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2003 745li radiator reservoir is leaking from nipple that plug in at bottom of reservoir can the rubber it plugs into be replaced?

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  • Expert
  • 82 Answers

Yes, but you'll more than likely have to repair or replace the expansion tank.

Posted on Dec 04, 2012

  • Victor Guyton
    Victor Guyton Dec 04, 2012

    I have replaced tank. I think nipple on tank is smaller is why it is leaking

  •  Ray R
    Ray R Dec 04, 2012

    Make sure the sealing o-rings are good. They can replaced and are super cheap. Otherwise, I would suggest bringing it to your local radiator repair shop or mechanic.

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6ya6ya
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Posted on Jan 02, 2017

hi99ins
  • 123 Answers

SOURCE: leak in radiator reservoir and change spark plugs and wires

The plug change I already answered. hope that was enough...although a thought I just had was that some plugs have to be removed thru the wheel arches after removing the tire and inner protective shroud. I cant remember for your vehicle if thats one of the methods, you'll soon find out when u attempt removal of the old plugs.
BTW if you cant seem to get to one, do all the wires and other plugs and get a local mechanic to do the hard one. Dont be tempted to leave one crappy old plug in there you;ll undoubtedly get a large bite in the *** later on for that believe me. I aint done that but I have had to repair vehicles that had that old plug stuck in the rear of a V8 misfiring like hell.......
The coolant leak is not a big problem in the reservoir but if you can see it and/or get the reservoir off easily, I have fixed these a few times by drilling the leak hole round, then screwing in a self-tapping screw covered liberally in gasket ATV or regular silicone (bathroom mirror sealer) the reservoir need to be empty or below the leak line and dry so that the ATV/silicone will bond. A hot glue gun is also an ideal repair tool.
The problem with not repairing the leak is that the coolant pressure will not be right causing a change in the boiling point of the coolant, lowering the boiling point and reducing the cooling effectiveness of the coolant. This is a bit extreme for a small drip but under pressure that can turn out to be a real hisser....anyhow I probably overkilled this problem lol...hope u get it all done ok :)

Posted on Jan 07, 2009

emissionwiz
  • 75066 Answers

SOURCE: coolant leak at the top radiator hose

the plastic radiator tank that the hose nipple is part of can be replaced by any radiator repair shot for about $75-100

Posted on Apr 06, 2009

  • 1757 Answers

SOURCE: My 2002 Jeep Liberty 3.7 liter is leaking coolant

The Drain Plug aka Radiator Drain **** has an o-ring on it that does wear-out over time, causing a leak. You can remove and replace these relatively ease. They only turn 1/4th to 1/3rd Counterclockwise to Open and Clockwise to Close. Work on only when the engine is cool. Leave the cap on the radiator to create a suction, decreasing the amount of radiator fluid you will lose. OR drain the Radiator Fluid into a clean container and save for reuse.
Have the new Radiator Drain **** ready for immediately insertion after removing the other leaking Radiator Drain ****. To Remove:
Twist the Radiator Drain **** counterclockwise and pull, continuing to twist counterclockwise removing it.
Immediately install the new Radiator Drain **** by first pushing in and then twisting clockwise to close.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

Posted on Jan 30, 2010

Testimonial: "Thanks for your help and detailed instruction!"

  • 632 Answers

SOURCE: Oil and Coolant leak

The passenger right side of the car doesn't have any flanges for cooling system, if that's correct then your radiator has a leak or puncture.

The driver side of vehicle has both the in and out flanges for the radiator. Very common to see leak at the drain valve leaking (not closed tightly). In the same area would be bottom flange of radiator which the composite flange is degrading and causing the leak.

The middle part of the bottom engine compartment is where your oil/coolant cooler assembly just above the oil filter. A loose oil filter could be the cause 95% of the time and 5% would be a bad o-ring from the oil cooler to the oil filter flange.

Posted on May 15, 2010

rickyrt441
  • 4399 Answers

SOURCE: rubber type plug ( passenger side of radiator) on

That is your radiator plug. You take it out to drain the radiator. You just take it out and put another one in. Is your radiator fans working? It may be the radiator itself. Plus, it may be a coolant temp sensor. If it is a small leak, with full coolant, it wouldn't overheat quickly. Make sure the fans kick on. Check radiator.

Posted on Feb 11, 2011

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WARINING
Do not remove the cylinder block drain plugs or loosen the radiator drain **** with the system hot and under pressure. Serious burns from coolant can occur.

WARNING When removing the radiator or A/C condenser for any reason, note the location of all radiator- to-body and radiator-to-A/C condenser rubber air seals. These are used at the top, bottom and sides of the radiator and A/C condenser. To prevent overheating, these seals must be installed to their original positions.

Removal & Installation:
  1. Disconnect battery negative cable.
  2. Remove radiator pressure cap.
  3. For access to radiator draincock, remove radiator grill mounting screws and remove grill.
  4. Attach one end of a 24 inch long x 1 / 4 inch ID hose to the radiator petcock Put the other end into a clean container. Open petcock and drain radiator.
  5. Detach power steering fluid reservoir from fan shroud and lay aside.
  6. Disconnect electric cooling fan electrical connector, if equipped
  7. Disconnect CRS hose from radiator filler neck and remove from shroud retaining loops.
  8. Remove the four (4) viscous fan/drive assembly nuts from the water pump pulley and remove fan/drive assy.
  9. Remove the four (4) fan shroud to core support mounting screws.
  10. Remove the electric fan (if equipped) and shroud assembly from the vehicle
  11. Remove radiator upper crossmember.
  12. If equipped with air conditioning, separate radiator from condenser by removing condenser-to-radiator mounting brackets.
  13. Disconnect upper and lower radiator hoses.
  14. If equipped, disconnect and plug automatic transmission fluid cooler lines. Quick Connect Fitting Release Tool 6935 may be needed. If equipped with remote transmission cooler, remove line to cooler from bracket at bottom of radiator
  15. Lift radiator straight up and out of engine compartment taking care not to damage fins.
  16. If radiator is to be replaced, be sure to remove and transfer any components not included with replacement radiator.
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To install:
  1. The radiator is supplied with two alignment dowels. They are located on the bottom tank and fit into rubber grommets in the radiator lower crossmember.
  2. Lower radiator into engine compartment. Position alignment dowels into rubber grommets in radiator lower crossmember.
  3. If equipped with air conditioning, attach condenser to radiator with mounting brackets
  4. Install radiator upper crossmember and four mounting bolts.
  5. Install radiator upper crossmember-to-isolator nuts. Tighten nuts to 86 inch lbs. (10 Nm) torque. If isolator-to-radiator nuts had been removed, tighten them to 47 inch lbs. (5 Nm).
  6. Connect radiator upper and lower hoses.
  7. If equipped, connect automatic transmission fluid cooler lines. If equipped with remote cooler, attach cooler line to bracket at bottom of radiator.
  8. Install electric fan (if equipped) and shroud assembly. Insert alignment tabs at bottom of fan shroud into slots in bracket at bottom of radiator. Tighten mounting bolts to 31 inch lbs. (3 Nm).
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  10. Install power steering reservoir to fan shroud.
  11. Install grill.
  12. Connect battery negative cable.
  13. Fill cooling system with correct coolant.
  14. Install pressure cap.
  15. Check and adjust automatic transmission fluid level (if equipped)
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For more details I suggest review the Service Repair Manual:
- Section-07-Cooling-System-Ewj7 (page 33 and next)
- Section-07a-Cooling-System-Ewj7a

I really hope helped with this (remember rated and comment this help) Good luck.

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