Question about 1992 GMC Safari
Did you change the thermostat?
if so. disconnect the upper hose that is connected to the firewall, it is the return for the heater core. and disconnect the lower hose as well. hook a water hose to the upper side and start with a low flow as to not blow out the finns. if this does not work you may have a stuck valve under the dash that opens the heat flap.
Posted on Apr 16, 2014
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Posted on Jan 02, 2017
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