One problem related to coolant leaking has been reported for the 2004 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 GMC Yukon based on all problems reported for the 2004 Yukon.
Engine losing coolant, with no apparent signs of leakage. Coolant appears to be leaking into the engine oil, causing it to sludge, thereby causing engine failure. Gm is aware of an issue and issued TSB 06-06-01-019b for defective cylinder head casting. I bought this car used last year and now owe 10000 for a car that needs a 6000 engine replacement. Gm should be made accountable for this since they are well aware of the issue, per their own directive.