2008 avalanche 5.3 overheati g
New thermostat, water pump, temp sensor, radiator, cooling
fans. Still running 220 degrees at idle. No signs of moisture
in oil or smoke from exhaust. If i sit in park and rev to 3000
rpm, it goes back down to normal 210 before very slowly
increasing to 220 again
You might have replaced the fans, but there's still some failure in the fan system. When the car overheats, turn on the AC. Fans work by default with the AC. You probably have a blown fuse or relay, defective fan clutch or wiring, or a bad fan temperature switch.
Fans turn on as they should, both high and low speeds. Also replaced all 3 relays and fuses.
1. Did you install the thermostat correctly; it's possible to put it in backward. 2. You might have air in the cooling system that needs to be purged (see videos on line that show you how).
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