Finish Thompson CQC-HD - Manual (Page 6)

Sequence of Operation
This section is a brief overview of the operation of this equipment. The CQC-HD is a machine designed
to perform quick and simple engine coolant changes on larger trucks, tractor-trailers and construction
equipment, forklifts, pickup trucks and automobiles. When properly operated, this quick change can
be accomplished in as little as ten minutes. The following is the normal sequence of operation for a
CQC-HD. Refer to the “Performing a Quick Change” section of this manual for complete instructions
before operating your unit.
PREPARE FOR THE QUICK CHANGE - A vehicle (with engine still warm to hot) is pulled
into the service area and the CQC-HD is positioned. An appropriate amount of new or recycled coolant
is mixed and then pumped into the CQC-HD fill container. Check the vehicle’s operator manual for
cooling system capacity information. Fill the container with the correct amount of coolant.
USE THE DRAIN PUMP - Waste coolant is removed from the vehicle’s overflow container using
the CQC-HD red suction hose and drain pump.
CONNECTING THE CQC-HD CQC-HD CQC-HD CQC-HD CQC-HD – Remove the upper radiator hose from the neck of the radiator.
The green fill hose attaches to the neck of the radiator and the black drain hose is attached to the
vehicle’s cooling system through the open end of the upper radiator hose. No hose cutting or tees are
required.
PERFORMING THE QUICK CHANGE – Open the fill valve on the green hose. Leave the
drain valve on the black drain hose closed. Turn the fill pump on. The level in the fill container will
drop, then stop dropping. Close the fill valve and stop the fill pump. Open the vehicle thermostat by
starting the engine and raising the RPMs to running speed for 3-5 minutes. Open the drain and fill
valves and start the fill pump. When the amount of clean coolant drops to the predetermined setting of
the coolant system capacity level, the process is complete.
Note: A special bypass loop is connected to the discharge of the fill pump and prevents the over pressurization of
the engine cooling system. A pre-set pressure relief valve in the bypass loop allows coolant to re-circulate back to
the fill container if the thermostat is closed or partially open. The maximum pressure applied to the engine’s cooling
system is 5 psi.
DISCONNECT THE CQC HD – The CQC-HD is disconnected from the vehicle and the vehicle’s
radiator hose is reattached.
TOP OFF - The radiator and overflow bottle are filled to proper levels using the green fill hose and
fill pump. The engine is started to check for leaks.
4.