Skip the auto shop - Our mechanics make house calls

Q: Leakage near the radiator fill cap and the AC/Heater doesn't work

asked by on

Hello There,

In my Nissan Altima 2003 antifreeze coolant is leaking, looks like it is leaking around the radiator fill cap. we went to the mechanic and he told us to there is a problem with the water pumps. There is noise after starting and goes after 2 3 minutes. But the car is running good. there is no engine over heating sign or check engine soon sign. only thing is coolant leakage and another problem is AC and heater heater doesn't work only fan sound comes out.

please help me with this problem.

thank you.

A: It sounds like you have 4 issues: Coolant...

It sounds like you have 4 issues:

  1. Coolant leak

  2. Possible issue with the water pump

  3. An unexplained, but transitory noise

  4. HVAC faults.

The coolant leak is the most important one to fix first because a coolant leak can eventually cause overheating which will basically destroy an engine by warping metal parts so I encourage you to resolve the leak promptly. The water pump issue would have to be "explained". Not sure what your Mechanic saw or suspected but if there was a problem it should have been stated to you with specificity (e.g., pump is leaking; pump is noisy; pump drive belt is loose; pump flow is inadequate).

YourMechanic can take the general observation you received and, after inspection, put the diagnosis in concrete terms for you (if the pump is even bad). Momentary engine noises, at start-up, can be due to initial lack of oil pressure, belt pulleys (bearing issues), or like problems. These are relatively easy to evaluate on inspection, particularly if they are momentary. And, the serpentine belt can be temporarily removed thus quickly distinguishing between "engine" noise and noise from the accessory devices driven by the belt.

The AC system and the heater are distinct systems for the most part, excepting they share common air vent pathways. This is the last thing to fix though. The leak, the water pump and the noise issue should all be resolved before you put any money into HVAC repairs (in the olden days, cars did not even have HVAC systems).

To avoid any unnecessary repairs, YourMechanic would be pleased to diagnose your coolant leak issue for you and address any further concerns you might have. Please let us know how we can assist you!

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: Small leak in hose.

Hello. A small coolant leak should be repaired right away to prevent any damage due to overheating. Luckily you have already spotted the leak, as many leaks can be hard to find and repair. If the hose itself is leaking...

Q: Car leaks coolant when left overnight

Hi there. In some instances, after a radiator is replaced, a coolant line can be left loose by accident or can come loose as the hose clamp gets hot. If the car is parked on a slight uphill slope, the...

Q: The heat control dial on my dashboard broke. The plastic connector snapped in half.

Hi. The best and really the only thing for you to do in this situation is to replace the climate control unit. The dail that has broken is sold as part of the entire climate control unit. You can not...

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...
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...
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.