My 87 cutlass supreme does not blow heat. The blower motor does work i do have A/C. Is there a heater shut off valve for the g boy cutlass. What methods can i use to have heat? Thank you,

How long have you owned the vehicle? I bought a vehicle once to find out somebody had bypassed the heater core because it was leaking and quite the pain to replace.

The heater core lines are hooked up I was thinking maybe the heater core might be clogged?

I have had the car for about 5 moths. I have rebuilt the motor and did my a/c myself. Wish I had the diagram for the heater being that everything is vacuum lines.