Help.. really loud buzzer!

[viper4490]

I have a 76 911. I was driving it yesterday and all of a sudden this really loud buzzer goes on. At first I thought it was the horn and that somehow the wires were touching but it wasnt the horn.. They sounded different. But the buzzer was on for awhile like 3-4 min...Anybody know what it is?

[tcar]

From front of car? Reference to horn sounds like it.

First thought is fuel pump is heading South.

Also I've heard similar when my front fresh air ventilation fan (w/ crummy bearings) behind dash, came on by itself when I hit a bump.

Only other things up there are, if you have A/C, the evaporator blower in the smuggler's box or the condenser fan by the battery.

[rusnak]

if your car has a factory alarm, it could be the alarm horn going off

[MBAtarga]

Could it be the seat belt warning relay?

[lfot]

Originally Posted by MBAtarga

Could it be the seat belt warning relay?

That's what I was thinking. Need a little more info though. Pull the Temp/Druck or RPM gauge out. If the sound gets louder, it's probably the belt warning relay. Carefully feel around in there for a boxy relay that might be shaking/buzzing. If it is, pull it out. You might have a bad relay or a bad connection making it go off.

[MT930]

Check the front air con condenser blower motor, when it starts going out (bearings) it sounds just like a buzzer very loud.Only happens when the air con is on. It had me looking all over. Easy fix