I tip my hat to you sir. :D
Though, statistically, it's quite unlikely that the OP's car has a three-way thermostat. But I didn't see any car make or model in the thread so I can't be sure.
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err... what make is your van?
check the overflow cannister.. if it's likewise empty, then you're overheating. if it's full, your leak may be in the engine, or somewhere well-hidden in your radiator, or your water pump..
check also the radiator cap.. baka sira na ang rubber lip..
Thanks sa mga reply mga sir! My van is Mitsubishi Delica 1992 model, when my radiator tend to loose 1.5 liter of water last week when i go out of town, going to work and i experience traffic. I always check my radiator everyday before going to work yesterday EDSA day so theirs no traffic when i check this morning wala naman bawas yung radiator ko. Im planning to put coolant and pa linis na rin ung radiator ko i sabay ko na sa tune up. Thanks so much mga sir well appreciated mga reply's niyo :)!
Sir vin247,
If you already checked / applied the suggestions made by our Tsikot Guru's, try also checking your radiator clutch fan if it is loose already. Loose clutch fan is very inefficient in cooling your radiator specially at high RPM's, thus causing high temp and probably premature water evap.
sir yun clutch fan is the 2nd aux fan yun isa kasi is for the aircon
Sir, yung clutch fan na tinutukoy dito ay yung "clutch fan kung saan naka-connect front blade ng fan sa harap"
pag sumilip ka sa sasakyan at rear wheel drive, makikita mo after the raditor yung puti na blade, naka-attach yun sa clutch fan....
iba yung sa clutch ng manual transmission
transmission clutch
http://i1107.photobucket.com/albums/...ps375eccf7.jpg
http://i1107.photobucket.com/albums/...psaec898fa.jpg
Radiator clutch fan
http://i1107.photobucket.com/albums/...psb248bfb6.jpg
http://i1107.photobucket.com/albums/...psd68ff4b1.jpg