Skip the auto shop - Our mechanics make house calls

Q: Hot air from the AC

asked by on

The AC is blowing out hot air. It could be the expansion valve, but I am not sure.

A: Having a broken A/C is very unfortunate, no...

Having a broken A/C is very unfortunate, not to mention uncomfortable. There can be several reasons why your Mercury’s Air Conditioning is blowing out hot air and you are correct to believe that the expansion valve could be one of them. However, it is also just as likely that the A/C system is low on refrigerant. To determine if the expansion valve is indeed the problem, I highly recommend enlisting the assistance of a certified mechanic to stop by and look over your vehicle. They will be able to diagnose the A/C system in your Mercury Montego in person and determine exactly why it is not blowing cold. They will also be able to assist you in making the necessary repairs to keep you and your passengers cool on those hot days.

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: Gauges going crazy

This may be related to a short, a faulty instrument cluster or a faulty instrument voltage regulator. The instrument voltage regulator regulates the voltage supplied to the various gauges in your vehicle’s dash. When this is not working properly, this...

Q: My AC compressor locked up and my steering wheel belt snapped and my car begin to overheat. What is the cause?

Either the air conditioning compressor or clutch has failed. Most of the time the clutch fails and locks to the compressor housing causing the compressor to not turn. If the air conditioning was off when the belt seized, then the...

Q: How many gallons of fuel does it take to crank my truck after running out of gas?

You need to have someone cycle the key on and off and on again while you open gas cap and listen to see if the fuel pump is turning on. You may have burned out the fuel pump and it...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...