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Need some help guys. Only warm air blowing out of the vents. Look at the pic and help me out. Hose going into the regulator is hot, hose going from regulator to heater core is hot. Hose going from core to engine is cold. That is the hose on the lower right. Is this the problem with the regulator? I would think not since it has hot flowing through both sides of it.
 
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