2008 avalanche 5.3 overheating

Asked by Jun 25, 2019 at 09:05 PM about the 2008 Chevrolet Avalanche LT 4WD

Question type: Maintenance & Repair

2008 avalanche 5.3
New: radiator, cooling fans, temp sensor, water pump, fan
fuses and relays, thermostat, plugs, wires, all o2 sensors,
both cats.
Fans dont always turn on high when a/c is on. Normal temp
of 210 when driving, 225 when idle even if fans on high.
When at highway speeds, and punching the pedal, will get
sel and random misfire code. Shop found o2 wiring loop to
keep ses light off. They wired new sensors corectly, now I
get reoccurring p0420 and p0430.
Also, rough idle, poor gas milage and slight loss of power.
No coolant loss. A shop found no signs of head gasket
leaks and suggested cats, so I replaced them.

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