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check antifreeze level add if low, and check intake heat control valve on ps side of intake if its locked shut it can be removed and a water pipe nipple put in place of it and the heater hose reconnected..if the water pump is good, it should give heat this valve should be on the intake with a heater hose connected to it..and its vacuum operated but will jam shut with age and cold weather..good luck..
ive found that when you do any coolant service to these trucks they get air bound. start the truck, let the temperature get up to 120, and with a rag crack open the radiator cap, but dont remove all the way...safety first. theis will draw the coolant in and get rid of the air bound. it had me confused for awhile also... not sure if this helps...or too late
From your comments, your clutch master is no longer working. Check your clutch master, and replace all the worn out parts. You can buy all of these in one pack, specify Clutch Master Repair Kit for 1989 GMC Sierra.
be more specific,head unit could mean cylinder head/s could mean thermostat unit,were the hoses hooked up right? thermostat should be checked before installing,very easy to do could be stuck shut.was the heater core checked or flushed out?lots of maybys,wish it was in my garage..