View Full Version : After replaced water pump and thermostat truck overheats why?
scbrown65
Oct 5, 2013, 12:08 PM
I already replace the water pump, bypass hose and thermostat but the 2000 mercury mountaineer still is overheating why?
TxGreaseMonkey
Oct 5, 2013, 12:34 PM
You may need to replace the radiator, due to mineral build-up blocking the passages. Replace the radiator and refill with a 50/50 mixture of antifreeze and distilled water; otherwise, buy premix.
hernandezv86
Oct 5, 2013, 12:34 PM
Sounds to me like the impeller on the water pump is turning the wrong way, not circulating the coolant
odinn7
Oct 5, 2013, 04:08 PM
Was it over heating before you did this work? It could be the radiator is bad or you could have a bad head gasket even.
TxGreaseMonkey
Oct 5, 2013, 04:59 PM
Did you install the thermostat correctly? Was it an OEM thermostat?