Introduction to HVAC Underground
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Introduction to HVAC Underground
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Episode description
Welcome to the very first episode of HVAC Underground. Before you condemn a compressor, dump in a pound of refrigerant, or tell a customer they need a whole new system — listen up. Most rookie callbacks don't come from hard jobs. They come from five service calls that look dead simple and aren't.
In this episode we walk through the five calls new techs blow most often: what you think is happening, what's actually happening, and how to nail the diagnosis so you're not the reason the customer calls back. No fluff, no corporate spin — just the stuff you usually only learn after years on the truck.
If you turn wrenches, read gauges, or run service calls for a living, this one's for you.
What you'll learn
- Why a "no cooling" call is usually airflow — not refrigerant
- How to test a capacitor before you condemn a compressor (and pick the right microfarad)
- What a frozen evaporator coil is really telling you — and why adding gas makes it worse
- The low-voltage checks that save you from chasing a "dead" system for an hour
- Why charging by gauge pressure alone is how you earn a callback
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