when using heater there is no heat

Have you checked the thermostat in the car?

Check the coolant level, operation of cooling system thermostat, the heater controls/heater valve may not be operating correctly or the heater core may be restricted. Most common cause would be thermostat failure. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online