Here are some reasons why your Tahoe's AC might still not work despite a fresh recharge:
* Compressor Failure: This is a common culprit. The compressor is the heart of the AC system, and if it's seized, broken, or malfunctioning, the system won't work regardless of refrigerant level.
* Condenser Issues: The condenser (located in front of the radiator) dissipates heat. If it's clogged, bent, or leaking, it won't cool effectively.
* Evaporator Problems: The evaporator, located inside the dashboard, cools the air blowing into the cabin. Leaks, clogs, or freezing can prevent it from functioning.
* Expansion Valve/Orifice Tube Problems: These components regulate refrigerant flow. A restriction or failure can prevent proper cooling.
* Electrical Issues: Problems with the AC clutch, blower motor, pressure switch, or other electrical components can prevent the system from engaging or working properly.
* Leaks: Even with a fresh charge, if there's a leak somewhere in the system (in hoses, seals, the condenser, etc.), the refrigerant will escape, rendering the recharge temporary. A proper leak detection is crucial before recharging.
* Blower Motor Problems: The blower motor itself might be faulty, preventing air from circulating even if the AC system is producing cold air.
What to do:
If your AC is still not working after a recharge, you need to have a qualified mechanic diagnose the problem. Simply adding refrigerant without checking for leaks or other issues is a waste of money and could damage the system further. A proper diagnostic will involve checking pressures, inspecting components, and potentially using leak detection dye. Don't attempt major repairs yourself unless you have significant automotive experience and the right tools.
