Skip the auto shop - Our mechanics make house calls

Q: Engine loses power when i put radiator cap on

asked by on

I put a new radiator in after my other radiator crack and made my car over heat. Now when I start the car which takes longer then usual the engine lose power and cutoff when I put the radiator cap on but if I pull it off fast enough the engine idles back up to its normal level any ideas

My car has 200000 miles.
My car has an automatic transmission.

When you overheated the engine before when the radiator broke, you must have blown the head gasket. Have the radiator pressure tested to see if the engine cylinder gets coolant in to the cylinders. This will indicate a blown head gasket and possibly a cracked head. If you want to have this checked, a certified mechanic can come to your home or office to inspect the car’s loss of power and verify what the issue is.

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: Truck is overheating and the heater is blowing cold air.

Hi there. There is a blockage in the engine preventing the engine from cycling the coolant. If there is a new water pump and a new thermostat, then the coolant should be cycling. Check the radiator for any blockages. Drain...

Q: Car shakes, rpm needle drops to 400rpms and slow acceleration

Hello, There are a number of reasons that may cause the check engine light to come on and the engine to shake. Shaking or vibration may be caused by many different things such as faulty spark plugs, poor fuel pressure...

Q: Water is leaking into the front cabin

The procedure for keeping the water from getting into the cabin will depend greatly on figuring out where the water is coming in. It could come in at the sunroof, door seals, windshield seal, window seal, or any place else...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.