Skip the auto shop - Our mechanics make house calls

Q: Air conditioning blowing hot. 2006 Scion tC

asked by on

My air conditioning has been blowing hot for a few weeks now. It seems like the ac clutch is not engaging. What can I check to find out how to fix this problem?

My car has 140000 miles.
My car has an automatic transmission.

If your A/C compressor clutch isn’t engaging, the most common cause is low refrigerant in the system. The only way to check this is to connect an expensive machine to your car, remove the refrigerant and weigh it. Doing other electrical tests (which would be what follows if the system is full) would be in vain when it could simply be a low refrigerant. We can force the system on, but doing this will require gauges to read the high and low pressures. This can reveal a low system, but connecting gauges is the first step in recovering refrigerant and weighing it. Not to mention servicing your A/C in this way is like changing your oil.

I would recommend checking all of your fuses. Yes, all of them. Many fuses will power other fuses. So even if you check only the fuses marked A/C, there could still be a fuse blown that powers that one. So check them all with a test light.

If you need to have this all scoped out for you, a certified professional from YourMechanic can diagnose the AC system at your home or office and follow through with any needed repairs.

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: Cooling Fans

Most Vehicles now have 2 separate cooling fans. One cooling fan is intended to come on when the engine reaches a certain temperature. The other cooling fan is intended to come on when the air conditioning is turned on. When...

Q: Coolant leak??

My suggestion is to have the coolant refilled and the system pressure tested to see whether you have a leak, or the engine overheated due to a fan not turning on, or you have a blown head gasket. A...

Q: Replaced clutch, transmission will not tighten against engine, need advice.

You should replace the pilot bearing anytime the clutch is replaced. You should have aligned the clutch to the pilot bearing with an alignment tool. When aligning the clutch disc you need to make sure it is centered perfectly as...

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...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...