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 1,000 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!
  1. Home
  2. Questions
  3. The AC in my truck isn't working - 2005 Ford F-150

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: Car makes a smooth spinning sound when I turn the key over. Does not start. Starter bench tested green.

Bench testing a starter is not necessarily reliable because the starter is not actually tested under any load. The starter is just simply free-wheeling and that is not hard to achieve if the electric motor within works even marginally. If...

Q: what would cause no reading on coolant and ac to stop working

Hi there. From the description you have provided, your vehicle's coolant temperature displaying ---- and a/c stops working, are most likely related. It could be, a faulty coolant temperature sensor intermittently going open. It could be, a poor electrical connection...

Q: What do I do if the engine temperature gets too hot?

The engine temperature of your truck is important to keep an eye on. It is critical to safe vehicle operation and it is important to take the correct steps if overheating occurs. When the engine temperature gets too hot. ...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...