I just bought a 01 A4 Quattro, it had recently had the timing chain tensioner replaced and the guts smashed out of a clogged cat converter, no check engine light is on, the temp gauges read normal, but after it runs for 20-25 mins there is a intense heat coming off the bottom passenger side of the motor, not real good with 4cly and or imports, is this normal? Anyone have a idea what it could be?