Q: Air conditioning pressure doesn't change when clutch is engaged.

asked by on

Recently had an AC Line (High Side) blow, assumed it was just an old line. Replaced the line, the drier and did an full evac and started to put fluid back in with a gauge set. Once the clutched engaged the pressures didn't change at all, so I figured the compressor had to be bad. Replaced the compressor (reman) and did another evac and started to put fluid in again and once again, once the clutch engaged the pressures don't change at all. So is it just another compressor that is faulty? Can't really think of what else it would be, I would think even if it was the expansion valve that faulted that pressures would still change. Any help would be much appreciated! :)

P.S. I've done my own AC a few times already and done AC on other vehicles before without problem.

If your expansion valve was stuck in the open position then you may not see much, if any, change in pressures. Before replacing the expansion valve I would recommend you remove the compressor inlet line and turn the compressor by hand to see if you feel it sucking in the line you disconnected. If you do not feel any suction then you have a compressor that is bad. If you feel a good suction then replace the expansion valve, evacuate, and recharge. Then retest system to see if it works normal. To avoid any unnecessary repairs, consider YourMechanic, as one of our mobile technicians can come to your home or office to diagnose the issue with your A/C and help you fix it accordingly.

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. Air conditioning pressure doesn't change when clutch is engaged.

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: transmission input shaft

Hello, when you removed the pump you may have relocated clutch plates in the input housing. These plates must align with a hub assembly. What happens is that the pump puts pressure on the housing because there is no end...

Q: There is a hole directly below the heater core hoses on the firewall of the engine compartment that is dripping coolant

This is the A/C heater evaporator case drain. If you see coolant leaking from it then you have a blown out heater core inside the evaporator case. If you do not get it fixed soon the engine will run out...

Q: My car won’t start. The dash lights don’t turn on when I turn the key. There is a new battery in it. Start when jumped.

It sounds like the ground wire itself could be faulty. I would recommend replacing the ground wire itself and this should re gain power in your electrical system.

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.