My coolant level is down about 5-6"..and i put plain water in about a month ago..?

(2011-11-11 15:20:07) 1. jimgreg Says: i watched the water..and even after putting the cap back on..it did go down..then thought to look today..cuz my heat isn't all that should be..not to me anyways..blazers sure have there issues..so the coolant going down,for no reason,but only 5-6" or less~!! theirs no leaks anywhere..so the water has to be full before the top hose let water into thermostat to heater core hoses?????2. Bob Says: The coolant should last longer, maybe you have a problem with the radiator or a leak... Or maybe you use your blazer too much with high temperatures outside. Just go see a mecano, he should tell you whats the problem for a 50 bucks3. Kenny Says: get a new radiator cap. Tag: My coolant level is down about 5-6"..and i put plain water in about a month ago..?