Grand Cherokee 4WD V8-4.7L (2003)
Fig.13 Heater Core And Tubes - (Typical)
5. Lift the heater core straight up and out of the HVAC housing.
6. When replacing individual tubes, loosen and remove the round tube-to-core clamp, and pull tube from core.
INSTALLATION
WARNING: REVIEW THE WARNINGS AND CAUTIONS IN THE FRONT OF THIS SECTION BEFORE PERFORMING THE
FOLLOWING OPERATION. See: Heating and Air Conditioning/Service Precautions
Any kinks or sharp bends in the refrigerant plumbing will reduce the capacity of the entire air conditioning system. Kinks and sharp bends reduce the
flow of refrigerant in the system. A good rule for the flexible hose refrigerant lines is to keep the radius of all bends at least ten times the diameter of
the hose. In addition, the flexible hose refrigerant lines should be routed so they are at least 80 millimeters (3 inches) from the exhaust manifold.
High pressures are produced in the refrigerant system when the air conditioning compressor is operating. Extreme care must be exercised to make sure
that each of the refrigerant system connections is pressure-tight and leak free. It is a good practice to inspect all flexible hose refrigerant lines at least
once a year to make sure they are in good condition and properly routed.
