Skip the auto shop - Our mechanics make house calls

Q: Slight overheat low coolant

asked by on

Heater blows cold air. Low on coolant 3 months ago.filled it fixed heat issue. Oil change at that time. No coolant in oil. Does not blow white smoke or drip out of exhaust. Low on coolant again at this time, now overheats a little bit but not all the time. No visible leaks. Cooling system was pressure tested last time it was low by dealership. No pressure leak. Another Nissan mechanic said it has open system and is normal.

A: This could be caused by a variety of things...

This could be caused by a variety of things such as low coolant levels, a clogged heater core, a faulty thermostat, a faulty blower motor or heater core bypass hoses that are leaking. I would also recommend checking the water pump to be sure it is operating as it should. I would suggest having an expert from YourMechanic come to your home to diagnose and repair.

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: Driver's window not working

The window switch would need to be checked to see whether or not it is sending power to the motor. If it is, than the motor may be bad. If the motor is moving, but nothing moves in turn, then...

Q: Had oil and battery changed, and now the car will not start.

It is possible that during the battery replacement and oil change that something was unplugged accidentally. It is also possible that the battery could have been installed incorrectly. If the engine is cranking it is turning over. If everything was...

Q: lately my van often doesn't start on the 1st, 2nd, or thirtieth try.

Hello. First of all, 500 amps is too high. Most starters pull 150-300 amps. With the other symptoms you describe, I am fairly certain you have a bad connection in the starting system. Starting systems have two circuits. One...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...