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"Clank" Noise During Evacuation - Denso Compressor

Matt L on Sat July 25, 2009 10:21 PM User is offline

Year: 1996
Make: Mercedes-Benz
Model: Denso 7SB16C
Engine Size: L6-3L
Refrigerant Type: 134a

When I evacuate the refrigerant from my car, I get about two-thirds of the refrigerant out and the pressure starts to drop quickly. Once the pressure gets to about 20InHg vacuum, there is a very loud "clack" noise from deep in the bowels of the car, perhaps the compressor but I am not sure. When that "clack" occurs, the pressure very quickly rises to about 10 PSIG, so clearly some trapped refrigerant is being released. After that "clack", more refrigerant is extracted to the tank. This is a 7SB16C Denso compressor, if memory serves correctly.

Is this normal, or a sign of a problem with my compressor or the rest of the system? I hope that it's normal, because with the proper refrigerant fill, the system works great.

Chick on Sun July 26, 2009 5:58 AM User is offlineView users profile

I hear it more on cars with accumulators, ,ore like a pop... it's the refrigerant being released from the oil in the system.. Your car runs cold, leave it alone...

Email: Chick


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