How to fix heater problems?

Look for coolant leaking around the plastic intake manifold. These engines are notorious for leaking there. Also, if your coolant recovery tank was empty you need to remove the upper radiator hose with the thermostat housing and remove the thermostat. Refill the cooling system through the hole where the thermostat goes. Remove the cap from the plastic coolant recovery tank while doing this. Once the engine is full, replace the thermostat and thermostat housing and start the engine. Continue to top off the plastic coolant recovery tank until the coolant stops going down. This procedure MUST be followed whenever you have a major coolant loss or the system is serviced/repaired. Hope that helps! Jim