Q: There is a blow off valve type sound coming from the engine and then steam coming out.

asked by on

My wife went to start the car in the morning to go to work and it did not start. I jumped the car later in the morning and was letting it run. After a couple of minutes I heard a sound like a valve with too much pressure was blowing off and observed smoke which I later determined to be steam, due to the lack of smell. I turned the car off immediately and looked at the engine, I did notice on the left side towards the bottom there was a pipe or hose that appeared to have some condensation. I turned the car back on and watched again, the sound happened again and the car started to sputter. The AC was on and I turned it off, the car continued to sputter although I did not leave it on after turning the AC off for very long in case there was a problem.

My car is a 2006 Honda Civic My car has 150000 miles.
My car has an automatic transmission.

Let me address your mention of the A/C first because of the possibility of a refrigerant leak. Such leaks do create "steam clouds" like that you are describing but the leaks end VERY quickly because the refrigerant boils off violently as it hits the atmosphere. At any rate, IF the A/C system continued to blow cold air during this incident, that would mean that the A/C system is NOT the source of the leak.

If the A/C system did not develop a sudden leak, the likely explanation for the steam cloud is a cooling system leak. Such a leak can be addressed during a mobile visit from YourMechanic. You report an additional issue, though, which is the no-start condition. YourMechanic can diagnoses and repair that as well. Your no start condition could be due to a simple problem such as an old dead battery in need of replacement. If you want to do some initial work of your own, on the no start problem, just fully charge the battery, and once fully charged perform a load test on the battery to see if it is any good. Please let us know how we can assist you further on these two problems that you are having with your car.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. There is a blow off valve type sound coming from the engine and then steam coming out.

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: Engine is possibly ceased up.

Hi there. If you are able to crank the engine over and the engine does turn over, then the engine is not seized up. However, if the engine hesitates as its turning over, then the timing belt may have either...

Q: Oil leak and loss of speed

Hello. There are a couple of reasons why your car would be losing speed and leaking oil. There may be a hole in the oil pan and/or an engine block. I would recommend having a certified technician, such as one...

Q: Can you give me advice on what you think the problem might be.

Hello. From what you described, it would appear that the vehicle may possibly be experiencing some sort of mechanical or performance issues. If there was a thud and the vehicle will no longer crank, then it may be possible that...

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...
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...
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.