Skip the auto shop - Our mechanics make house calls

Q: Overheating and leaking from around the heater core

asked by on

My Pathfinder is overheating. Its is leaking from the back by the heater core, but I cannot tell from where exactly.

If your engine is leaking coolant, this is the reason for the overheating. The cooing system requires a specific level of fluid in order to function properly. If the fluid is leaking by the firewall near the heater core, the heater core may have a crack in one of the tubes that the hoses connect to or the hoses themselves could be leaking. I would recommend having a professional perform a cooling system pressure test on your vehicle to determine where the leak is coming from. Once this has been found, repair the problem as soon as possible to prevent engine damage due to overheating.

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. Overheating and leaking from around the heater core

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: replaced oil pan gasket, engine and trans mount Jaguar Stype

Hello, thank you for writing in. It is always disheartening to hear these reports. From here you are going to want to either take it back to the original mechanic with the complaint, and discuss any further charges to take...

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: My polo 3 won't start when engine is warm or exposed to the sun for a long time

Hi there, The problems you are having with your vehicle, may not be easy to diagnose. Apparently, under hood temperature and ambient temperature both create the no start condition. Components can act-up with temperature change. Assuming no check engine light...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...