Sable V6-232 3.8L (1988)
Heater Core: Technical Service Bulletins
Heater Core - Core Leak Test Procedure
HEATER CORE-CORE LEAK TEST PROCEDURE
LEAKS-COOLANT-HEATER CORE LEAK TEST PROCEDURE
Article No. 89-14-9
FORD:
1988-89 CROWN VICTORIA, ESCORT, FESTIVA, MUSTANG, PROBE, TAURUS, TEMPO, THUNDERBIRD
LINCOLN-MERCURY: 1988-89 CONTINENTAL, COUGAR, GRAND MARQUIS, MARK VII, SABLE, TOPAZ, TOWN CAR, TRACER
LIGHT TRUCK:
1988-89 AEROSTAR, BRONCO, BRONCO II, ECONOLINE, F-150, F-250, F-350, RANGER
ISSUE:
Heater cores may be misdiagnosed and replaced unnecessarily. An inadequate seal between the heater core tubes can allow coolant to follow
the tube to the heater core and appear as a leak.
ACTION:
If a heater core leak is suspected, use the following inspection and core leak testing procedure.
INSPECTION
1.
Look for evidence of coolant leakage at the hose to heater core attachments. A coolant leak at the hose could follow the heater core tube to the
core and appear as a leak in the heater core.
2.
Check the system for loose heater hose clamps. The clamps should be tightened to 16-22 in.lbs. (1.8-2.5 N-m).
3.
If leakage is found and the hose clamps are tight, check the heater core tubes for distortion or evidence of being bent out of shape. Severe
distortion of the tubes by such things as over-torqued clamps could cause leakage at the hose connection.
Figure 1
PRESSURE TEST - HEATER CORE IN VEHICLE
1.
Drain the coolant from the cooling system.
2.
Disconnect the heater hoses from the heater core tubes.
3.
Install a short piece of heater hose (approximately 4 inches or 10 cm. long) on each heater core tube.
4.
Prepare the heater core as follows:
a.
Fill the heater core and hoses with water.
b.
Install plug BT-7422-B and adapter BT-7422-A from Rotunda model 021-0012 or equivalent in the hose ends, Figure 1.
c.
Secure the hoses, plug and adapter with hose clamps.
