33
Heater Control Valve Operation
Picture A under hood manual valve location in the Lincoln Town Car
Your limousine is equipped with a manual heater
control valve (see picture A below) and an electric
operated heater control valve. The manual valve was
installed to ensure maximum performance of your
air conditioning system during times of high ambient
temperatures. The manual valve will shut off flow of all
hot water to the heat exchanger located in the heating/
cooling system servicing the rear passenger cabin.
(pic. B) manual valve in off position stops hot water flow
(pic. c) manual valve in on position allows hot water flow
Accidental flow of hot water into the system,
either by the vacuum valve leaking or inadvertent
activation of the heater control by a passenger or
driver, will be eliminated by using the manual
heater control valve.
To shut hot water flow off during high temperature
conditions turn the manual heater valve to the
OFF position (see picture B below). During cooler
temperature conditions turn the manual heater
control valve to the ON position (see picture C
below).
NOTE:
The valve arm will cover its actual position. When the arm covers the ON position, OFF will be
revealed, the valve is actually ON or OPEN. Do not get confused. The valve arm must cover the position you
want it to be in.
The system will function properly between heat and air conditioning with the valve in the ON position but it
should be reset to OFF during extended periods of high ambient temperature. Without setting the valve to ON
your rear heat will not work.
