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Fault finding - cooling and heating systems
2•8 Cooling and heating systems
Overheating
ⅥⅥ Insufficient coolant in system
ⅥⅥ Pump ineffective due to slack drivebelt
ⅥⅥ Radiator blocked either internally or externally
ⅥⅥ Kinked or collapsed hose causing coolant flow restriction
ⅥⅥ Thermostat not working properly
ⅥⅥ Engine out of tune
ⅥⅥ Ignition timing retarded or auto advance malfunction
ⅥⅥ Cylinder head gasket blown
ⅥⅥ Engine not yet run-in
ⅥⅥ Exhaust system partially blocked
ⅥⅥ Engine oil level too low
ⅥⅥ Brakes binding
Engine running too cool
ⅥⅥ Faulty, incorrect or missing thermostat
Loss of coolant
ⅥⅥ Loose hose clips
ⅥⅥ Hoses perished or leaking
ⅥⅥ Radiator leaking
ⅥⅥ Filler/pressure cap defective
ⅥⅥ Blown cylinder head gasket
ⅥⅥ Cracked cylinder block or head
Heater gives insufficient output
ⅥⅥ Engine overcooled (see above)
ⅥⅥ Heater matrix blocked
ⅥⅥ Heater controls maladjusted or broken
ⅥⅥ Heater control valve jammed or otherwise
defective