HOW DO YOU FIX THE REAR HEATER. THE HEATER ONLY BLOWS COOL AIR AND THE HEATER WILL NOT WORK ON MY 1999 GMC SUBURBAN.
Your lines going to the back may be plugged up and the antifreeze is not able to flow through the rear heating system. disconnect your cooling lines at the back and see if there is coolant in both sending and return line hook a garden hose to the lines see if you can flush out the whole heater system in the back
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