I do not have a coolant leak or blower problem. Last summer i had same problem but it would blow cold every couple of start ups and stay cold entire time truck was running. now its not working period. aslo, my controls wont switch blower vents when i turn knob. is there a control replacement fix for this?My '99 Gmc sierra has coolant but wont blow cold air, and a/c dash controls sometimes wont work properly?
Short in the wiring also check all of your fuses.
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