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When I did my block heater I changed the coolant as well. Here is what I did and I haven't had an issue at all:

Took the bleed screw out of the top of thethermostat housing

Filled up coolant through radiator cap until coolant started to come out bleed screw

Put Bleed screw back in and re-installed rad cap.

Filled up coolant reservoir to full mark on stick

Started truck and let it run wtih the heat set to high

let it get up to operating emp and then let it run for another 10 mins

Shut truck off and let it cool down

Any extra coolant it needed was sucked out of the reservior.

Topped up reservoir and it's been fine since

Also too what was said about the warranty - I would think that an 08 would still be covered...take it in.
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