4.0L L47 , 4.6L LD8 , L37 LH2 Engine Coolant or Oil Leak - kw back block cylinder drive head intake main manifold panporosity rear

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Some vehicles equipped with the Northstar Engine may experience an engine coolant or engine oil leak.The coolant or oil may be appear to be leaking from the engine block at an area other than a gasket surface.

If all published diagnosis has been performed without success, then the engine block should be inspected for a condition of porosity. If the leak is found to be caused by porous engine block, the only GM validated repair procedure consists of the replacement of that engine assembly. No attempt should be made to repair the engine block (i.e. epoxy).

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(96-04 CADILLAC Deville,Seville KB 4.6L (LD8, L37) Engine) and (96-02 CADILLAC Eldorado EB 4.6L (LD8, L37) Engine ) and (96-02 OLDSMOBILE Aurora GB 4.0L (L47) Engine ) and (04 4.6L LH2 Cadillac XLR YB , SRX E6 4.6L (LH2) Engine )

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