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You trucks heater core is leaking inside the dash heating vents, the air blower motor blows through the heater core and then you smell the leaking coolant in the form of a sickly sweet vapor. You will need to replace the header core, this is a fairly big job and in most cases best left to a professional.
THE 1966 FORD MUSTANG YOU HAVE EXTERNAL FIELD RELAY ITS AIR GAP IS .015 POINT GAP .020. VOLTS TO CLOSE 2.5 VOLTS THE VOLTAGE REGULATOR AIR GAP .049 - .056 POINT GAP .017 - .022 VOLTS AT 125 DEGREES TEMPERATURE IS 13.8 - 14.4 VOLTS.
its a fungus from running the air the drain hole is probably clogeed and it dont drain right so calcium builds up try running the heater and spraying lysal in the vent on the outside by the windshield
It is mounted on the passenger side, front fender about 2" inside of the finder edge and about 1" forward of the rear edge of the cowl vent. This photo gives you a good look.
http://www.mustangdreams.com/Ford-Mustang-1966.htmTo get an exact measurement find a 1964-73 Mustang and measure it.
Well, this definitely sounds like you have a blown head gasket, and maybe a busted heater core (water vapor out of air vents). Both were probably caused by the car overheating creating a lot of pressure in the cooling system and blowing the head gasket(s) and maybe the heater core. The vapor out of the vents could also be caused by external coolant leakage of the head gasket on the hot engine bringing the vapor inside the cab via the heater fan...
I'd get that checked before any major engine damage happens...
This problem is caused my the blend door actuator motor, the electric motor turns to allow the flap to open either to cool or heat and then through the vents. The problem has been either the motor is going bad or the actual motor stops working. There are small plastic gears that strip in the motor causing this. I have replaced several in the rear unit. The front one is under the dash next to the heater core. The dashboard must be removed. It is a big job.
Please rate me and let me know if this helped.
IF YOU HAVE A HEATER CONTROL VALVE IT MAY BE PLUGGED OR STUCK HALF WAY CLOSED. THIS VALVE IF YOU HAVE ONE WILL BE ON ONE OF THE TWO HOSES GOING TO YOUR HEATER CORE. USUALLY CABLE OR VACUUM CONTROLLED. REPLACE THE HEATER CONTROL VALVE AND IT WILL RESTORE THE WATER FLOW TO THE HEATER CORE.
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