Skip the auto shop - Our mechanics make house calls

Q: After a 356 mile commute, my car overheated and anti-freeze was all over my engine and under the hood. No apparent leaks.

asked by on

This is the first time this has happened. Is it possible that it is just a bad radiator cap? What else can it be ? What do you suggest I do? There are no apparent leaks and my reservoir was basically full before my trip. Now, it was empty but remains full as I poured more into the reservoir. Only heats up as I press on the gas.

My car has 100000 miles.
My car has a manual transmission.

A: Hello, thanks for writing in. I'd be ha...

Hello, thanks for writing in. I'd be happy to provide my insight.

It may be possible that a bad cap was the cause of the coolant under your engine. Radiator caps are designed to hold a specific pressure that is generated by the cooling system as it comes to operating temperature. The temperature rises the cooling system pressure, so therefore the pressure on the cap also rises. A weak or worn out cap may not be able to hold the cooling system pressure, which may result in a leak. I would refill the system, purge it properly, and then see if the issue persists or the leak reveals itself.

If you would like help with inspecting your radiator cap or need your car inspected, consider having an expert automotive technician from YourMechanic come to your home or office to perform an inspection or repair for 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・Save up to 30%

Get a quote

What others are asking

Q: Ball joint fell off

I would ask one of the mechanics at YourMechanic to come to you and replace the broken ball joint so your vehicle will be drivable again. When you book your appointment, be sure to indicate whether it is the front...

Q: My truck won't start, battery is good, alternator is good, don't know if its starter, was told might have to change neutral lock.

You will need to test the small yellow wire with a blue stripe that goes to the starter and powers it when the ignition switch is turned to start. If the the wire checks out with power then the problem...

Q: Coolant is leaking, but vehicle not overheating.

Hello, a coolant leak with no external leaks leads me to believe you might have an internal leak at the head gasket. The first thing to do would be to check the oil and see if it looks like chocolate...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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.