Engine distributors DSG-423 - Page 144

DSG-423 COOLING SYSTEM
05-7
Symptom Chart
Refer to the following Diagnosis Chart for cooling system problems, their possible cause and recommended
correction.
CONDITION POSSIBLE SOURCE ACTION
Loss of coolant
• Pressure cap and gasket
• Leakage
• External leakage
• Internal leakage
• Inspect, wash gasket and test. Replace only if
cap will not hold pressure to specification.
• Pressure test system.
• Inspect hose, hose connection, radiator,
edges of cooling system gaskets, core plugs
and drain plugs, transmission oil cooler lines,
water pump, heater system components.
Repair or replace as required.
• Disassembly engine as necessary - check
for:cracked intake manifold, blown head
gaskets, warped head or block gasket
surfaces, cracked cylinder head or engine
block.
Engine Overheats
• Low coolant level
• Loose fan belt
• Pressure cap
• Radiator obstruction
• Closed thermostat
• Fan drive clutch
• Ignition
• Temp gauge or cold light
• Engine
• Coolant mixture
• Fill as required. Check for coolant loss.
• Adjust.
• Test. Replace if necessary.
• Remove bugs, leaves, etc.
• Test, Replace if necessary.
• Test, replace if necessary.
• Check timing and advance. Adjust as
required.
• Check electrical circuits and repair as
required.
• Check water pump, block for blockage.
• 1/2 water and 1/2 permanent anti-freeze
mixture.
Engine fails to
reach normal
operating
temperature
• Open thermostat
• Temperature gauge or cold
light
• Test, replace if necessary.
• Check electrical circuits and repair as
required.