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1998 Ford Explorer Overheating - Heating & Cooling System
Question: I have a 1998 Ford Explorer, v6, 5-speed... The Temp guage is constantly going to the H side and the "check guage" light comes on. This problem just started. The heater is very hot. It's never really been that hot for quite some time. It will usually cool off if I can get the RPMs up over 2500 during idle. It will usually heat up if going up a slight incline and cool down if going down a decline. The top left hose to the radiator is extreamly hot, and the lower hose is extreamly cold. When I turned it off, I could hear a "gurgling" sound. I carefully released the pressure on the radiator and the water started flowing in the backup container. The water was only luke warm. Is this a sign of a stuck thermostat or something else? If it's the thermostat, is this something that I can easily replace? If so, will there be any lose of radiator coolant that will need to be replaced?
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Technican: First a couple of questions. Do you change your anti-freeze every year. I ask this because it is required preventive maintenance. If not I would start with flushing the radiator to remove any build up of scale and sludge. Next I would replace the lower radiator hose.. why, because they have been know to collapse internally and although the hose looks intact.. it is restricting the water to the water pump and causing high temps.. 2nd.. I would replace the thermostate with a 180 deg .. follow the upper hose to where it attaches to the engine and remove this component.. it should be 2 or 3 bolts and remove the copper part (the thermostate), replace the thermostate and gasket then fill up the engine with 50/50 water and fresh anti-freeze. MAKE SURE YOU INSTL THE THERMOSTATE THE SAME WAY IT CAME OUT, NIPPLE POINTING UP!! While warming up the engine make sure you have the heat on highest setting to allow the heater core to fill up also. . Here's How To Get Guaranteed Solutions In Minutes
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