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

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: Broken belt

Hello. Your particular vehicle only has one belt. This belt is called the serpentine belt. The serpentine belt wraps around all of your pulleys, driving the alternator, water pump, and power steering pump. When this belt breaks, the Battery Light...

Q: What's the cost for front and rear break pads on 04 mazda6?

Hi there. To request a quote to have your brake pads replaced, [simply click this link to the brake pad replacement page]https://www.yourmechanic.com/services/brake-pads-replacement)(. Once on that page, click the blue Get a Quote button and enter your information in the box....

Q: Intelligent key light

The intelligent key light is controlled by the ignition system for the anti-theft system to be active. There are many complaints of the problem caused by a steering lock system problem, which may need replacement to prevent this issue from...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.