Enough coolant? Thermostat stuck or maybe the blend door or actuator....is both heater hoses hot?
Check coolant level
Check engine thermostat is working (Is the temp. gauge registering normally?)
Check for air in the cooling system.
SOURCE: 1999 Chevy Cavalier A/C blows hot air
More likely the recharge blew a o-ring and you have a leak. When your Cavalier was blowing hot air and a recharge fixed it that means it was low on freon which lets o-rings dry out, go back to the shop and have them leak test it. They use a pressurized dye to find the problem. If it's blowing it's not the cooling fan relay, they may have meant compressor relay but I'd have a leak test done first it's not expensive and easier that chasing unknown possibilities.
SOURCE: 2005 chevy 2500hd duramax driver side vents blow hot air
It sounds like the HVAC head needs to be recalibrated, most likely when you unhooked the battteries you lost the memory to the control head, it's in a default position/state.
SOURCE: ac blowing hot air
the blend door actuator located on the air box (right hand side under dash) is prob. inop. worst case senerio the blend door its self is broken. I have replaced the actuator more than anything.
SOURCE: my heater stoped blowing hot air.antifreeze level
If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox and Pontiac Torrent,
Tech JK
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