Have an 02 Chevy Venture, heater sometimes blows cold also all lights flicker at night, headlights & dash lts?

Question

The heater sounds like the air is on with a slight hissing especially on defrost. Was driving home and it just went to ice cold for about 5 seconds then warm again. The lights click a bit when flickering, and they flicker about 4 times a minute.

Answer 1

you have a bare wire, or one which is broken but still making contact but opens momentarily as you move. it may also be a loose connection. if you don't know anything about car electrical systems, have your mechanic fix it.