having the system checked with a scanner to see if all the engine sensors are reading the...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
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.