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First make sure that the heater core is not leaking and if that is okay do the following....
1. Make sure that the a/c drain is not clogged up.
2. If that is okay and draining correctly then the evaporator core itself is very dirty..
3. Buy a product called BG Frigi Fresh and spray the first can into the recirculating vent while the a/c is running on the low speed and then spray the second can into each vent on the truck and let it sit for 24 hours.
4. This will be the only thing that you can do if both the drain is not clogged and the heater core is not leaking aside from replacing the evaporator and cleaning the complete venting system………….
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