HEATER NOT GETTING ANY ANTERFREEZE THOUGHT IT

If the heater hoses are getting hot, and the radiator is full of coolant, you could have a problem with one of the blend doors under the dash. The blend doors direct air flow thru the heater core and the vents.

it can be the thromstat,but have you check to see if both heater core hoses are getting hot. if only one is getting hot then you need a heater core

make sure you get ALL the air out run it without cap until you see water circulate turn heater to hot NO FAN ABOUT 5 MIN close cap ,see if that works

Have you checked for vacuum leaks? Some vehicles from that era used vacuum pressure to control heating/cooling baffles. If you have a bad vacuum leak, then the baffle will never swap over from vent/cooling to heating.

should be the coolant fan thats in front of the raidiator

hi try this save to file then zoom in.

If fan doesn't work period, check fuse for blower fan, if fuse is good, check fan relay switch.

THE STOP LEAK MAY HAVE PLUGGED YOU HEATER CORE TUBES, BUT AT THE SAME TIME CHECK THE HEATER CONTROL VALVE. IT MAY BE RUSTED OR CORRODED AND INOPERABLE. IT WILL BE LOCATED ON ONE OF THE TWO HOSES THAT RUN TO YOUR HEATER. I WOULD START WITH THE HEATER CONTROL VALVE. GOOD LUCK.

repeat backflush procedure to replicate fix.....use a radiator cleaner to clear blockages with all heater switches open so it circulates cleaner through heater plumbing as well...is it global to all settings ..defrost/ main heat ..floor heat etc?

Sounds like Heater matrix blocked, check pipes going from engine bay into bulk head both should be getting hot if one is not then may be worth removing pipes and trying to flush it through as would be expensive to renew it as its a large job.