Finish Thompson CQC-HD User Manual

Page 13

Per

Perfor

for

forming A Quick-Change thr

ming A Quick-Change thr

ming A Quick-Change through the Heater Hose

ough the Heater Hose

Many heavy-duty diesel engines have heater hoses running to and from the engine block below the
thermostat location through a fuel pre-heat exchanger and then on to a cab heater on the firewall. On
many diesel engines these hoses are more accessible than the upper radiator hoses. On this type of
engine configuration, it is possible to conduct the coolant exchange process with the CQ-HD through
these heater hoses. The advantage to this method is that you do not have to have the engine running
to complete the coolant exchange process. Listed below are the steps to conduct a coolant exchange
through the heater hose.

Prepare for Operation

1. Repeat steps 2-4 listed on page 6

2. Pull the vehicle into the service area, in this case it does not have to be warm.

3. Repeat steps 6-8 listed on page 6

4. Locate the heater line between the engine block and the fuel pre-heater

Connecting the CQC-HD to the Heater Hose

6. Loosen the hose clamp that holds the most accessible heater hose (a high point is suggested to

minimize spillage) to its inlet. Use a nut driver, screwdriver or hose pliers (depending upon clamp
type) to loosen the clamp.

7. Remove the heater hose from the connection. Be careful not to damage the connection or hose

while removing.

8. Attach the black drain hose from the CQC-HD to the removed open end of the heater hose by insert-

ing the best fit quick disconnect/step adapter coupling into the heater hose. Using a hose clamp,
seal the heater hose tightly with the “best fit” step on the quick disconnect/step adapter.

HINT

In some cases the size difference between the heater hose and quick disconnect step adapter

may seem too large. It is okay to tighten down the hose clamp to seal up the ¼ inch gap. A worm
gear-type clamp tightened with a nut driver works best.

9. Attach the “best fit” flexible hose adapter to the connection where the heater hose was removed and

secure it tightly using the supplied hose clamp. Be careful not to damage the connection.

10. Attach the green hose from the CQC-HD by inserting the quick disconnect/step adapter into the

open end of the flexible hose adapter. With a hose clamp, seal the flexible hose adapter tightly to
the “best fit” step on the quick disconnect /step adapter.

11.