I request information

Hello to the Forum
Good morning
I have the next problem in my truck I have a Luv Checvrolet Spacecap truck year 1997 of 2300 cc, it has a mileage of 385000 km, everything usually passed when one day I walk the truck I started to zonar a whistle like the sound of some vehicles when they are in back A person who is not macanic but has learned by practicing, I disconnect the sound which is a relex, the truck works the rather and does not turn on any light on the warning board.
Who can help me with this problem

The safest thing is that it is the sound that warns that you use the seat belt, maybe the relay stuck so does not stop ringing, I don't think you have any problem with the engine I hope my response serves you something lucky.

I have a Luv 97 and it makes me that noise that you describe when it takes refrigerant.

It is actually elfarin that whistle indicates a water coolant level, I turned crazy vuscanding where the happy noise came in the workshop and it was that, just fill it, connect the relay again and you will surely walk that it will no longer sound.