Q: Temperature guage stays on cool, heat inside is not very warm

asked by on

While driving with heat on, I noticed that it wasn't heating like it should inside the car, not warm enough. Also noticed the temp guage never raised off the cold on a 10 mile trip. Could this be a sensor problem? Or more likely the thermostat needs to be replaced?

My car has 190000 miles.
My car has an automatic transmission.

If your heater is not getting warm enough and the engine is not reaching operating temperature for a long time then your engine most likely has a thermostat that is stuck open. A stuck open thermostat can be verified by a mechanic like one from YourMechanic. The mechanic will start and run the engine to check the cooling system to see if the thermostat is causing the engine to run too cold. If it is stuck open then it will cause the heater to not get warm enough and the engine running too cold will get poor fuel mileage. Have the thermostat tested and replaced then run the engine to see if the engine comes to operating temperature within about 3 minutes running the engine at 1500 to 2000 rpm. Then recheck the heater operation and it should work correctly.

Was this answer helpful?
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. Temperature guage stays on cool, heat inside is not very warm

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: Check Engine light on; transmission leak

The coolant temperature sensor is likely what caused your Check Engine light. Sometimes aftermarket manufacturers produce parts of a lesser quality than the OEM. However, this does not mean that all aftermarket manufacturers produce faulty parts. It is harder to...

Q: My car needs a throttle body cleaning, but I'm worried about the idle and relearning process

Hi there. This is a very good question that I wish more people would ask. Your 2006 Pathfinder's engine control unit (ECU) does evolve and learn as it goes. Anytime you clean the throttle body or complete major "routine" service,...

Q: How do I know if my water pump has went out?

Hello, a coolant pump can fail three different ways: leaking, noise, or low to no flow of coolant. Leaking would be associated with a loss of coolant and needing to add coolant back into the system. This could also be...

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.