Recently it has begun to sound like I have a flock of birds chirping under my dash when I turn the heater on. This is not fan related as it occurs at all fan speeds but does not change pitch.

Could this be a vacuum leak..or is it "normal" for a 1987 201?

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Dana Linscott
Vegoil converted truck...vegoil converted 1987 190DT, 300 series next.

http://vegoilconversions.netfirms.com/