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.

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: I took the engine out of a 2007 malibu and put it into a 2005 cobolt and now it won't start.

Hi there. Check all of the sensors to the engine and make sure that all of them are connected. Check the computer and see if there is an wires disconnected to it. A loose wire or a sensor to the...

Q: Hear engine grinding noise at idle only-park or drive. Then goes away above idle. Not AC or any pumps. What is it?

Hi there. In many cases, the grinding noise coming from an engine at idle and in park can be caused by a VVT solenoid or switch. Typically solenoid problems are caused by dirty oil, which clogs the screen that sits...

Q: Pcm

Hello, thanks for writing in about your Ford F-150. I'm curious if you got the new PCM from the dealer. You should check if have the exact same part number on it. If the part numbers do not match and...

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...