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#1
07-24-2003, 08:38 AM
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Whistling from engine at shutdown
In my 82 300D turbo diesel every time I shut off the engine lately I get a high pitched whistling from the front of the engine compartment. I know I have some vacuum leaks in the central locking and HVAC control unit but when I started looking for them I found that my vacuum pump is functioning properly and holding a vacuum. That was my first thought that the diaphram in the pump had a hole in it.
Could this be something in the AC system since I've only noticed it since I've started using it. I don't have any performance or MPG problems with the car and the AC is blowing cold(only out of the side and defrost vents). My wife is worrying herself to death that this car is going to leave me beside the road someday but I still have faith in it. Last edited by jake1222; 07-24-2003 at 09:20 AM. 
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#2
07-24-2003, 10:12 AM
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i'm going to take a stab at this. could the noise be possibly coming from a worn turbo, winding down after shutdown? suggest have someone shut the car down while you listen closely to the area of the turbo, in order to try to localize the noise.
__________________
1984 300D Turbo - 231k....totalled 11/30/07 RIP
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#3
07-24-2003, 01:00 PM
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I've listened in that area but it sounds as if it is coming from the front of the engine (around the vac pump). This is why I am assuming the vac pump is defective but it still holds a vacuum. I was just wondering if anybody else may have heard something like this in thier's. It also takes a few seconds after the engine is off before it starts to whistle (kinda like someone holding a ballon and letting air escape while stretching the inlet).
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#4
07-24-2003, 05:01 PM
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Sounds like the freon equalizing in the A/C after shutdown.
__________________
1971 R600 Mack toterhome (SuperDawg)  99 NU-WA Snowbird 34+2 SE 102 5er  If it's not diesel, it's not in my stable! 53 F100 617.951/auto  95 Dodge 3500 Cummins/5 speed service truck
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#5
07-24-2003, 07:18 PM
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Could also be a bad check valve leaking all the vac out of the AC or door reservoir, too -- sounds just like a ballon venting out a stretched mouth.
The check valve on the vac pump could be going bad, too, same result. Peter
__________________
1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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