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Re: Aloha,have 98 base mustang, overheating after many...
Do the radiator fans come on? Turn on the A/C which should start the fans automatically. Does that stop the overheating? Replace the temperature sensor if engine heat doesn't turn on the fans (A/C off). The water pump can be checked by removing the thermostat and lowering the water level in the radiator until the tubes are exposed at the top. With the engine cold, start it and watch for water being pumped into the radiator (it should be a fair quantity), which points to an effective water pump. Shut off the engine, replace the thermostat, and refill with coolant.
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Make sure the engine is fully cold, open the radiator cap on the plastic reservoir, drain the coolant into a large pan by opening the plastic plug at bottom of radiator - reclose the plastic plug when drained. Cover the top half of the serpentine belt with a plastic bag. Remove the spring clip radiator hose connection at the engine block/thermo housing. Move the radiator hose back and forth gently until it breaks loose. Loosen the 10mm bolts holding the thermo assembly in place. Tap the thermo housing with a rubber or plastic hammer or pry the housing gently with a long blade screwdriver from behind by the lip, Remove the bolts all the way, remove the thermo housing, clean the circular ring area of debris in the engine block where the thermostat sits. Place the new thermostat assembly in place, torque bolts to 5 nm, then back and forth to 12nm then to 22nm. Replace the radiator hose, put on a new clamp and fill radiator with coolant as well as the plastic canister. put the cap on the reservoir, remove plastic bag from serpentine belt, start car - check for leaks, readjust coolant level after 20-25 minutes.
REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.CHECK MECHANICAL COOLING FAN.SHOULD HAVE RESISTANCE WHEN TURN WITH HAND.IF FREEWHEELS FAN CLUTCH NEED TO BE REPLACED.CHECK TO MAKE SURE AUXILIARY ELECTRIC COOLING FAN RUNNING HOT WIRE COOLING FAN IF FAN RUNS.YOU HAVE FAULTY THERMO SWITCH LOCATED AT THE BOTTOM OF RADIATOR ON THE LEFT HAND SIDE ON 4 CYLINDER ENGINE FOR V6 ENGINE THERMO SWITCH LOCATED ON THE LOWER RADIATOR HOSE ON THE RIGHT HAND SIDE OF THE ENGINE COMPARTMENT. CHECK FOR BLOWN COOLANT FAN FUSE OR FAULTY RELAY.IF THE AUXILIARY ELECTRIC FAN DONT RUN WHEN HOT WIRED THE ELECTRIC FAN FAULTY.
follow the bottom pipe of the radiator to the engine block. the thermostat is close to that.
a good idea would be to flush your system (get a bottle radiotor flush from a motor spares shop and follow instructions. It makes sense since you are going to be draining the system anyways and clearly you have an overheating problem so you are killing two birds with one stone
make sure the engine is off and cooled down. Hot radiator fluid is higher than boiling point.
remove the cooling system cap to ensure there is no pressure in the system.
loosen the hose clamps of the above mentioned pipe. remove pipe, from engine block and radiator.
Look for bolts on and close to where the radiator hose connects. there should be two ir three.
Loosen and remove. gently remove the housing. Be careful when removing the old thermostat and new thermostats do not come with the rubber seal you see around the thermo.
Replace with identical thermo. when replacing the housing remember to apply gasket sealant. this takes 8 to 12 hours to harden / cure.
replace the radiator hose to be one the safe side. tighten clamps, fill up radiator with anti-freeze/summer coolant and water.
SOUNDS LIKE YOUR THERMOSTAT IS STICKING,REPLACE THERMOSTAT FIRST OVERHEATING WILL DAMAGE ENGINE.IF THAT DOSEN'T WORK HAVE WATER PUMP CHECKED.FANS WON'T TURN ON IF HEAT FROM ENGINE IS NOT FLOWING INTO RAD BECAUSE THEROMOSTAT STUCK CLOSED,OR WATER PUMP FAILING
Make sure the radiator pressure cap is the correct one and that the hose is not soft--check the lower hose and heater hoses for softness as well. They should be firm, but not hard or cracking. The temperature sensor is reporting normal operating temperature, so it and the thermostat are working correctly (hot water would blow out of the radiator if it were stuck). Check the cooling fan for free turning and no noise. Check it's grounding connection. Check the fuse box for blown fuses to the fan and to the A/C compressor. Make sure all the relays and fuses are firmly pressed into their sockets. Check the A/C compressor clutch winding for resistance--should not read infinity. Does the blower motor for the heater/A/C run when either is turned on? The A/C switch on the dash may be defective.