Most likely, you need to bleed the cooling system. Did you replace the o-ring with the thermostat?
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SOURCE: Reverse lights inop on 2001 Ford Explorer Sport
Sounds like a bad back up light switch. Most are located in console w/ shifter.
SOURCE: Bublling in the thermostat housing and very hot upper radiator hose
I recommend flushing the radiator thoroughly if not done recently. there seems to be some sort of blockage in the radiator at this time. if you get lots of metal fragments that are flushed out during this flush, i will then recommend a rebuild on the radiator or replacement of the radiator. make sure the cooling fans are cycling on time as well.
SOURCE: Where is the thermostat on
Find the radiator, big black thin rectangular shaped thing in the front. It has two large black rubber hoses connecting it to the engine. Where the top hose connects to the engine is the thermostat housing. Inside that housing sits the thermostat.
SOURCE: 2003 ford explorer sport trac 4 x 4 xlt 63,000
Is it coming from your belt? Where is it coming from? You might have a pulley sticking.
You might have a plugged heater core. But first check and see if you have a water flow valve located in one of the heater hoses, if so it might be bad or if controlled by vacuum the feed line might be bad. But getting back to the heater core. Run your engine to normal opper. temp. and run your hand down the radiator starting at the top down to the bottom. If it is hot on top and cool on the bottom your radiator is plugged. It will have to be removed and flushed by a radiator shop because at this stage its to late to use an additive and flush it yourself. If the rad. is plugged chances are so is the heater core. (the core can be flushed by you) most people don't realize the importance of changing the coolant. The charging system on a vec. relies on the ground side of the battery to recharge the battery. If you notice the ground cable is bolted to the engine and so is the alt. Battery power enters the alt. gets boosted and runs through the engine to the ground cable and back to the battery. This is called electrolysis. over time the coolant becomes energized to prove this take a volt meter ground the black lead to the block and clip the red lead the to shank of a screwdriver and carefully lower the shank into the rad. (not touching the rad. just the coolant) look at the reading you will see voltage. This problem causes the coolant to break down ergo plugged components. Once you have cleared the radiator remove the heater hoes from the core ( if the hoses are stuck do not try to turn them with pliers or anything else you can damage the core) Use a box knife can cut the hoses vertically not horisonally Trim hoses later. Next take the mail end of a garden hose and cut it off to length, slip the cut end onto the bottom hose connection of the heater core and install your regular garden hose to that connection and run the water. Unless it is severally plugged it should clean it out. I hope this helps Good luck
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