sprayed off motor and now heater blows cold air

Hello, first, spraying water in your engine compartment is never, ever a positive thing to do. There's no benefit I know of, and the challenges you create can be many. You'll need to find out what component or components or wiring connectors have been disturbed relative to the water being sprayed. Impossible to know without inspection. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops