Advertisement
7-2
COOLING SYSTEM-DIAGNOSIS
Condition
Possible Cause
Correction
(5)
Faulty pressure cap.
(t) Loose or stripped oil cooler fittings.
(5)
Replace pressure cap.
(t) Tighten or replace as necessary.
(a) Install a new head gasket.
(b) Refer to corrections (f), (g), (p),
(q),
(r) and (t)
(c) Pressure test cooling system, replace the cylin-
(d) Pressure test cooling system, replace the cylin-
(e) Pressure test cooling system, replace the cylin-
(f) Pressure test cooling system, replace the cylin-
INTERNAL
LEAKAGE
(a) Faulty head gasket.
(b) Refer to causes (f), (g), (p),
(q),
(r) and (t)
(c) Crack in head into valve compartment.
(d) Cracked valve port.
(e) Crack in block into push rod compartment.
(f) Cracked cylinder wall.
listed under External Leakage.
listed under External Leakage.
der head.
der head.
der block.
POOR CIRCULATION
(a)
(b)
OVERHEATING OR
(a)
ING
(refer to Causes
(c)
listed under "Poor
(dl
Circulation")
(e)
(f)
(9)
(h)
(i)
(i)
(k)
(1)
APARENT OVERHEAT-
(b)
CORROSION
Leaking oil cooler.
der block.
(9) Repair or replace the oil cooler.
Low coolant level.
Collapsed radiator hose. (A bottom hose with
faulty spring may collapse only at medium or
high engine speeds.)
Fan belt glazed, oil soaked, or loose.
(c) Tighten or replace the fan belt as necessary.
Air leak through bottom hose.
(d) Reposition hose clamps or replace the hose.
Faulty thermostat.
(e) Replace the thermostat.
Water pump impeller broken or loose on shaft. (f) Replace the water pump impeller assembly.
Restricted radiator core water passages.
(9) Flush the radiator thoroughly.
Restricted engine water jacket.
(h) Flush the engine cooling system thoroughly.
(a)
Fill
radiator to correct level.
(b) Replace the hose and spring.
Low coolant level.
Blocked radiator air passages.
Incorrect ignition timing.
Low engine oil level.
Incorrect valve timing.
Inaccurate temperature gauge.
Restricted overflow tube.
Faulty radiator pressure cap or seat.
Frozen heat control valve.
Dragging brakes.
Excessive engine idling.
Frozen coolant.
(a)
Fill
radiator to proper level.
(b) Blow out the radiator air passages.
(c) Time the engine ignition system.
(d) Add engine oil to the correct level.
(e) Correct the engine valve timing.
(f) Replace the temperature gauge.
(9) Remove restriction from the overflow tube.
(h) Replace the radiator cap.
(i) Free up the manifold heat control valve.
(i)
Adjust the brakes.
(k) Stop engine.
(I)
Thaw
out
cooling system, add antifreeze as re-
quired.
(m) Faulty fan drive unit.
(m) Replace the fan drive unit.
Faulty temperature sending unit.
( 4
Refer to causes listed under "Poor Circulation
and Overheating."
Overfilling.
(b)
Coolant foaming due to insufficient corrosion
in hibitor.
Air leak at bottom radiator hose.
(dl
Blown head gasket.
(e)
(a)
(c)
Use of water containing large concentration of
(a)
lime and minerals.
Low coolant level.
(b)
Replace
the
sending unit.
Refer to corrections under "Poor Circulation
and Overheating."
Adjust coolant to the correct level.
Flush the radiator and add MoPar antifreeze
or rust inhibitor as required.
Reposition hose clamps or replace the hose.
Replace the head gasket.
Use only clean soft water.
Fill
the cooling system to the correct level.
Hide quick links:
Advertisement
