Skip the auto shop - Our mechanics make house calls

Q: coolant coming out of radiator cap.

asked by on

My coolant is coming out of the radiator cap when the cap is off the car overheats but theres no smoke coming out the exhaust and the oil is not mixing with the coolant.

My car has 120000 miles.
My car has an automatic transmission.

Hello. If the engine is overheating then there can be a number of things going on. I usually test the radiator cap, the thermostat, and the cooling fans. Any of these can fail and cause this. If these have been replaced then it may be an internal engine issue. If the head gasket fails it can cause overheating without the smoke or water mixing with oil. A block test needs to be done first. If you want to have this done, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your overheating leak firsthand.

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

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: The top area of fiberglass radiator at times has residual antifreeze, temperatures gauges Sat. Will Preston sealant help seal any

While sealants like the product you mentioned may be acceptable for emergency repairs, I would not recommend it for this scenario. You need to replace your radiator before it fails during a drive. The leakage you describe is the initial...

Q: car wont start after changing crank shaft pulley

This sounds like potentially either a loose crankshaft pulley bolt or potentially stripped threads on this bolt. Either way, this has likely caused a problem with timing and potentially a variety of other issues. Since you can't get the car...

Q: Door popping noise

Hi, a certified technician would be able to inspect the exhaust system to find the leak. As for the door making a noise, typically it is from metal rubbing. You can check the seam in the panels for damage. If...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...