Oil in radiator - 1990 Nissan Sentra

RADIATOR
Removal
1. Disconnect battery ground cable.
2. Drain engine cooling system as described.
3. Remove engine air cleaner.
4. Remove upper radiator hose from water bypass tube.
5. Remove radiator overflow hose from radiator and fan shroud.
6. Remove transmission oil cooler line from oil cooler inlet fitting.
7. Remove nuts retaining A/C condenser core to the radiator.
8. Disconnect engine control sensor wiring from the auxiliary electric cooling fan motors and the CCRM.
9. Raise vehicle on hoist.
10. Remove splash shield from lower radiator support and front sub-frame.
11. Remove lower radiator hose from radiator.
12. Remove oil transmission cooler line from oil cooler outlet fitting on radiator.
13. Remove retaining screws for power steering/transaxle oil cooler and position cooler aside.
14. Support fan shroud, radiator and A/C condenser core with a suitable jackstand. Remove lower radiator
support.
15. Position jackstand aside and carefully remove radiator and fan shroud.
16. Remove two retaining bolts for fan shroud at top of radiator and remove fan shroud from radiator.
17. Remove upper radiator hose from radiator.
NOTE: Loosen transmission oil cooler lines while securely holding radiator
connector with a back-up wrench.
NOTE: Loosen transmission oil cooler lines while securely holding radiator
connector with a back-up wrench.
18. Remove the radiator.

RADIATOR
Removal
1. Disconnect battery ground cable.
2. Drain engine cooling system as described.
3. Remove engine air cleaner.
4. Remove upper radiator hose from water bypass tube.
5. Remove radiator overflow hose from radiator and fan shroud.
6. Remove transmission oil cooler line from oil cooler inlet fitting.
7. Remove nuts retaining A/C condenser core to the radiator.
8. Disconnect engine control sensor wiring from the auxiliary electric cooling fan motors and the CCRM.
9. Raise vehicle on hoist.
10. Remove splash shield from lower radiator support and front sub-frame.
11. Remove lower radiator hose from radiator.
12. Remove oil transmission cooler line from oil cooler outlet fitting on radiator.
13. Remove retaining screws for power steering/transaxle oil cooler and position cooler aside.
14. Support fan shroud, radiator and A/C condenser core with a suitable jackstand. Remove lower radiator
support.
15. Position jackstand aside and carefully remove radiator and fan shroud.
16. Remove two retaining bolts for fan shroud at top of radiator and remove fan shroud from radiator.
17. Remove upper radiator hose from radiator.
NOTE: Loosen transmission oil cooler lines while securely holding radiator
connector with a back-up wrench.
NOTE: Loosen transmission oil cooler lines while securely holding radiator
connector with a back-up wrench.
18. Remove Radiator

Diesel oil in with the coolant, in the radiator? Very unlikely. Engine oil in radiator indicates a leakage like head gasket, cracked block or head. Transmission oil in radiator indicates a leaky radiator where the hydrolic fluid is cooled inside the radiator.

Hello Todd, sitting here thinking about it only 2 things comes to mind. First question is it is an automatic. If so then your transmission oil cooler inside the radiator has a leak which in turn it leaking transmission fluid into the radiator. So if it is the transmission do you see any red gunk in the radiator or the water. Now same process if it is motor oil if it is a manual transmission. These new vehicle have motor oil flowing through the radiator to cool off the motor oil also known as the oil cooler. 9 times out of ten all you have to do is buy a new radiator or remove the metal or rubber lines running to the radiator and splice them together with high pressure hose. Which I recommend power steering return 3/8 hose, tough stuff. Just slide the rubber hose over the tube and clamp it down tight with a hose clamp and give it a whirl. But first I recommend you flushing the radiator. Good luck.

1. Disconnect battery ground cable.
2. Remove the battery.
3. Remove clip retaining constant control relay module and position module aside.
4. Remove battery tray.
5. Remove radiator cap.
6. Raise vehicle on hoist.
7. Remove radiator splash shield.
8. Drain engine cooling system.
9. Remove radiator mounting bracket assembly.
10. Remove lower radiator hose.
11. Partially lower vehicle.
12. Remove upper radiator hose.
13. Remove radiator overflow hose.
14. Remove upper A/C condenser core retaining bolts.
15. Remove upper A/C transmission oil cooler tube clips.
16. Remove upper transmission oil cooler tube (7C410) using 3-8 inch fuel line disconnect tool 310-041 (T90T-9550-C).
17. Raise vehicle on hoist.
18. Remove lower transmission oil cooler tube clips.
19. Remove lower transmission oil cooler tube using 3/8 inch fuel line disconnect tool 310-041 (T90T-9550-C).
20. Remove transmission oil cooler bracket and position transmission oil cooler aside.
21. Remove lower A/C condenser core bolts and position A/C condenser core (19712) aside.
22. Remove radiator support bracket.
23. Remove radiator.

Disconnect battery ground cable. Remove battery. Remove battery tray. Remove clip retaining contant control relay module and position module aside. Remove radiator cap. Raise vehicle front end as high as possible. Remove radiator splash shield. Drain radiator. Remove the radiator mounting bracket assembly. Remove lower radiator hose. Partially lower vehicle. Remove upper radiator hose. Remove radiator overflow hose. Remove upper A/C condenser core retaining bolts. Remove upper transmission oil cooler tube clips. Remove lower transmission oil cooler tube. Raise vehicle. Remove lower transmission oil cooler tube clips. Remove lower transmission oil cooler tube. Remove transmission oil cooler bracket and position transmission oil cooler aside. Remove lower A/C condenser core bolts and position A/C condenser core aside(be careful not to loosen the AC condenser lines. Remove radiator support bracket. Remove radiator out through the bottom of the vehicle.
Installation
Position radiator. Position radiator support bracket and tighten nuts. Position A/C condenser core and tighten lower A/C condenser core bolts. Position transmission oil cooler tube and install transmission oil cooler tube bracket. Install lower transmission oil cooler tube. Install lower transmission oil cooler tube clips. Install lower radiator hose. Install radiator mounting bracket assembly. Tighten bolts. Install radiator splash shield. Lower vehicle. Install upper tranmission oil cooler tube. Install upper transmission oil cooler tube clips. Install upper A/C condenser core retaining bolts. Tighten bolts. Install radiator overflow hose and tighten clamps securely. Install upper radiator hose. Position constant control relay module and clip securely. Install battery tray. Install battery. Connect battery ground cable. Fill and bleed cooling system. Start engine and inspect for leaks.

I Hope you Find this Helpfull And Please Remember to RATE ME

1. Drain the coolant.
2. Disable the SIR.
3. Move the forwarding discriminating sensor out of the way.
4. Remove the air cleaner assembly.
5. Remove the cooling fans.
6. Disconnect the radiator inlet hose from the radiator.
1. Disconnect the radiator outlet hose from the radiator.
2. Disconnect the engine oil cooler lines from the right radiator end tank.
3. Disconnect the transmission oil cooler lines from the left radiator end tank.
4. Remove the left and the right engine torque struts.
1. Remove the upper radiator support screws.
2. Remove the radiator from the vehicle. Lift the radiator up and out. INSTALLATION PROCEDURE
1. Install the radiator to the vehicle.
2. Install the upper radiator support screws. Tighten the bolts to 6 Nm (53 inch lbs.). NOTICE: Refer to Fastener Notice in Service Precautions.
3. Install the transmission oil cooler lines to the radiator. Tighten the transmission oil cooler line fittings to 27 Nm (20 ft. lbs.).
4. Connect the engine oil cooler lines to the radiator. Tighten the engine oil cooler lines to 18 Nm (13 ft. lbs.).
5. Install the left and the right engine support torque struts.Connect the radiator outlet hose to the radiator.
1. Connect the radiator inlet hose to the radiator.
2. Install the cooling fans.
3. Install the air cleaner assembly.
4. Install the forward discriminating sensor.
5. Enable the SIR.
6. Refill the coolant.
6. Hope this Helps and PLEASE RATE ME

THIS IS a 1995 LINCOLN CONTINENTAL W/4.6L ENGINE
iIBELIEVE TOWN CAR IS DIFFERENT LET ME KNOW IF SO AND PLEASE DONT FORGET TO RATE ME


REMOVAL

1. Disconnect battery ground cable (14301).
2. Drain engine coolant.
3. Remove engine air cleaner (ACL) (9600).
4. Remove upper radiator hose (8260) from water bypass tube.
5. Remove radiator overflow hose (8075) from radiator (8005) and fan shroud (8146). NOTE: Loosen transmission oil cooler lines while securely holding radiator connector with a back-up wrench.
6. Remove transmission oil cooler line from oil cooler inlet fitting.
7. Remove nuts retaining A/C condenser core to the radiator.
8. Disconnect engine control sensor wiring (12A581) from the auxiliary electric cooling fan motors and the CCRM.
9. Raise vehicle on hoist.
10. Remove splash shield from lower radiator support (16138) and front sub-frame (5C 145).
11. Remove lower radiator hose (8286) from radiator. NOTE: Loosen transmission oil cooler lines while securely holding radiator connector with a back-up wrench.
12. Remove oil transmission cooler line from oil cooler outlet fitting on radiator.
13. Remove retaining screws for power steering/transaxle oil cooler and position cooler aside.
14. Support fan shroud, radiator and A/C condenser core (19712) with a suitable jackstand. Remove lower radiator support. Position jackstand aside and carefully remove radiator and fan shroud.

1. Remove two retaining bolts for fan shroud at top of radiator and remove fan shroud from radiator.
2. Remove upper radiator hose from radiator.

INSTALLATION

1. Follow removal procedure in reverse order.
2. Tighten fan shroud bolts and A/C condenser core nuts to radiator to 3-5 Nm (27-44 inch lbs.) .
3. Tighten lower radiator support bolts to 8-11 Nm (71-97 inch lbs.) .
4. Tighten transmission oil cooler lines to fittings to 25-28 Nm (18-21 inch lbs.) .
5. Tighten power steering/transaxle oil cooler and splash shield retaining screws securely.
6. Refill engine coolant.

There are no oil lines that go from the Oil Filter to the Radiator.

There are Transmission Fluid Oil lines that go from the Transmission to the Oil Cooler on the Radiator.  Plugging these, or not having them connected - will cause rapid transmission failure from overheating.

Lots of people even add additional tranny coolers.  Especially if they do much towing...  If the line is broken right at the radiator - it must be fixed.  If it is broken a little ways away - you can reconnect the lines using tranny fluid hoses.

oil in a radiator indicates that the transmission oil cooler in the radiator tank has failed and leaking transmission oil into the radiator
there are 2 possible fixes
fix one is a new radiator
fix 2 is to give the radiator oil cooler a miss altogether and opt foe an air cooler mounted in front of the radiator
the advantages here are that the radiator then has a bigger capacity to handle the engine heat as there is no hot transmission oil adding to the engine heat
the second advantage is that the transmission oil is being cooled to ambient temp and not engine temp which makes for longer transmission oil life
the disadvantage is that it cost a bit more than a radiator initially but the long term savings are real
oil to air oil coolers are available from auto transmission shops and quality auto spares shops