Skip the auto shop - Our mechanics make house calls

Q: Heater not working - 2002 Chevrolet S10

asked by on

I replaced the water pump, thermostat and heater core. Srill only blows warm. Temp actuactor is working

My car has 157000 miles.
My car has an automatic transmission.

Hi there. It sounds like you may have a blend door motor failure. The blend door motor moves the blend door inside the HVAC case to literally blend the air temperature out of the vents by directing the airflow accordingly across the heater core and the evaporator. Remove the glove box door and inspect the blend door motor to see if it is moving when you change the temperature accordingly. If it moves, make sure whether the door is moving as well. The gear on the blend motor is known to fail. If this is the case, replace the blend door motor and recheck the operation and for heat. If you would like to have the fault verified, a qualified pro from YourMechanic can come to your car’s location to diagnose the heating problem and assist with repairs.

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!
  1. Home
  2. Questions
  3. Heater not working - 2002 Chevrolet S10

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: Heat in the front won't work

Hi there. The front heater core my be restricted. A cooling system flush may resolve the problem. It may be a faulty temperature blend door actuator if the blower motor is still not operational. Checking the fuse would be in...

Q: My car will crank and doesn't start - delayed in the AC

Your Audi is known for having timing chain issues. This is the first thing I would suspect. The timing chain tensioners fail and the chain will jump teeth and damage valves. At the very least you will need the timing...

Q: Car making rattling noise

Hi. I will assume you have had your passenger side hub bearing replaced. On an all or four wheel drive Envoy's, there is also a drive axle up front that applies power to the front wheels. This only applies in...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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...