Question about 1999 GMC Suburban

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99 suburban leaking from oil cooler fitting on radiator

Vehicle running hot. found steam escaping from oil cooler line on drivers side of radiator just under radiator hose. Is this a simple fix of just tightening the nut or is there more to it?

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  • Jerry Myers
    Jerry Myers Aug 09, 2012

    I have the same issue (leaks coolant) from around the retaining nut. It appears that the rubber fitting from inside the plastic tank that stops coolant from leaking is gone Is there a replacement part?

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  • 2,317 Answers

It sounds like you might have a crack in the plastic tank of the radiator. If the line was leaking, I would think you'd see some oil leaking. Any anti-freeze leaking? When the truck is cooled down, I'd check the anti-freeze and oil level.

Posted on May 29, 2010

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I have a 2001 Chevrolet Suburban 2500 4x4 6.0 liter engine. This vehicle has engine oil cooler located the radiator tank drivers side. I have developed a coolant leak located where the upper threaded...


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Radiator is leaking, on the drivers side of car. 2002 Chevy Avalanche, 4 wheel drive trcuk. One owner, 106000 miles on it.


Removal & Installation To Remove:
WARNING
To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is on or is still hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.
CAUTION
If the vehicle's coolant is low, drained out, or has repeatedly needed coolant or water added to the system, then the system should be completely flushed.
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    • Radiator bolts
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To Install:
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How do you change the radiator on a 1996 Buick Skylark?


GM Grand Am/Achieva/Calais/Skylark/Somerset 1985-98 Radiator - REMOVAL & INSTALLATION
CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
A cross-flow radiator is used on most models. The radiators used on automatic transaxle models are equipped with oil coolers with inlet and outlet fittings for transmission fluid circulation. An aluminum-plastic radiator can be identified by the black plastic side tanks and aluminum radiator.
  1. Disconnect the negative battery cable.
  2. Drain and recycle the engine coolant.
  3. If necessary for access to the radiator, remove the air intake duct assembly or air cleaner assembly.
  4. On automatic transaxles, disconnect and plug the upper oil cooler line.
  5. Disconnect the engine strut brace at the radiator, loosen the engine side bolt and swing aside, if equipped.
  6. Matchmark and remove the hood latch from the radiator support.
  7. Detach the upper hose and coolant reserve tank hose from the radiator.
  8. Disconnect the forward light harness and fan wiring. Remove the electric cooling fan. On some models this may not be able to be removed unless the front end of the vehicle is raised and supported.
  9. Raise and safely support the vehicle.
  10. Remove the engine cooling fan if not yet done.
  11. If equipped, remove the splash panel below the radiator outlet hose. Detach the lower hose from the radiator.
  12. If equipped, disconnect and plug the lower oil cooler line.
  13. Carefully lower the vehicle.
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To install:
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  5. Connect the lower hose(s) and attach the splash shield if equipped.
If the engine cooling fan was removed while the vehicle was in the air, install the assembly and attach all electrical wiring.
  1. Carefully lower the vehicle.
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  3. Connect the upper hose and coolant reserve tank hose.
  4. Install the hood latch and strut brace.
  5. Fill the system with coolant.
  6. Connect the negative battery cable, then start the engine. Run the vehicle until the thermostat opens, fill the radiator and recovery tank to their correct levels, then check the automatic transaxle fluid level.
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Hopew this help (remember comment and rated this) TY for using Fixya.

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Ford Contour/Mystique/Cougar 1995-1999 Repair Guide

Radiator -REMOVAL & INSTALLATION
(see Figures 1 through 7)

7249321.jpg
Fig. 1: Remove the upper radiator hose from the radiator


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Fig. 2: Use a back-up wrench to remove the transaxle cooler line connections-automatic transaxle only


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Fig. 3: the lower transaxle cooler line connection


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Fig. 4: Remove the passenger side radiator mount and ...


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Fig. 5: ... and the driver's side radiator mount


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Fig. 6: The condenser can be support using mechanic's wire as shown here, or another suitable device


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Fig. 7: Carefully lower the radiator out the bottom of the vehicle
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1 Answer

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Oil leak


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Oct 05, 2008 | 1999 GMC Suburban

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