Skip the auto shop - Our mechanics make house calls

Q: A/C blows only hot air

asked by on

My minivan’s A/C only blows hot air. I added freon, but the clutch never engaged. Then I pulled the connector from the pressure switch and shorted it. I started the car and the A/C, but the clutch would not engage. Then I checked the relay and also the fuses. Both of those were good. The low side revealed 100psi on the car gauge. What is your diagnosis and what will solve this? Thanks.

A: I would suggest checking power and ground f...

I would suggest checking power and ground for the A/C compression clutch. The power is fed through the wire connector to the clutch, and it's grounded though the body of the compressor to the engine block. If there is power and ground, then the compressor clutch has failed. If there is no power there, then you will need to follow the wiring diagram back up from the compressor, checking at multiple spots along the way. Without the compressor clutch running, the pressures on the high and low side will read the same. They only become different once the compressor is running. If you need help having this checked, a certified technician from YourMechanic will be able to come to your home or office to diagnose your A/C system and assist you with any 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・Save up to 30%

Get a quote

What others are asking

Q: The engine is off, radiator fan still works, AC issues

Since the wiring system has been modified and the fan wired hot at all times with the key on. I recommend having a mechanic diagnose the real problem with the wiring since it may be an issue with the internals...

Q: Oil leak and shaking

The oil filter, filter housing, and the oil pressure switch is on the left or drivers side of the motor. The shaking can be from a problem with the camshaft's tensioner and guides. If the oil leak is on the...

Q: Loud squeal when clutch is depressed.

Hello. A squealing clutch can be caused by a few different things, depending on where the noise appears to be coming from. If the clutch is squealing when you depress the pedal then it may be possible that the clutch...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.