2004 CADILLAC XLR LY2 (GMXLR1)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Timing belt replacement interval critical at 60,000 miles
• Occasional issues with Northstar cooling system thermostat

First checks

• Verify timing belt condition and replacement history
• Inspect cooling system components, especially thermostat and radiator

Antes de cambiar piezas

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• The 2004 XLR was only produced with the Northstar 4.6L V8 (engine code LY2) in North America and select global markets.
• No manual transmission was offered for the 2004 model year.
• Market variations are minimal; European versions were largely similar with regional emissions compliance.