I have a 1995 gmc safari half ton van its a 4.3 liter it has to have water put in it constantly after 40 miles we put 2 gallons in it the water runs out the tailpipe what should I do it has 377,606 miles on it we use it for r delivery service
SOUNDS LIKE HEAD GASKETS TO ME. CHECK FOR WATER IN YOUR OIL AND ALSO OIL RESIDUE IN YOUR RADIATOR. HAVE YOUR COMPRESSION TESTED THAT WILL TELL YOU FOR SURE. I PERSONALLY WOULD NOT DRIVE IT UNTIL YOU FIND OUT FOR SURE BECAUSE YOU MIGHT TOTALLY RUIN YOUR ENGINE BLOCK OR YOUR HEADS. JUST MY 2 CENTS.