Date: Mon, 28 Jun 1999 17:46:24 +0200
From: "Anders Johansson" <>
Subject: Re: Noise in AC and Front suspention

> I have a 97 900SE Turbo. Im going in for my last visit to the >dealer before the 50K Warrantee is over. But I have two annoying issues >with the car. >2) When the Air conditioning turns on and off, there is a clunk and a >strain on the Engine, Seems a little too loud to be normal. I just got >the car 15K ago, not sure if this is typical of such an expensive car. >The first two times I bought it in they never heard the sound. The >third time they found gas in the vacuums canister. Said I must have >filled the car while running it???? They thought that they had fixed >it..... Nope. could anyone please help with either of these issues. >Email would be great. But I do try to read this news group often. > >thanks >scot >'97 900SE Turbo. Scot, concerning the noise when the air-conditioning turns on and off. When the magnetic cluth is engaged it is normal with a clicking noise. If the noise is getting louder and louder I would guess that something is wrong. A good way of repeating the noise is to be parked in some +20 C ambient and pressing the 'econ' button several times. Econ means no AC (copressor off). When the AC is engaged the load on the motor increases dramaticlly and the engine management system will rise the engine rpm (a very good engine management system would do this compensation unnoticable). The reason for this on and off is that the system pressure (or the evaporator temperature) is to high (low) and the built in pressure (temperature) sensors will make the compressor to disengage until pressure/temperature is back to the lower level. The 9-5 has a more sophisticated compressor with a variable displacement, hence no cluth needed! Regards Anders

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