Don in Mesa
TYF Newbie
-----------------------------------------------------------------------------------------------If this helps this takes literally zero mechanic skill. Start your truck. Let it warm up to temp. Like 15 minutes. Turn on your heat. Then pop the hood and feel these hoses (circled in blue) they should both be hot. (CAUTION. They might be HOT). If they are both hot then you can rule out the heater core. If one side is hot and one side is luke warm or cold then you probably need to flush the heater core. If both sides are cool. Then you’re low on antifreeze or heater core is really blocked up
My Tahoe had a blocked heater core when I bought it. Fixed it by flushing with a garden hose.
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As far as the air box. If something is missing then I’m gonna assume someone else was in there trying to fix it and somehow damaged the box... but I’d honestly get a 2nd opinion. Something has to be holding the current part in there now.
Excellent Idea! Will check this out and get back to the forum!