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07-18-2007, 12:36 PM
I have a 1997 C280. The air conditioning whistles (an up and down whistle). It doesn't matter which fan speed I have it set to. It's a very distracting and annoying sound. I recently replaced the cabin filter about a month ago, but this noise just started. I took out the cabin filter and put it back in, but this had no effect. Could the unit be low on freon? What should the pressure read on the low side?

Any help is GREATLY appreciated.

Paddy jr.
08-23-2007, 07:33 AM
You can check the freon level by a glass spy over the freon filter.
Turn on the clima and check the countinous flow of liquid freon whitout gas. If you look gas then you have to refeel.

04-07-2009, 08:53 AM
My 1995 C280 just developed the same problem. The whistle is intermittent and almost sounds like a cat crying.

04-07-2009, 08:55 AM
I just noticed that this post is 2 years old. Did Photog3740 ever determine what was causing the problem. Thanks.

06-24-2009, 09:18 AM
My AC is leaking and I want to know where is the most common place of leaking for a 1996 C280?

09-11-2009, 09:38 AM
I have a 1998 C230 and I sometimes hear what sounds like a dreadful cat mating call. Dealer said that I have a vacuum leak and one of the six actuators (possibly the Fresh Air) is the cause. The labor to remove dash is $1000, the labor to replace part is $295.00 Does anyone have any less expensive solutions other than buying a louder radio?

11-03-2009, 10:20 AM
my air blower run only on 2 speeds for the avalable 5.

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