Skip the auto shop - Our mechanics make house calls

Q: My A/C only blows cold on recirculate

asked by on

My evaporator tube clogged flooding the passenger side, I unclogging it I noticed the A/C only blows cold when on recirculate but luke warm on normal or outside air. A/C Refrigerant is fine.

My car has 75000 miles.
My car has an automatic transmission.

A: Hello. You will always get colder air when ...

Hello. You will always get colder air when on recirculate. When taking in the outside air the A/C system will be able to drop the temperature coming in by about 20 to 30 degrees. This means if the outside air is 95 degrees, then the coldest you will get coming out of your vents is about 65 degrees (Fahrenheit).

When on recirculate you keep using the air inside the cab and will still lower the inlet temperature by 20 to 30 degrees, but you will get a lower drop as the system runs since the inlet air may get to 65 degrees and your vent temperature can get down to about 40 degrees.

If you are low on refrigerant even by a little, you will not get the full temperature drop and may only get a 15 or 20 degree drop or less. Have the system pressures checked with a gauge set to see if the system needs a little refrigerant. If you would like to have this checked, a qualified technician from YourMechanic can come to your car’s location to inspect the AC system for you.

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: Side mirrors not moving

If your side rearview mirrors are not working but you can hear the motor moving, then they may have come loose, or are either broken from the backing plates. I would recommend having a professional technician, such as one from...

Q: How do I tell if my refrigeration system is faulty?

The refrigerant leak will in most cases not leave any evidence of where it leaked from. There are many possibilities in the system to leak. The evaporator in the dash is one of the major area that will leak and...

Q: My sunroof doesn't work at all and my ac is blowing hot air

The sunroof and the air conditioning system are two separate systems and are not connected to the same fuse. While a blown fuse for either system is possible, any number of faults can be causing each system to stop working....

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...
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...