I have a 1998 Ford Explorer 4.0 EFI with 120K miles. For a while now, warm air blows out of all ac/vent settings but MAX AC. When on the MAX AC setting, the AC works good. I have replaced the heater control valve but still the same. I have also compared the hoses to the heater control valve with an Explorer that works and they are at the same places. When on MAX AC, the heater control valve engages and cold air blows out the vents. When on AC or a vent setting the heater control valve disengages and warm/hot air blows out the vents. I suspect a vacuum problem but don't know where to look. Any ideas?
Sunday, June 3rd, 2007 AT 6:05 PM