1992 GMC 1500 suburban SUV heater will not work does not blow air no heat no noise

What is your question?

Purchased my 1992 GMC suburban SUV c 1500 one and a half months ago. ended up stalling while I was driving replaced the battery then replaced alternator. Now he's a will not work. It never worked right since I bought it the window light gauge for the heater never lit up. The heater was barely working and would only warm the car. Now it doesn't work at all since replaced battery and alternator.. I haven't noticed any loud noises or odd things going on with that except for the window light never worked and it worked barely before replacement of other items

What makes this problem better or worse?

It's almost as if it had no heater at all no noise no air no nothing. Rear defogger light comes on yet no fan or heat or noise

How long has your 1992 GMC C1500 Suburban had this problem?

Bought car 1 and 1/2 months ago wasn't working properly then no light showing gauges of fan etc. Heater barely worked barely blew out any more mare. Replaced battery and alternator 2 weeks ago