Skip the auto shop - Our mechanics make house calls

Q: Overheating and heater not working

asked by on

My vw passat is overheating and beeping saying check coolant level. Coolant levels are great but I have no heat and it's overheating. What could this be. Is it my thermostat? Cause I have coolant and I'm not leaking any I can only think of two of three possible things either it's my thermostat or my water pump but I'm not leaking so I canceled out the option of the water pump so I can only think of a sensor or my thermostat

My car's transmission is unknown to me.

It sounds like you may have a faulty thermostat as well as a bad coolant temperature sensor. If the coolant is not getting to the heater core, then this would indicate a bad thermostat or a clogged heater core not allowing warm coolant to pass through it. If it is a bad thermostat, this may explain both issues as the thermostat being stuck closed would cause the engine to overheat, which would also prevent warm coolant from getting to the heater core. I would start with checking and replacing the thermostat first since this may solve both problems. If this does not solve your issue, this may suggest a faulty coolant temp sensor causing the overheating reading and potentially a bad heater core causing your heating issue. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your car.

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: Coolant leak causes smoke, periodic abnormal engine temp, and no heat inside.

Hi there. Look all over the cooling system for any coolant leaks. When the engine smokes in the mornings, look to see where the smoke is coming from. If a core plug (freeze plug) is leaking, then the coolant will...

Q: Heater fan work's. After about. A half hour heat gets less. Fan still works. But no heat.

The lack of heat being generated by your system may indicate a faulty heater core. The [heater core]((https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this...

Q: Car won't start - 2003 Volkswagen Passat

Hey there. Unless you've been experiencing other symptoms, it's probably not the fuel pump. But that's easy enough to determine by performing a fuel pressure test. A car that struggles to idle and then dies might have trouble with a...

Related articles

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...
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.