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Re: 1995 ford thunderbird4.6 engine running hot. changed...
Either your head gaskets are bad, or your radiator is bad. If there is no coolant, or muck on your oil dipstick, then it is your radiator. Replace it and your issue will cease. It's worth the expense to buy a "new" one. Used may be good for a week, a month, or 2 years; you never know.
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3.3 AND3.8 ENGINES TAKE OFF SERPENTINE BELT 15MM ON BELT TENSIONER . REMOVE 2 HOSES OFF PUMP. 5 ?BOLTS AROUND WATER PUMP. IT WILL COME OFF WITH ANTIFREEZE LEAKING OUT. HAVE DRAIN PAN UNDER . ALSO IT IS GOOD TIME TO CHANGE THE LOWER HOSES. REINSTALL WITH NEW GASKET, FILL SYSTEM, PUT HEAT ON HOT AND RUN UNTIL THERMOSTATE OPENS, AND CHECK FOR LEAKS, TORQUE IF NESSESARY ( ENGINE OFF)!!REFILL AT SIDE TANK
seems to me that you could have an air lock, try loosening the rad cap slightly and run car until fans kicks in, squeeze upper rad hose a few times to push any air out. Careful with hot hoses. see if this helps.
feel the hoses that go into the heater core at the firewall,if both are hot,either a door under the dash is stuck shut or you need to flush your heater core by removing both hoses and flush with water hose
The water pump has what's called a 'weeping hole' built into it. If the pump is bad You'll se water coming out of the hole. When was the last time you flushed the radiator? It may be your radiator cap is bad, they should be changed once a year & the radiator flushed. You can also test ur thermostate. take out ur thermostate & put it in a pot of water so that the water covers the thermostate. Then put a cooking thermometer in the pot to & heat the water til it says 195. u should see the car thermostate begin to open. if it don't it's bad & needs replacing.
Could be the water pump or the serpentine belt is slipping on the water pump pulley. Is the radiator coolant hot? If it is, the coolant is not circulating through the block and heater core. I am assuming you see and hear no leaks and you have installed the thermostat in the correct direction to match the coolant flow.You should be able to squeeze the radiator hose before the thermostat and feel it expand when you have the engine running. You might be able to splice a hose with a T connection and valve to see the flow. Otherwise you would have to take out the pump and check the impeller.
does it run hot while driving or in traffic?
if running hot at idle could be water pump not circulating enough try revving engine some and see if temp comes down. also check your fan clutch.
if running hot going down road probably radiator