Q: Air conditioning blockage pressure - 1988 Mercedes-Benz 300TE

asked by on

My air conditioning isn’t working right. Its summer now, so I need to get it fixed. I think there might be some kind of blockage in my AC but not sure where. I cleared out the system and vacuumed it down to ~29hg. There's only 12 ounces of refrigerant in it, and I’m getting 45/320 psi lo/hi. That’s only a third of the recommended capacity for r134a refrigerant and 28 ounces is recommended. So why is the pressure so high after 1 can? I think it’s a blockage but not sure. Could something else be causing this? I’m clearing the lines of air before I start. The vacuum held fine for 30 minutes after I shut off the valves. Do you have any idea what might be wrong and how I can fix this?

Hey there. The condenser is blocked or the expansion valve is stuck causing the problem. Make sure when testing you have proper air flow across the condenser. If the fan clutch is not working good then the pressures will be too high. Check the fan clutch if it is at full flow. If you would like to have this checked, a qualified pro from YourMechanic can come to your car’s location to inspect the air conditioning and proceed with the proper repair.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Air conditioning blockage pressure - 1988 Mercedes-Benz 300TE

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 won't go forward and is leaking - 1992 Mercedes Benz 300TE

Hey there. If the line is broken, then it has to be replaced. The line is a special transmission cooler line. You may need to use dealer supplied parts for this repair only. The transmission should not be tried to...

Q: Fuse A/C power windows

Hello, thanks for writing in about your 2005 Kia Spectra5. It sounds like those systems may all share that same fuse and one of them is drawing too many amps, or there is a short in the circuit. I wonder...

Q: replaced serpentine belt now no ac

If the a/c was working before you changed the belt and not it does not work and the belt squeaks then you may have put the belt on incorrect and it is blocking the a/c clutch from engaging. Check each...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.