Skip the auto shop - Our mechanics make house calls

Q: Coolant reservoir overflows while air conditioning is running

asked by on

Car doesn't overheat but my coolant reservoir tank overflows while I have my a/c running. Why is this happening?

My car has 55000 miles.
My car has an automatic transmission.

A: Hello, A few different items can cause the ...

Hello, A few different items can cause the coolant reservoir to overflow. If this is going on while the vehicle is not overheating, it is a bit less common.

The most likely causes would be a failure of one of these components:

When the AC is on, it puts a slight strain on the vehicle, which takes up some of the available horsepower.

A qualified Technician such as one from YourMechanic will be able to diagnose your coolant reservoir tank overflow fault and perform any repairs required.

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・Save up to 30%

Get a quote

What others are asking

Q: Coolant leaking from engine head gasket

Head gaskets can leak in several ways. It can be an external coolant or oil leak, coolant can leak into the combustion chamber and vise versa, and coolant can leak into the oil. This is not a repair to delay....

Q: Possible fuel pump problem

The information provided for you Chevy Corsica is unfortunately a bit limited. If your problem is the ability to pump the gas into the gas tank itself, you may want to try pulling back the black accordion portion of the...

Q: What does the daytime running lamps (DRL) on light mean?

The daytime running lamps (DRL) on light is located on your instrument panel. When the DRL on light is illuminated, the DRLs are in use. When the DRLs are turned off, the DRL on light will disappear.

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...