Q: AC only blows hot air

asked by on

My AC is only blowing hot air. I was told that the Constant Control Relay Module needs to be replaced.

A: Hello. We will be happy to assist! To diagn...

Hello. We will be happy to assist! To diagnose an AC concern, I first suggest checking the freon levels as it is the most vital component to the health of the AC system. Then, a technician should attempt directly switching on components from the Constant Control Relay Module controls, such as the cooling fan and AC compressor. If the components work fine when directly powered, then there may be an issue with the circuit of the AC system, or the Constant Control Relay Module may need to be replaced; the sensors in them are known to fail on your particular vehicle. Please keep in mind that the Federal Government mandates that all AC repairs be performed by an EPA-certified technician. A great way to find such technicians in your area is through "YourMechanic". They can send an EPA-certified technician to your Mustang's location to inspect your AC system, and recommend the best path to repair.

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: Interior panels peeling off on doors

This upholstery issue affected Mustangs from 2005 to 2009 and it really does make the interior look terrible and cheap. Ford keeps on saying they are not aware of this being a widespread issue but they have repaired this...

Q: Computer showing codes for things not broken

When a car's Check Engine Light comes on it is telling us there is a fault in a system and a code is displayed. When this code is displayed, it tells us where to start looking for a fault, but...

Q: Car hesitates, stalls at idle, P0102 code

Hello. This can be caused by a number of things. I usually install a scan tool first to see what the sensors are reading. Most of the time this is caused by a leaking intake manifold gasket. This is a...

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.