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.

A: If your A/C compressor clutch isn’t engagin...

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: Air conditioner not working

Hello. Since R12 and R134 have been mixed into the refrigerant system, there is a good chance that the mix of the two types of refrigerant could have caused damage. They use different kinds of oil, and can cause coagulation...

Q: Car not accelerating when first started

Hi there. When you let your car sit for a long period of time the gasoline tends to lose its combustibility. Along with sediment settling in your tank this will cause your vehicle to not perform properly. Also a malfunction...

Q: headlight/ tail light tinting laws in Utah

Have lived in St George for six years, I understand the frustration you're experiencing with the legality of your tint. The truth is that the State of Utah frequently changes automotive safety standards; in most cases, on an annual basis....

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...