What's causing the hissing noise coming from my air conditioner?


Asked by Nov 03, 2008 at 01:08 PM about the 1989 Mercury Grand Marquis

Question type: Maintenance & Repair

As soon as I shift the car into drive, a hissing noise comes from the driver's side air conditioner.  I have noticed that the volume of the noise is directly proportional to how much pressure I put on the gas pedal.  Do you know (a) what is causing this problem and (b) approximately how much it will cost to get it fixed?

2 Answers


Are you sure it has anything to do with the Air Conditioner? I have an '85 Crown Victoria, and I Have a hissing that comes from my steering column, the amount changes by where I position the gear selector. It's likely a vaccum leak somewhere in the system. I haevn't gotten it looked at however, so I don't know the cause or the fix. Try taking it to a mechanic, they should give you a quote for free...

3 people found this helpful.

I have the same issue.It comes from a white plastic part that is located low on the steering column. It is probably warped from age and you hear the vacuum leak.I have not fixed it yet.

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