New from Classic Auto Air – Mopar B-Body Heater By-Pass “h” valve. Fits 1966-70 Mopar B-Body & most 1965-68 C-Body cars with factory a/c.
Installs on the heater coil as shown below. The by-pass valve’s main function is to regulate whether all or only half of the heater coil is used, based on dash control settings.
To prevent leaking hot water from inside the car and ensure that your heating system is functioning correctly, it should be replaced anytime the heater coil is replaced.
The cost of the valve is $69.99 plus s/h.
Part # is 18-H1990.