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1993 Ford Thunderbird Making Noise - Heating & Cooling System
Question: I have a 1993 Thunderbird LX. I hear a hissing noise from the heating and cooling head unit. I've remove the head unit, sprayed carb cleaner behind it to see if it was a vacuum leak. Found nothing. When I accelerate the noise seems to dissapear. So I figured it was in the vac. pak. Went to the junk yard and got a new head unit. Installed it, and still same problem. We hooked it up to a computer to read the info from the car computer. It said that My EGR Vacuum regulater was opperating @ 0%. and the O2 sensers were both reading rich. I was wondering how to stop the headunit from "leaking" because I was assuming the car was running rich because the EGR wasn't opening/closing because of a possible vacuum leak in headunit (heating/cooling) I'm kind of stuck on this and have been chasing my tail for about a year. Also the car has a bit of a rough idle and occasonally has a vibration/tapping noise. Thanks - Tim
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