Hello. I start by saying I'm ok around a vehicle not an expert but a parts changer. I lent my dad my 03 hummer h2 so hE can go to Home Depot. I live in NY so it's cold and getting worse. I told him warm truck up before he leaves. He tells me it will warm up while he is driving it. Smdh. He brings it back to me with no heat and engine light on. I say man this thing was fine before u took it. I have my own engine scanner. Code reads multiple misfires. I replaced plugs maybe 10 to 15k ago. As far as heat idk. Heater core is not leaking from what I can see and there is antifreeze in reservoir. I don't know if anyone has experienced this with a GM vehicle. But this is a first for me. I keep reading about blend door actuators but I've never read or heard of these before. Any help would be great
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