Skip the auto shop - Our mechanics make house calls

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.

A: If your expansion valve was stuck in the op...

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 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: What happens if i replace the catalytic with a thrush muffler and put a DC sports exhaust about 2 feet away from the thrush.

Removal of the catalytic converter on a car that will be operated on the street is very illegal, and can get you a huge fine from the EPA. Also, since most modern vehicles are designed to run with some system...

Q: No air coming from any vents in vehicle.

Hello. I would guess your issue is the blower motor. Your blower motor is what sends or pushes air through your vents into the cabin of your vehicle. These are most commonly located under or behind your glove box. Use...

Q: my question is that i want to get a nissan sliva s14 which is the 240sx i guess but when i get it i want to convert it into a gtr

Hello. I have seen several s14/240sx's with the RB26 motor installed in them. I do not believe that it is a direct swap however. There is most likely some fabrication involved. If you search around on the internet i'm sure...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.