Skip the auto shop - Our mechanics make house calls

Q: The AC in my truck isn't working - 2005 Ford F-150

asked by on

My pressures on my manifold gages are reading 0 psi on low side and 200 psi on high side. Supply temp is around 77 degrees. I figure I have a restriction but I wanted to make sure if there is an expansion valve that monitors refrigereant.

My car has 74000 miles.
My car has an automatic transmission.

A: Your a/c should of cycled out at 24 psi on ...

Your a/c should of cycled out at 24 psi on the low side and you should not let it get to zero. The a/c cycling switch will need to be replaced first then the system rechecked. You will find the system is low on refrigerant from a leak most likely from the compressor front seal. Have the cycling switch replaced and system topped off with refrigerant. Then leak check after the system is operating normally.

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: Intermittent issue with the brakes slipping

The problem may be due to the ABS engaging and seeming like the brakes are releasing in the front. If you have a defective wheel sensor in the front, then this can cause this. The wheel that has a bad...

Q: Rattling from AC when idling

The rattling may be from the AC compressor pulley or tensioner for the belt. The tensioner is the most common problem, but the spring may be too weak causing vibrations and rattles. I recommend seeking a mechanic, such as one...

Q: Can I put E85 in my gas tank?

If the previous owner specifically asked you not to, they may have known about an issues the vehicle has when using E85. It may be necessary to visit your local dealer to take a look at the truck to see...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...