GMC Yukon 2000–2006

Outside the documents and the records

The five pages read are all question-and-advice exchanges on Q&A sites, and none records that the vehicle's heads were confirmed to be Castech castings. A repair outcome is reported in only two places: the head replacement another poster describes on the 2004 Tahoe page, and the water pump replacement on a 2000 Silverado. The one 2003 Yukon page ends with the cause unknown. No Japanese shop record was found.

• A 2008 question on 2CarPros (2004 Tahoe, 103,000 miles (= 165,762 km)) says a mechanic's cooling-system pressure test found no leak. Another poster on the same page writes that the same symptom turned out to be a cracked head, that the coolant loss stopped once the heads were replaced, and that the engine has had a "skip" since. 2CarPros
• A 2016 question on 2CarPros (2003 Yukon, 5.3L, 272,000 miles (= 437,742 km)) says coolant had been going down slowly for months, and that on a cold start water or coolant sprays onto the ground with one puff of white smoke or steam. The radiator, hoses, water pump and thermostat were renewed, the intake manifold gasket was replaced after sludge was seen in the oil pan, a reagent colour-change test at the coolant reservoir was negative and compression was 210 on all eight cylinders, yet the cause was still not found. 2CarPros
• Two 2009 questions on 2CarPros (a 2003 Silverado at 66,000 miles (= 106,217 km) and a 2004 Silverado at 108,000 miles (= 173,809 km)) put the loss at roughly a quart each week and at over a gallon since late November respectively; both say there is no sign of an external leak and no coolant seen in the oil. The answerer on the 2004 page writes that he has replaced many heads for this symptom, that the cracks are hard to see and that a pressure test is the only way to find the leak. Neither page reports what was found on that truck. 2CarPros2CarPros
• A 2018 question on Car Talk Community (2000 Silverado 1500, 5.3L) is a case where the head was not the cause: the owner, who had asked about a coolant leak of unknown origin, later writes that the water pump failed and was replaced, and reports no further trouble after that (there had been no overheating, and no coolant in the oil as far as the dipstick showed). Car Talk Community

The sentences above were written by FaultCrate from what shops' public pages and Q&A sites state as fact (none of the pages' wording is shown; a second reader checked each against its pages). A record of another vehicle says which vehicle. A Q&A thread is a question and advice, and may not say how the repair ended. The links below are places to look; the contents of pages not read were not checked.