Skip the auto shop - Our mechanics make house calls

Q: When a/c was on, steam from under hood and a/c went warm on a hot day and on another day came out cool for a several minutes

asked by on

When a/c was on, steam from under hood and a/c went warm on a hot day and on another day came out cool for a several minutes, then went warm again

My car has 108000 miles.
My car has an automatic transmission.

A: The source of the steam should be the first...

The source of the steam should be the first thing repaired. It is highly probable that once the leak is repaired, the A/C system will begin to work again. There are two fluid sources under the hood that can create steam. They would be coolant and A/C refrigerant. The description you have given suggests the refrigerant is low in the A/C system and this is also consistent with the steam from under the hood. In addition, if you had a coolant leak, your car would most likely be overheating and the leak would be getting worse the more you drive it. It’s is very rare for a cooling system to leak and then stop. The A/C system however under goes a series of pressure changes as it begins to produce cold air that could easily create a leak and then turn off as a result of the sudden pressure drop.

I recommend the following inspection to help you out; AC is not working inspection, to get your air conditioning system back working again.

Good luck!

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: Does it helps to run A/C or Compressor (by moving the knob to blue) during winter.

You can try to run it a couple time a month just to circulate the oil through the system. Yet, in most cases the a/c compressor may not come on if the temperature is too cold. You should use the...

Q: Yeah I have a 2001 Seville SLS I've been told it needs a water pump thermostat and upper hose what would that cost

Hi Jon. Did you notice any coolant leaking from the vehicle? Any smells, steam, or any evidence of coolant? There may be a water pump concern and the other items being recommended as preventive maintenance. However, without a proper cooling...

Q: CHECK ENGINE LIGHT ON

Hi there: If you replaced the cam sensors and the check engine light is still illuminated, it's highly possible that the trouble code is caused by the electrical harness attached to the sensors as opposed to the sensors themselves. The...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...