Q: Evaporator issues maybe or expansion valve

asked by on

My car ac was just working earlier but as soon as i turn my car back on my car started blowing hot air and im hearing a weird hissing coming from my glove box did my evaporator just break and or is it my ac expanision valve

My car has 265 miles.
My car has an automatic transmission.

It is normal for there to be a hissing noise from the A/C as the pressure equalizes out between the high pressure side and the low pressure side of the system. So no need to jump to conclusions about failed evaporators yet, it could be a number of less expensive issues. The first thing that should be done is to check and see if the compressor turns on when you press the A/C button. Then you need to hook up a set of pressure gauges to your A/C system. This will tell us the operating pressure, and tell us if the system is working properly or not. From there, any issues with the A/C can be determined and diagnosed. I would suggest having a qualified professional, such as one from YourMechanic, check your A/C system for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Evaporator issues maybe or expansion valve

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: Passenger side coolant leak

Thanks for writing in about your Ford Taurus. You need to have the cooling system pressure tested to see where it is leaking. From what you've described the water pump may be leaking. The heater core is a suspect as...

Q: My 1997 BMW 328i is leaking hydraulic fluid from where the bellhousing unit bolts to the transmission?

The hydraulic fluid is probably from the hydraulic clutch lines, the clutch cylinder and/or fittings. To get the source of the leak pinpointed and repaired, a clutch system inspection/diagnostic is recommended. If you request that service, the responding certified mechanic...

Q: Car ran great and shifted great until had to slow down to turn. Then was like it was in 1st gear and felt like the engine brake on

There is no engine brake. Deceleration on the vehicle is effected only through application of the service brakes and there is some resistance through the drive train as well but there is no specific engine "brake". Of course, try the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...