heater on 2002 Buick Rendezvous

owner says it doesn't put out any heat.

Asked by for the 2002 Buick Rendezvous
more info please. does the blower work?? any other symtoms??

well the coolant was real low. filled that up. filters in glove box were completly pluged. turned heat up on controls . got heat. do you have to have them filters in glove box.
let us know when there is more info available

ok thanks