Skip the auto shop - Our mechanics make house calls

Q: Car still overheating, and hissing, even after changing the coolant.

asked by on

My coolant service light went off, so I went directly to the dealer to buy coolant. After changing the coolant the coolant service light went off again. I opened the hood and heard hissing noises. I believe it is a hose, but I can't determine which one.

A: Hi there. Some coolant leaks can be hard to...

Hi there. Some coolant leaks can be hard to find and may only appear when the system is under pressure. If you are getting a hissing noise it is possible that you have a leaking hose, but most of the time on this model VW it is caused by a leak in the radiator or the water pump. If the leak is not visible by looking around the engine compartment then it would be best to consult the help of a certified mechanic, like one from YourMechanic, that has a cooling system pressure tester. With this tool they can pressurize the cooling system in order to more easily identify the source of the leak.

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

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 engine

If the vehicle is presently overheating, you want to check, and perhaps just replace, the cooling system thermostat (thermostats are not costly and they do eventually fail), check the radiator for blockages (radiators can be flow tested) and check the...

Q: Wheel bearing going bad

A wheel bearing noise can be identified by a loud growling noise which can get louder with increased speed. A failed bearing can also be identified by jacking the vehicle up and checking for play or movement in the suspected...

Q: Brakes grinding

Brake noise is quite common. Most likely what you are hearing is the sound of the worn brake pads grinding against the rotors. This problem can usually be solved by a simple brake job. A trained professional will be able...

Related articles

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.