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if it is an automatic ( make and model omitted in question) there is every chance that it is transmission oil from a burst cooler in the radiator tank. The fix is a new radiator or and air to air cooler core fitted in front of the radiator. If the engine is a diesel or an engine that has a sump oil cooler then the oil core has burst allowing engine oil into the radiator vial the coolant system. It may be from a failing head gasket where the oil hole to the rocker gear is leaking across to a water jacket
If it is the front seal in the gear box then the box has to come out. The seal is in the extension housing that the clutch throw out bearing runs on and the seal can be replaced by removing that housing . However mostly if that seal leaks then the front bearing on the clutch shaft may be failing allowing the shaft to move and that is why the seal leaks. If the front of the box is dry then the oil leak may be the rear main seal of the engine so it is best to check both arrears as the oil leaks from the same point in the bell housing
Check the sump gasket at the rear of the sump tension sump bolts. Check that the rocker cover gasket is not leaking down the back of the engine and giving the appearance of a sump leak. Rear crank seal would be another point of leak and front input shaft (clutch shaft) seal leaking. Check the engine oil level and correct if necessary and check gear box oil level and correct if necessary. If you have an auto the oil will be pinkish and indicates a torque converter to gear box seal leaking.. Either of the shaft seals will require the box removal for repair.
not sure if you can interchange the manual & aut shafts, but you should check to see if there is excessive play where the shaft enters the gear box if so the diff bearings my be worn, if there is no play or noises from gear box when driving, remove the shaft again an try the seal on the shaft to check it's a proper fit, before fitting seals it is a good idea to leave them soaking in oil for a few hours prior to fitting
what box?? gear box are described as tranny, differential and steering box. if steering is leaking check the seals at input shaft or bottom replacement is nessary but can be done pretty easy and cheap too. if leaking from hose then you looking as a hydraulic hose like $80 or so..
YOU carnt have a transmission oil leak from the front axle on a Falcon as they are Rear wheel drive but could be the hose going to the radiator over the front end leaking But the rear end of G/Box should be only the OIL SEAL.
actually it is not good idea to replace your coolant by water only you shoul full your coolant system 50/50 mixture coolant and water because coolant has uniqe smell and color so easier to identified leaks.
first check your oil condition and coolant reservior for any coolont oil mixture for figure out head gaskets condition if you have any oil coolant mixture in oil or coolant you have a blown head gaskets this will send you to mechanic if everthing looks clear then go front driver side bottom of radiator and open the drain **** (make sure car is cool and put container under because coolant is toxic and mess up your drive way )open reservior tab too and drain all the water close back drain **** probably your vehicle prefer dexcool(red color)
fill 3 qt dexcool then water or just buy ready mix run the engine with reservior tab open and check coolont level add more if necesery suquize collont hoses for air inside when engine start hit up close reservior tab. on passanger side front of the engine has a coolant drain plug open with number 8 wrench untill you see the coolant come out( bleed the system for air) make this several times turn on your heat too and bleed again and watch your upper and lover hoses for any visible leaks fallow small coolant lines like under throttle body check thermostat housing under throttle body on 3.4l engines check under radiator if your pressure cab dosen't look good get a new pressure cab .shut of the car and check for leaks once you find out where is leak from easy to fix it.
The oil leak at bottom of radiator could be oil cooler and/or supply hose. Try check closely for wettest area . The other leak could be thermostat cover, it only uses a sealing ring and is prone to leaking after time.