Thread: AC whistle
View Single Post
Old 01-31-2001, 07:22 PM
JCE's Avatar
JCE JCE is offline
Down to the Wear Bars
Join Date: May 1999
Location: So Kalifornia
Posts: 2,189
After a freon leak got worse, I had the expansion valve and evaporator/dryer replaced, along with the "O" ring on the low pressure line at the firewall. The system was evacuated and converted to 134a at that time. The AC seems to work great, but since the conversion my blower makes a whistle. The pitch and volume of the whistle noise is dependent on the blower speed, and on whether or not the sun roof or window is cracked open. This occurs when the AC is in the normal settings of Auto fan speed, center button selected (Black arrow up, white arrow down) and fresh air switch set to fresh. If I switch to the dehumidify position (white arrows up and down), or switch to recirculate, the noise goes away. If I switch the fan to max, the noise gets worse. Any ideas about cause of the noise? Thanks for any help.

[Edited by JCE on 01-31-2001 at 07:26 PM]

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E
Reply With Quote