when i start the car in the morning engine makes a screaching sound for about 40 seconds.this happens every time when engine is cold.Car drives fine.What is causing this sound at start up
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2002 Cadillac DeVille Question: had engine gasket replaced.works fine no leeks .
Answer #1cardocIII from Gillespie's Auto Service, November 26, 2013, 02:33Master
Check the belt and tensioner. With noises nothing replaces hearing it ourselves as part of the process of determining the cause. Worst case you might need to drop this off so a shop can reproduce the conditions that cause the noise to occur.
JPHorst November 26, 2013, 04:45Enthusiast
Replace your Serpentine belt would be my guess
Answer #3Greg's Orange Auto (13030 Answers) , Orange, CA - (714) 361-9386globalhelper November 26, 2013, 06:26Master
sounds like belt or tension issues
Replytjmalik, November 26, 2013, 07:15Rookie
had it at gm shop.All belts and pullies are OK.They said it is definitely vacuum,but is not a gasket.they did not have enough time to diagnose completely,but mechanic thought it may be a sensor.if it is a sensor can anyone tell me where it is located.
Answer #4Hummertech November 28, 2013, 07:01Enthusiast
Could be your air pump, but that typically sounds like a buzzing or wheezing noise. I suggest it because the air pump runs for a short time on cold startup.
Replytjmalik, December 04, 2013, 08:22Rookie
IT DOES SOUND LIKE YO SAID BUT ONLY FOR ABOUT 39 SECONDS, IF IT IS THE AIR PUMP WOULD IT DO THAT ?WHAT S
DOES THE AIR PUMP DO
THANKS FOR YOUR HELP
ReplyHummertech, December 04, 2013, 10:31Enthusiast
I have had the air pump make that noise on several vehicles. The air pump supplies filtered air through the secondary air injection system into the exhaust system. This helps reduce emissions. So it's really only on during a cold start. It's located lower left of the engine. Easily accessible from underneath once the lower air deflector is removed or left front fender liner is removed.