Q: If the thermostat is bad would it cause the heater core to not work properly?

asked by on

I have read online that if the hoses leading to the radiator from the thermostat are cold then that means the thermostat is bad, but would that be the reason why my defrost doesn't work properly? When I start the vehicle I smell what could be antifreeze, just not sure if I should jump to replacing the heater core or hope the thermostat dose the trick.

Hello - you are correct. If the thermostat is stuck open, not allowing the engine to warm up properly, there won’t much, if any, heat in the passenger compartment. However, if you are smelling coolant in the passenger area, chances are the heater core is leaking as well - not a happy occasion. I would recommend a heater inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, confirm this diagnosis, and give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. If the thermostat is bad would it cause the heater core to not work properly?

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: Overheating car after running for 30 minutes

Hello there, many different faults will cause your 2002 Chrysler Sebring to overheat after running for 30 minutes. The most common faults are the water pump, radiator, air bubbles in the coolant, or airflow ducting to the radiator. In many...

Q: Effects of an old engine thermostat

Yes this is actually bad. Get a thermostat. For most cars, they don't cost much, unless you own one of those V12 Jaguars, that you've got to take the intake manifold off to change it or a VR8 Volkswagen where...

Q: Thermostat - 2009 Mercury Milan

Hello there. This is a common issue with your Mercury Milan. If the coolant temperature sensor reads improperly, it will set the service engine light and require replacement. This sensor is located in the thermostat housing. You can buy the...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...