what would be making a noise in the engine compartment that would kill my battery in 8 hrs?

1995 AUDI 90
228,000 MILES
Avatar
LILJEWEL44
  • MEMBER
  • 1 POST
I am hearing a noise in the engine compartment of the car. everything appears to be off on the inside of the car. in 8 hours the battery will be dead.
Dec 1, 2011 at 5:39 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
A bad alt could make noise. Also, does this happen when the engine is off or running? If off, check for electrical draw. Our homepage under the DIY section has directions. Also, check alt output to make sure it is producing. If it is and there is no power to the battery from the alt, check the fuseable link between the alt and battery.
Dec 1, 2011 at 7:26 PM
Avatar
EXOVCDS
  • ✓Experienced Mechanic
  • 1,882 POSTS
Audi & VW like to use auxiliary electric water pumps that
circulate coolant after the engine is shut off. This prevents
hot spots from forming... protecting the cylinder head, heater
core & radiator.

So it could be that.

There's a temperature sensor & relay that controls this operation.

Thomas
Mar 14, 2012 at 8:01 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle