Skip the auto shop - Our mechanics make house calls

Q: Ac not cooling properly.

asked by on

Had a new ac compressor and drier installed last week. The old compressor would make a lot of noise when turning on the ac and it was not cooling much at all. After having it installed by a local mechanic along with the a new drier I noticed the ac only cools when turning on the recirculation button on. I took an ac thermometer to check the temperature on the center vent and it would go as low as 48F with recirculation on. With the recirculation button off the lowest temperature is 64F. And the air feels dry and warm for 64F. It takes 20 minutes for the ac to cool with the recirculation button on to 48F. I also noticed the gas mileage dropped from 16.7 to 16.2 mpg after having the compressor installed. The mechanic who installed the compressor and drier said everything is fine. What could be the issue for not cooling without the recirculation and for it to take a long time to cool well with recirculation?

A: Hello. Thanks for writing in about your 200...

Hello. Thanks for writing in about your 2005 Toyota 4Runner. You could try purchasing another thermometer to check the level, but the system’s instruments don’t typically give false readings. The conditions outside can affect the operation of the system as well. The recirculation option takes air from inside the vehicle and pushes it through the air conditioning system a second time, and this process will generally provide a bit of extra cooling.

One option can be to have the system evacuated of refrigerant and held under a vacuum for a couple of hours to boil out any moisture, as water will begin to boil once you remove atmospheric pressure.

After this time, the system can be refilled and new oil added. If your vehicle has a cabin air filter, try checking to see if it’s dirty and blocking air flow to the AC system in-cabin fan. If you want to have a professional diagnose the AC system before making any adjustments or repairs, a certified technician from YourMechanic can come to your home or office to perform this service.

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

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: oil leak at the all wheel drive transfer case

Rebuilding a transfer case for your Toyota Sienna is a pretty lengthy process, especially if it has not been done previously. The labor time it takes to remove and install everything for the transfer case is around twelve and a...

Q: Bad AC condenser or compressor

Hello. Firstly, I would recommend checking the refrigerant levels. Low refrigerant causes similar symptoms of a bad compressor or condenser. Our company provides on site vehicle inspection by ASE certified technicians who will check the refrigerant pressures, and if necessary,...

Q: Car wont go above 4k rpm when my foot is down but goes above 4k when i release it a bit

Hello. Most of the time when this occurs it is due to a few things. I usually start by checking the exhaust. Most of the time this is caused by a restriction in the exhaust caused by a failing catalytic...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...