99 chevy silverado going through antifreeze?

[bushdoggs]

my silverado is going through antifreeze. no signs of any leaks , and its not in the oil. truck does not over heat . adding about a gallon and a half a month. where might i start , or where could the coolant be going.

 

[coolkat]

I have the same truck and have never had a problem like this.....i wish if i had some answers for u but i dont.

 

[mikey]

A gallon and a half a month is not very much. I sold a chevy powered buick to a lady once who began complaining that it was loosing a cup of coolant every day. I of course thought she was crazy but after a couple of months of this I told her to bring the car to my garage. I raised the hood and saw nothing. Removed the air cleaner and saw a dead kitten, hard as a rock. When I removed it and then tried to clean up around the carb(a little hair is all) I felt something on my arm. The car had a pin hole leak in the heater hose spraying on the choke pull off and immediately evaporating. As the car cooled the pressure dropped and so did the leak. It was such a fine stream of water that it could not be seen even when you knew where it was coming from unless you got the light just right. I'm not saying you have a dead cat, I'm saying the other guys are right. The water is going somewhere - keep looking.

 

[John C]

if its a vortec motor, they have a very common problem of leaking coolant through the intake gaskets. look into it. good call on the heater core, just remember, it HAS to be going somewheres.